Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EFFECT OF BIO-STIMULANT AND SOIL AMENDMENT ON VEGETATIVE GROWTH, YIELD AND FRUIT QUALITY OF Pyrus communis cv. 'LE CONTE' PEAR TREES.197319876476010.21608/jpp.2014.64760ENA. M.ShalanPomology Department, Faculty of Agriculture, Mansoura University, Egypt, 35516.Journal Article20191211The experimental trial was consummated throughout two successive seasons (2012 and 2013) at a commercial orchard at El-Khatatba city, Monifia Governorate, Egypt. It intended to find out the possibility of enhancing "Le Conte" pear trees productivity under local condition in the newly reclaimed lands. Thus, the individual and combined applications of bio-stimulant (EM) and soil amendment (NPK humate) applied as soil drench fourteen times at 2 weeks intervals commencing from first February till mid August to study their effect on vegetative growth, nutrient availability, yield and fruit quality of "Le Conte" pear trees. Results indicated that combined applications of bio-stimulant (EM) and soil amendment (NPK humate) were better than the individual applications, especially at the rate of 200 cm<sup>3 </sup>EM + 75 cm<sup>3</sup> NPK humate/tree/year which showed the best significant effect on various estimated parameters under this study during both seasons.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201BREEDINGTOMATO FOR EARLY BLIGHT RESISTANCE UNDER EGYPTIAN CONDITIONS198920006476210.21608/jpp.2014.64762ENW. A.RamadanHorticulture Research Institute. Agricultural Research Center, (ARC), Giza, EgyptA. A.ElkafrawyPlant Pathology Research Institute, Agricultural Research Center (ARC), Giza, EgyptJournal Article20191211Early blight (EB), caused by fungus <em>Alternaria solani</em> Sorauer, is a destructive disease of tomato (Lycopersicon esculentum Mill.) in Egypt and elsewhere. Sources of genetic resistance have been identified within tomato related wild species, so, the resistance wild accession TL00970 from the AVRDC was crossed with three susceptible varieties (Castle Rock , Super marmande, Floradad) to produce three crosses (TL00970x castle rock ,TL00970 x Super Marmande and TL00970xFloradad ) . The genitors, F1, F2, BC1 and BC2 of the three crosses were used to study the inheritance of resistance <em>Alternaria solani</em> and to estimate the genetic parameters associated with resistance. Mean analysis, the F1 hybrids had severity at the end of epidemic values intermediary between those for the parents susceptible and the parent’s resistant genitors the values were closer to the parent’s susceptible genitors indicates that dominance was predominant over susceptibility, and not for resistance. Also, Mean analysis resulted in a more importance of the genic effect due to dominance, also, both additive, dominance and Epistatic (aa,ad, dd) effects were involved in early blight resistance . The analysis of variance resulted in the estimated additive variance was more important than the variance due to dominance deviations. The estimates of heritability in broad and narrow sense were low, revealed the magnitude of the environmental factors on the total variation. The data revealed that early blight resistance was quantitatively controlled by more than one gene. Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EFFECT OF PLANTING DATES AND SEED TUBER SOURCES ON PRODUCTIVITY OF POTATO IN SIWA OASIS200120166476510.21608/jpp.2014.64765ENS. S.GomaaDepartment of Plant Production, Desert Research Center, Matariya, Cairo, Egypt.Journal Article20191211An experiment was conducted at Siwa Oasis Research Station, Matrooh Governorate, Desert Research Center in two consecutive winter seasons, 2012 and 2013 to determine the effects of four planting dates (1<span style="text-decoration: underline;"><sup>st</sup></span> of Jan., mid of Jan., 1<span style="text-decoration: underline;"><sup>st</sup></span> of Feb. and mid. of Feb.) and three potato seed tuber sources of spunta cultivar (imported certified seed tubers, local seed tubers and recently harvested seed tubers which treated with GA<sub>3</sub> ) on growth and yield under Siwa conditions. The results showed that planting on mid. of Jan. (date2) and 1<span style="text-decoration: underline;"><sup>st</sup></span> of Feb. (date 3) , generally, produced the highest growth and total yield and its components values. On the other hand, 1<span style="text-decoration: underline;"><sup>st</sup></span> of Jan. (date 1) and mid. of Feb. (date 4) gave the lowest values. Base temperature calculation for potato revealed that it was 5.99 <sup>o</sup>C and accumulated heat units above base temperature were 191.56 ± 12.4 degree-days during emergence period.
The results showed , also, that Imported seed tubers (source 1) showed superiority in most studied characters of vegetative growth and yield parameters , followed by local seed tubers (source 2) as compared with recently harvested seed tubers (source 3). Generally, satisfactory characters were obtained when imported seed tubers were planted on mid. of Jan. (date 2) or first of Feb. (date 3) in both two seasons. Highly significant positive correlations were found between yield/fe d. and either yield/plant or average tuber weight. On the contrary, significant negative correlation was found between yield/fed. and number of tuber /plant. Correlation and regression revealed ,also, that increasing number of plant leaves led to increasing of plant fresh weight and average of tuber weight. While increasing number of plant shoots led to increasing number of tubers and decreasing tuber weight.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EFFECT OF CYCOCYL AND CULTAR ON INFESTATION OF CITRUS LEAFMINERS AND CERTAN CHEMICAL CONSTITUENTS OF NAVEL ORANGE LEAVES201720306476610.21608/jpp.2014.64766ENA. M.IbrahimHort., Res., Inst. Agric. Res. Centre. Cairo, EGYPTA. S.Abd ElmaaboudPlant Protection Inst. Agric. Res. Center, Cairo, Egypt.Journal Article20191211Washington Navel orange transplants were sprayed at the beginning of each three growth flushes; i.e., spring, summer and autumn with CCC (cycocyl) or PP<sub>333</sub> (cultar) at 1000 or 2000 ppm. All tested treatments reduced number and percentage of leaf infestation by citrus leafminers (<em>Phyllocnistis citrlla Station</em>). The highest infestation was recorded in summer flush and reduced in in autumn and spring flushes. PP<sup>333 </sup>cultar at 1000 ppm increased leaf pigments content compared with untreated control, while the higher level (2000 ppm) increased the percentages of foliar contents of N, K, Ca and Mg. In addition, the healthy leaves always had higher contents from carbohydrates, pigments, as well as N, P, Ca and Mg than infected ones.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EFFECT OF PICKING DATE ON YIELD AND FRUIT QUAITY OF "WASHIUNGTON NAVEL" ORANGE TREES203120356476910.21608/jpp.2014.64769ENA. M.IbrahemHort., Res., Inst. Agric. Res. Centre. Cairo, EGYPTJournal Article20191211The present investigation was carried out during the two successive of 2009/2010 and 2010/2011 seasons on Washington Navel orange trees grown at El-Shohada farm, El- Menofeia Governorate of Egypt in order to study the effect of five different harvesting date on the yield, fruit quality and successive yield. In the first season, twenty trees were chosen and divided into 5 groups representing 5 Picking dates (treatments). The picking dates were 15 Dec., 15Jan., 15Feb., l5Mar., and 15Apr., Each treatment was replicated times (four trees), in a randomized complete block design, However, in the second season , another trees were chosen and followed the same procedures as in the first season. The yield as number or weight of fruits / tree was recorded for each tree. The results showed that delaying harvest date from 15Dec. to 15April., total yield as number or weight of fruit / tree has decreased. Moreover, fruit creasing percentage, average fruit weight, fruit diameter, peel thickness, were increased with declaring leanest date, however the fruit juice % was decreased.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201INFLUENCE OF PLOUGHING DEPTH, PHOSPHORUS FERTILIZER LEVEL AND THINNING DATE ON SUGAR BEET PRODUCTIVITY AND QUALITY203720456477310.21608/jpp.2014.64773ENM. A.AbdouSugar Crops Research Institute, Agricultural Research Center, Giza, Egypt.N. M. M.AwadSugar Crops Research Institute, Agricultural Research Center, Giza, Egypt.M. E. M.IbrahimSugar Crops Research Institute, Agricultural Research Center, Giza, Egypt.Journal Article20191211This investigation was conducted at El-Manyal Village, Talkha District, Dakahlia Governorate, during 2012/2013 and 2013/2014 seasons to study the effect of ploughing depth (0.0, 10, 20 and 30 cm), phosphorus fertilizer levels (0.0, 15.5 and 31.0 kg P<sub>2</sub>O<sub>5</sub>/fad) and thinning dates (at 20, 30 and 40 days after sowing) on productivity and quality of sugar beet "variety Kawemira". A split-plot design with four replicates was used for each ploughing depth during the two seasons (each ploughing depth was considered as a separate experiment). The main results of this investigation could be summarized as follows:
1- Increasing ploughing depths from 0.0 up to 30 cm significantly increased root fresh weight, root length, total soluble solids percentage (TSS %) as well as root and sugar yields/faddan. On the other hand, it significantly decreased root juice purity percentage in both seasons.
2- Increasing phosphorus fertilizer levels from 0.0 to 15.5 and 31.0 kg P<sub>2</sub>O<sub>5</sub>/fad, significantly increased all studied characters in both seasons.
3- Delaying thinning dates from 20 to 30 and 40 days after sowing markedly decreased all studied characters, except root diameter in both seasons.
4- The interactions among studied factors showed insignificant effects, except for the effect of the interaction between ploughing depth and phosphors fertilizer levels on root length in the first season and sugar yield/fad in the second season.
Increasing ploughing depth to be 30 cm, adding 31.0 kg P<sub>2</sub>O<sub>5</sub>/fad and thinning at the age of 20 days was the suitable recommendation to maximize sugar beet root yield and quality under the environmental conditions of Dakahlia Governorate.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EVALUATION OF SOME MICRONUTRIENTS ROLE ON SUGAR BEET PRODUCTIVITY AND QUALITY204720566477710.21608/jpp.2014.64777ENM. A.AbdouSugar Crops Research Institute, Agricultural Research Center, Giza, Egypt.H. M.SarhanSugar Crops Research Institute, Agricultural Research Center, Giza, Egypt.A. A. A.MohamedAgronomy Department- Faculty of Agriculture- Kafrelsheikh University- Egypt.Journal Article20191211Two field trials were carried out at El-Manyal Village, Talkha District, Dakahlia Governorate during 2012/2013 and 2013/2014 seasons to evaluate the role of three micronutrients "iron (Fe) at the rate of 0, 250 and 500 ppm, zinc (Zn) at the rate of 0, 100 and 200 ppm and boron (B)" at the rate of 0, 100 and 200 ppm on productivity and quality of sugar beet, cv. "Kawemira". A split-split plot design with four replicates was used in these experiments.The main results could be summarized as follows:
1- Raising iron (Fe) rates from 0.0 to 500 ppm (0.0 to 200 g/fad.), significantly increased all studied characters over both seasons, except for the percentages of root sucrose and root juice apparent purity in both seasons, where it significantly decreased root juice apparent purity in the first season, while it resulted in insignificant effects on the percentages of root sucrose in both seasons and the percentage of root juice apparent purity in the second season.
2- Raising zinc (Zn) concentrations from 0.0 to 200 ppm (0.0 to 40 and 80 g/fad.) resulted in gradual significant increases in all studied characters over the two seasons, except for root juice apparent purity %, which was significantly decreased in the first season, while it was insignificantly decreased in the second season.
3- Raising boron (B) concentrations from 0.0 to 100 and 200 ppm (0.0 to 40 and 80 g/fad), markedly increased all studied characters over both seasons, except root juice apparent purity %, which was insignificantly decreased in both seasons.
4- Root length (cm) and sugar yield (t/fad) were significantly affected by the interaction between the concentrations of both iron (Fe) and zinc (Zn) in the second season.
Generally, it could be concluded that spraying beet plants with iron (Fe) at rate of 200 g/fad. and 80 g/fad. of each one of zinc (Zn) and boron (B) is the suitable conclusion to maximize its productivity and quality under the environmental conditions of Dakahlia Governorate.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201PRODUCTIVITY AND QUALITY OF SUGAR BEET AS AFFECTED BY PLANT DISTRIBUTION PATTERN AND NITROGEN FERTILIZER LEVEL205720686484510.21608/jpp.2014.64845ENM. A.AbdouSugar Crops Research Institute- Agricultural Research Center -Giza, Egypt.Dalia I. H.El-GeddawySugar Crops Research Institute- Agricultural Research Center -Giza, Egypt.A. M.ElwanSugar Crops Research Institute- Agricultural Research Center -Giza, Egypt.Journal Article20191212Two field trials were conducted during 2012/2013 and 2013/2014 seasons at El-Manyal Village, Talkha District, Dakahlia Governorate, to study the effect of plant distribution sowing patterns and nitrogen fertilizer levels on yield and quality of sugar beet, "cv. Kawemira". The obtained results indicate that:
1- Sowing distribution patterns had significant effects on all studied characters over the two seasons, except for root diameter in the second season The studied sowing patterns(28, 24 and 20 or 35, 30 and 25 cm between hills in the two sides of terrace (mastaba) led to significant differences on the most of the studied characteristics in both seasons. Sowing beet seeds in both sides of terrace 80 cm width at 25 cm distance between hills led to significant increase in yields of roots, gross sugar and white sugar (t/fad) as well as the percentage of the extractable white sugar.
2- Increasing nitrogen fertilizer levels from 80 to 100 and 120 kg N/fad, significantly increased root fresh weight (g), root diameter, sugar loss percentage, the yields of root, gross sugar, white sugar and lost sugar/fad in both seasons besides root length (cm) in the second season. On the other side, it significantly decreased root gross sugar and extractable white sugar percentages in both seasons.
Generally, it could be concluded that sowing sugar beet seeds at 25 cm apart between hills on the two sides of terrace (mastaba) 80 cm width and adding 120 kg N/fad is recommended to maximize its productivity and quality under the environmental conditions of Dakahlia Governorate. Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201GROWTH, YIELD AND FRUIT QUALITY OF EGGPLANT (Solanum melongena L.) AS AFFECTED BY IRRIGATION INTERVALS AND FOLIAR APPLICATION OF SOME ANTITRANSPIRANTS.206920836484610.21608/jpp.2014.64846ENM. K. A.RakhaSelf Pollinated Vegetable Crops Research Department, Hort. Res. Inst. Agric. Res. Center, Giza, Egypt.Journal Article20191212For facing acute problem of fresh water scarcity in the future to face the increasing population problem and also for cultivating newly reclaimed lands. So, two field experiments were conducted in the open field at farm Meat Salseil near Mansoura, City Dakahlia Governorate, Egypt during two successive early summer seasons of 2012 and 2013 on clay loam soil to investigate the effect of two treatments of irrigation intervals (10 and 20 days) and four treatments of foliar application from antitranspirants (control, Kaolin, Potassium silicate and dyriton ) as well as their interactions on growth, fruit quality, yield and its components of eggplant (<em>Solanum melomgena</em> L.) c.v Black Beauty. The experimental design was a split plot, where irrigation intervals were in the main plots and antitranspirants source allocated in the sub plots in a randomized complete block design with three replications.
<strong>The results obtained from this work could be summarized as follow:</strong>
The effect of interaction between irrigation intervals and foliar antitranspirants had significant effect on all plant growth parameters during both seasons.
The foliar application of antitranspirants, significantly enhance fruit quality compared with control treatment except acidity in the 1st season. As soon as spraying dyriton (4 %) under short irrigation intervals (10 days) recorded the highest values of T.S.S % and V.C.
Also, the obtained results showed that application of antitranspirants were significantly increased on the most of yield parameters. The highest values were recorded with sprayed dyriton 4 % compared with the other treatments.
The interaction between irrigation intervals (10 and 20 days) and different foliar antitranspirants caused an increment on the most mentioned parameters of yield during both seasons.
Generally, it could be concluded that the importance of determine the interactive effects between irrigation intervals and antitranspirants, to find out the optimum combinations for maximum early, total yield and fruit quality. It was found that irrigation intervals under 10 days with 4 % dyriton sprayed as antitranspirants, had the best combination and it is recommended for eggplant grown under similar field condition in order to get higher economical yield.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201PARTIAL ALLEVIATION OF THE ADVERSE EFFECTS OF SALT STRESS ON Zea mays L. SEEDLINGS BY ACETYL SALICYLIC ACID (ASPIRIN).208520916484710.21608/jpp.2014.64847ENM. A.WasfiDept.of Botany, Faculty of Science, Khartoum Univ. ,SudanE. O.Abdel RahmanDept.of Botany, Faculty of Science, Khartoum Univ. ,SudanJournal Article20191212Sodium chloride salinity (60 mM) caused reduction of nitrates in the roots and leaves of<em>Zeamays</em> relative to control by 18% and 62% respectively. Foliar application of acetyl salicylic acid (5 mM) partially mitigated the adverse effects of salinity on the content of the ion. Nitrate reductase activity was also negatively affected by the salinity treatment and decreased by 81% and 29% in the roots and leaves respectively. Supplements of aspirin partially alleviated the activity and soluble sugars behaved similarly.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201GENETIC VARIANCE REVEALED IN COWPEA BY PARTIAL DIALLEL AND FACTORIAL MATING DESIGNS209321036484810.21608/jpp.2014.64848ENEl. A.AmeenHorticulture Research Institute. Agricultural Research Center, (ARC), Giza, EgyptW. A.RamadanHorticulture Research Institute. Agricultural Research Center, (ARC), Giza, EgyptA. Y.ElsayedHorticulture Research Institute. Agricultural Research Center, (ARC), Giza, EgyptJournal Article20191212Genetic variability and heritability are two important factors for plant improvement programs where the magnificence and type of this variability determine the selection criteria to be used by the breeder. This study aimed to estimate the genetic components associated with variance and covariance based on partial diallel crosses and factorial mating designs, as well as, to identify the association between yield components and other quantitative traits to extend an orientation for selection. Six cowpea varieties were used in this study. All possible crosses were done according to partial diallel mating design in addition to the F<sub>1</sub> hybrid which were arranged in a factorial mating design. The parents, F<sub>1</sub> and their F<sub>2</sub> generations were evaluated in a field trial experiments at El-Baramon station, Dakahlia Governerate, in a randomized complete blocks design with four replicaties. The results revealed that both two mating designs were suitable to study the genetic parameters. The means of F<sub>1 </sub>hybrids exceeded the mid parents (MP) and the better parent (BP). Significant values of heterosis were obtained for all studied traits. The highest values were 43.84% for pod length versus MP and 15.68% for number of pods per plant versus BP. The magnitude of both additive and non-additive genetic variances were high that means the possibility to development inbred lines of cowpea through selection. The higher values of broad-sense and narrow-sense heritability indicating good genetic variability for effective selection. The following traits; pod length, pod weight, weight of 100-seeds, and number of seeds per pod could be considered in breeding for grain yield, as they contribute significantly to its improvement.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EFFECT OF REMEDIAL AND AMENDMENTS USES ON SOME BOTANICAL CHARACTRISTICS AND YIELD OF PEA AND sunflower PLANTS Pisum sativum L. and Helianthus annus L.210521286484910.21608/jpp.2014.64849ENF. A. A.El-EmaryDept. of Agric. Botany, Fac. of Agric., Assiut, Al-Azhar Univ. Egypt.N. I. A.TalhaSoils, Water and Environ. Res. Inst.Sakha Agric., Res. Station, Egypt.Journal Article20191212Two field experiments were carried out at Sakha Experimental Station, Kafr El-Sheikh Governorate during the two growing seasons, of 2012 and 2013 The effects ofsewage sludge (SS), poultry manure (PM), processed town refuse (PTR), mixture of SS and PM,recommended rates of NPK, mineral fertilizers (RMF<span style="text-decoration: underline;">)</span> without or with gypsum, or sulphur, on the certain Botanical characteristics and yield of pea plants were studied. In addition, the residual effects on the yield and its components of sunflower plants were investigated. Remedial andamendments were incorporated into the plowing soil (0-15 cm) before planting pea plants.
<strong>The obtained data can be summarized as follows:</strong>
<strong>1-</strong>D.W and Seed index were markedly increased by increasing the biosolids application rate. The application of SS<sub>5</sub> (without) agrochemicals, PM<sub>2</sub> with gypsum and PM<sub>2</sub> with sulphur produced the highest Dry weight.
<strong>2-</strong>Concentration of plastid pigments in the pea leaves were increased due to the application of <strong>(</strong>SS<sub>5</sub><strong>) </strong>and sulphur<strong> .</strong> Addition of remedial with or without agrochemicals increased, N, P, K, Cu, Mn, Zn. Heavy metals, Cd, Pb and Ni contents of straw were also increased compared with the control but less than the toxic limits for these plants.
<strong>3-</strong>SS<sub>5</sub>, without; (SS+PM)<sub>3</sub> and with gypsum and PM2 with sulphur increased seed yield if compared to control. The application of SS<sub>5</sub> without agrochemicals, PM<sub>2</sub> with gypsum and PM<sub>2</sub> with sulphur produced the highest straw yield.
The residual effects due to remedial and amendments treatments showed that:-
<strong>4-</strong>Plant height; D.W were increased due to pre-incorporated (SS+PM)<sub>3</sub>. Similarly, stem and head diameter recorded, highest values by PM<sub>2</sub> gypsum and sulphur in a descending order.
<strong>5-</strong>Plastid pigments Macro, Micro and Heavy metals, were also increased. The highest values plastid pigments were obtained in sulphur-sewage sludge pre-treated soils at the high levels. At the same time N, P and K content of different sunflower plants organs were higher in SS<sub>5</sub>, (SS+PM)3 and PM2 respectively, in soil than those obtained in low rate of organic manure treatments.
<strong>6-</strong>The highest seed oil yield was obtained due to (PM<sub>2</sub> and SS<sub>3</sub>) without application.
<strong>It could be concluded that </strong>remedial and amendments, i.e, SS<sub>5</sub>, (without); PM2(with gypsum) and PM2 (with sulphur) have a significant influence on Botanical characteristics and yield of pea plants. Their residual effects extends to best botanical characteristics and yield of sunflower plantsunder the experimental condition.Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201INHERITANCE OF RESISTANCE AGAINST PHYTOPHTHORA INFESTANS Inlycopersicon pimpenellifolium L3708212921406485110.21608/jpp.2014.64851ENW. A.RamadanHorticulture Research Institute, Agricultural Research Center, (ARC), Giza, Egypt.S. M.KamelPlant Pathology Research Institute, Agricultural Research Center, (ARC), Giza, Egypt.Journal Article20191212<span>In Egypt, no commercial tomato (<em>Lycopersicon esculentum</em> Mill.) varieties are available which are resistant to the late blight, one of the most important tomato diseases, caused by the phytopathogenic oomycete <em>Phytophthora infestans</em>. The wild tomato (<em>Lycopersicon pimpenellifolium</em>) shows resistance to <em>P. infestans</em>. So, in this investigation an interspecific cross between <em>L.esculentum</em> cv. Castle Rock and <em>L. pimpenellifolium</em> accession L3708 from the AVRDC were made. The genitors, F<sub>1</sub>, F<sub>2</sub>, BC<sub>1</sub> and BC<sub>2</sub> were used to study the inheritance of resistance to <em>P. infestans</em> and to estimate the genetic parameters associated with resistance. The resistance to <em>P. infestans</em> is controlled polygenic ally. The analysis of variances and genetic parameters suggested that this type of resistance was inherited quantitatively, and dominance was predominant over susceptibility, and not for resistance, that would be more interesting. The data supported the hypothesis that race-non-specific resistance in <em>L. pimpenellifolium</em>L3708 is controlled by partially-dominant and dominant epistatic effects. The heritability in broad (H<sub>b.s</sub>%) and narrow sense (H<sub>n.s</sub> %) estimates were 73.28 and 26.86% for severity revealed the magnitude of the environmental factors on the total variation. The dominance gene effects were quire important in the inheritance of resistance to <em>P. infestans</em>. Estimates of additive gene effects were of low, magnitude. Epistatic gene effects were considered to be more important than the additive gene effects in the inheritance of resistance to <em>P. infestans</em> in the cross under study. The additive x additive, additive x dominance and dominance x dominance gene effects were highly significant. The reciprocal recurrent selection breeding is the best method to improve the resistance to <em>P. infestans.</em></span>Mansoura University, Faculty of AgricultureJournal of Plant Production2090-366951220141201EFFECT OF WATER PRIMING DURATION ON RICE (Oryza sativa L.) GERMINATION AND SEEDLING GROWTH UNDER ISO-OSMOTIC SOLUTIONS OF NACL AND PEG.214121576485310.21608/jpp.2014.64853ENM. A.KhafagyDepartment of Agricultural Botany, Faculty of Agriculture, Mansoura University,M. M.DarowishDepartment of Agricultural Botany, Faculty of Agriculture, Mansoura University,S. M.SalamaDepartment of Agricultural Botany, Faculty of Agriculture, Mansoura University,El-Shimaa A. M.Abo-El-KheerDepartment of Agricultural Botany, Faculty of Agriculture, Mansoura University,Journal Article20191212Two factorial experiments were conducted to study the effect of grain priming tretmenton two rice cultivars namely, Sakha 101 and Giza 178 on germination indices under salinity (NaCl) or draught (PEG) condition at the same water potentials, The treatments were done 4 times of hydro-priming 12, 24, 36 and 48 h. The osmotic potential levels of 0.0, -4, -8 and -12 bar were induced by NaCl or PEG-6000. The results showed that hydro-priming for 48 h caused significant improvement of germination indices under water stress condition in comparison with other priming treatments. Also NaCl or PEG, in general, inhibited the germination process as reflected by a decrease in the germination percentage, root and shoot lengths as well as fresh and dry weight. The studied rice cultivars Sakha 101 and Giza 178 and the reduction was significantly higher in Sakha101 compared to Giza178. It could be concluded that Giza 178 proved to be more tolerant against drought and salt stress conditions than Sakha 101. In addition, germination process and seedling growth may be enhanced by priming rice grains in water for48 h.