ORIGINAL_ARTICLE
EFFECT OF HARVESTING DATE, DRYING METHOD, AND STORAGE PERIOD ON THE ESSENTIAL OIL PERCENTAGE AND COMPOSITION OF Aloysia triphylla (L’Her.) Britton LEAVES.
Aloysia triphylla (L’Her.) Britton (Verbenaceae) is an aromatic shrub native to Argentina and Chille; known as herb louisa or lemon verbena. It is an important medicinal and aromatic plant that contains high quality essential oil of lemon scent that has an antifungal activity, and is used as a sedative, antispasmodic, anti diarrhea, and to add flavor to food and beverages. A study was carried out during two successive seasons of 2005/2006 and 2006/2007 at the Experimental Station of Medicinal and Aromatic Plants, Fac. Agric., Mansoura Univ. The research aimed to study the effect of drying method (shade and oven) and the length of storage period (2, 4 and 6 months) on essential oil percentage and composition of the leaves of two harvesting dates (June and September).
The physical and chemical properties of the oil were determined and are included in this study.
The results showed that the oil percentage obtained from September harvest was higher than that of June harvest in both seasons. Shade drying gave the highest oil % followed by oven drying method at 45ْC compared to the fresh leaves. In both June and September cuts, increasing storage period of the dried leaves of lemon verbena decreased the essential oil percentage in both drying methods.
The G.L.C. of the essential oil of the fresh leaves revealed a total of 20 compounds. The total identified compounds constituted 83.5 % and 76.8 % in the oil of shade and oven dried leaves, respectively in June cut, while constituted 87.9 % and 85.9 % in the same order in September oil. The most important compounds in both cuts were 1,8-cineole, geranial, limonene, linalool, and spathulenol and accounted for 49 % of June oil, while summed 54.3 % in September. The method of drying affected the proportion of the oil components in the two cuts.
The relative concentrations of each constituent changed with the length of the storage period. The percentage of some compounds increased (linalool and spathulenol), others decreased (1, 8- cineol, geranial, and limonene), while others changed slightly in their percentages (geranyl acetate and menthone). Some compounds were not present in the oil of June (α-pinene, camphene, citronellal, ocimene, and sabinene), while were present after storage. In September oil, citronellal and curcumene were found in the control, but disappeared after storage.
https://jpp.journals.ekb.eg/article_119154_f05646fc154efb1ee2faec0cce808568.pdf
2009-11-01
10515
10526
10.21608/jpp.2009.119154
H.
Abdel – kader
1
Vegt. and Flor. Dept., Fac. of Agric. Mansoura Univ.
AUTHOR
K.
El-Hindi
2
Vegt. and Flor. Dept., Fac. of Agric. Mansoura Univ.
AUTHOR
Hekmat
Massoud
he-massoud@yahoo.com
3
Vegt. and Flor. Dept., Fac. of Agric. Mansoura Univ.
AUTHOR
R.
Fouda
4
Agri. Botany Dept., Fac. of Agric. Mansoura Univ.
AUTHOR
Fatma
Ibrahim
5
Vegt. and Flor. Dept., Fac. of Agric. Mansoura Univ.
AUTHOR
ORIGINAL_ARTICLE
COMPARATIVE STUDIES ON SIX POMEGRANATE CULTIVARS UNDER BENI – SUEF GOVERNORATE CONDITIONS
The present study was carried out for the comparison of six pomegranate cultivars namely: Manfalouty, Nab El-Gamal, Wardy, Araby, Badr and Tahrir grown at the experimental farm of the Hort. Res. Instit., station at Seds, Beni- Suef Governorate of middle Egypt region during the two growing seasons of 2007 and 2008.The present study included the different polymorphism variances as ; vegetative growth, flowering, yield, fruit quality and rooting ability of the six pomegranate cultivars. In this respect, Manfalouty and Tahrir cultivars were superior in most of vegetative growth characteristics. On the other hand, Badr cv. had the lowest values in most of these growth characteristics. The highest percentage of perfect flowers / tree was recorded for Araby and Tahrir cvs. and the lowest one was for Nab El-Gamal cultivar. Manfalouty and Wardy cvs. gave higher percentage of fruit set while Badr cultivar recorded the lowest values. Moreover, Nab El-Gamal and Manfalouty exhibited the highest yield (kg / tree), fruit weight, length, diameter & volume and juice volume while Badr cv. gave the least ones. The highest percentage of fruit grain was in Tahrir cultivar. As for fruit juice chemical characteristics (total acidity; total soluble sugars; vitamin (c); ascorbic acid; total anthocyanin and tannins), in general, the best cultivars were Manfalouty, Nab El-Gamal, Wardy and Tahrir. Cuttings of Badr and Tahrir cultivars gave the highest rooting percentage with tallest root while Nab El-Gamal had the highest number of roots in both experimental seasons. It is worthy to mention that, it can be recommended with Nab El-Gamal, Manfalouty, Wardy and Tahrir cultivars ( the yield more than 30 kg/tree) to be planted in Beni-Suef Governorate representing the Middle Egypt region and are preferable than Badr and Araby pomegranate cultivars.
https://jpp.journals.ekb.eg/article_119156_6198c5834cdbc61c739d9807dff0aeb7.pdf
2009-11-01
10527
10541
10.21608/jpp.2009.119156
pomegranate
Evaluation
cultivars
Vegetative growth
flowering
yield
fruit quality
cuttings rooting ability
A.
Gowda
1
Olive and Semi Arid Fruits Zone Dep., Hort. Res. Inst., ARC., Giza, Egypt
AUTHOR
I.
Osman
2
Olive and Semi Arid Fruits Zone Dep., Hort. Res. Inst., ARC., Giza, Egypt
AUTHOR
E.
Mikhail
3
Olive and Semi Arid Fruits Zone Dep., Hort. Res. Inst., ARC., Giza, Egypt
AUTHOR
ORIGINAL_ARTICLE
تأثير مستويات ومواعيد مختلفة من التسميد النتروجيني في الغلة الحبية وبعض عناصرها لأصناف من القمح القاسي
نفذ هذا البحث خلال الموسم الزراعي 2009- 2008 في ناحية تلبيسة التي تبعد عن مدينة حمص10 کم شمالاً، وترتفع عن سطح البحر487م، وتقع ضمن منطقة الاستقرار الأولى حيث المعدل السنوي للهطول المطري حوالي(400) مم. زرعت ثلاثة أصناف معتمدة من القمح القاسي (شام3, شام5, أکساد65)، وأضيف السماد النتروجيني (اليوريا 46%) بثلاثة مستويات(40, 80, 120) کغ /الهکتار نتروجين نقي، بحيث أضيف کل مستوى على دفعتين مناصفةً (الأولى بعد اکتمال الإنبات، والثانية في مرحلة الإشطاء) وعلى ثلاثة دفعات متساوية (الأولى بعد اکتمال الإنبات، والثانية في مرحلة الإشطاء، أما الثالثة فکانت في مرحلة بداية الإسبال) بالإضافة إلى الشاهد بدون تسميد. بينت نتائج التحليل الإحصائي تفوق المعاملة (80 کغ /الهکتار نتروجين نقي على دفعتين) على معظم المعاملات المتبقية عند جميع الأصناف بالنسبة للغلة الحبية وأهم عناصرها (وزن الحبوب في السنبلة, عدد الحبوب في السنبلة, وزن الألف حبة, عدد السنيبلات في السنبلة). وکذلک تفوق المعاملة (120 کغ /الهکتار نتروجين نقي على دفعتين) على معظم المعاملات المتبقية بالنسبة لمعامل الإشطاء الإنتاجي . کما أشارت النتائج إلى تفوق الصنف شام5 على أکساد65 بالنسبة للغلة الحبية, کما تفوق شام5 على( شام3 , أکساد65 ) وذلک في کل من الصفات ( وزن الحبوب في السنبلة وعدد الحبوب في السنبلة ووزن الألف حبة وعدد النباتات المتبقية حتى الحصاد)، وتفوق الصنفين شام3 و أکساد65 على شام5 بالنسبة لمعامل الإشطاء الإنتاجي .
https://jpp.journals.ekb.eg/article_119158_965f54c614f7ec0a19a0845c73a2def6.pdf
2009-11-01
10543
10555
10.21608/jpp.2009.119158
مستويات التسميد النتروجيني
مواعيد إضافة السماد النتروجيني
القمح القاسي
الغلة الحبية
عبد الکريم
لقمس
1
قسم المحاصيل الحقلية ، کلية الزراعة ، جامعة البعث ، سورية .
AUTHOR
فيصل
بکور
2
قسم المحاصيل الحقلية ، کلية الزراعة ، جامعة البعث ، سورية .
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF SEEDING RATES, NITROGEN LEVELS AND HARVESTING DATES ON GROWTH, YIELD AND QUALITY OF JUTE (Corchorus capsularis, L.)
This investigation was carried out at the experimental farm of Sakha Agric. Res. Station during 2007 and 2008 seasons to study the effect of three seeding rates at 4, 5 and 6 kg/fed, three nitrogen levels 20, 30 and 40 kg/fed and two harvesting dates i.e., after 120 and 150 days from sowing on growth, yield quantity and quality of U.P.C. 94 jute cultivar. The main findings of the present study could be summarized as follows:
The seeding rate at 5 kg/fed combined with the plant age at 102 days from sowing achieved the highest mean values of dry weight/plant (g), plant height (cm) and leaf area/plant (dm2), while, the leaf area index was in high magnitude by using 6 kg seeds/fed at 72 days old in both seasons. Planting jute with 4 kg/fed at the growth period of 87-102 days from sowing performed the highest average for CGR, RGR and NAR. The maximum contents of chlorophyll A, B and A + B occurred due to the seeding rate of 4 kg/fed at the two plant ages either 55 or 75 days from sowing, as well as, increased number of capsules/plant, seed index, seed yield/plant and fiber yield/plant in both seasons. Whereas, the highest means of capsules zone length, green yield/plant, fiber yield/fed, fiber percentage and fiber strength were obtained by sowing at the rate of 5 kg/fed, while planting with 6 kg/fed accomplished the highest estimates for technical length, fiber length and fiber fineness in both seasons.
There was gradual increase in dry weight/plant due to increasing nitrogen level from 20 up to 40 kg/fed. This trait also increased when plant age increased from 57 to 102 days old, but the maximum estimates of plant height (cm), leaf area/plant (dm2) and leaf area index were obtained due to application of 30 kg N/fed when jute plants reached 102 days from sowing. The more estimates of CGR and NAR were obtained by applying 20 kg N/fed and at the growth period of 87-102 days old, while, the highest RGR was obtained by adding either 30 or 40 kg N/fed and during the growth period of 57-72 days old in both seasons. Gradual increment happened in each of chlorophyll A, B and A + B with increasing nitrogen level at the smallest age i.e., 55 days old. There were gradual increments for each green yield (ton), seed yield (kg) and their components in addition to fiber yield/fed (kg) with increasing N level up to 40 kg/fed, but reduction occurred in fiber percentage and fiber fineness in this case in both seasons.
Delaying harvesting date to 150 days from sowing caused remarkable increase in all studied characters except that of fiber percentage, fiber strength and fiber fineness which were decreased in this case and as compared with the harvesting date of 120 days from sowing.
https://jpp.journals.ekb.eg/article_119160_11d86d82b06c2a49051d54edb427a186.pdf
2009-11-01
10557
10573
10.21608/jpp.2009.119160
Jute
Corchorus capsularis
L
seeding rate
nitrogen fertilizer
harvesting date
Growth
yield
Quality
Eman
El-Kady
1
Fiber Crops Res. Sec., Field Crops Res. Inst., ARC, Egypt
AUTHOR
A.
Abd El-Fatah
2
Fiber Crops Res. Sec., Field Crops Res. Inst., ARC, Egypt
AUTHOR
ORIGINAL_ARTICLE
STUDIES ON SOME MORPHOLOGICAL ASPECTS OF JOJOBA [Simmondsia chinensis (LINK) SCHNEIDER] UNDER EGYPTION CONDITIONS.
Jojoba [Simmondsia chinensis (Link) Schneider] is a long-lived desert shrub, native to the arid zones of Arizona, California and North-Western Mexico. The unique wax in their seeds could be a substitute for the oil of the endangered sperm whale. The plant in its natural habitat tolerates high temperature , soil salinity , soil alkalinity and may classified as a true xerophyte.
Jojoba shrubs has been introduced to Egypt in 1991 and first orchard planted at EL-Ismailia district on nearly 20 feddans by seeds from USA. The total cultivated area of jojoba has reached over 762 feddans that produce 180 tons of seeds according to IJEC (2008).
The study was conducted during seasons of 2006 and 2007 to investigate the variations among different genotypes established by seeds at El-Ismailia to define the extent of differences among them and try to use the morphological parameters obtained in the field for evaluation and propagation of the desirable genotypes.
A total of 24 Jojoba genotypes, among them eleven being considered as commercial genotypes are being morphologically studied. Considerable variability was found among the genotypes in all parameters, i.e. height and volume of shrubs , shoot length , internode length and thickness , number of internodes , number of leaves , average of leaf surface area , leaf area/1m of vegetative growth , shape index of leaf , node density per shoot , flowers density per shoot , seed length and width , weight of 100 seeds in addition to shape index of seed. The natural degree of variability appeared enormous, that gives a plant scientist a huge range of possible gene combinations for future selection and improvement of jojoba as a new-industrial and commercial crop.
https://jpp.journals.ekb.eg/article_119162_cb028fcdd708422f33f56553cd77e38f.pdf
2009-11-01
10575
10568
10.21608/jpp.2009.119162
Jojoba [Simmondsia chinensis (Link) Schneider]
Morphological variation
Evaluation
selection and improvement
E.
El-Baz
1
Faculty of Agriculture, Mansoura University
AUTHOR
E.
EL-Dengawy
2
Faculty of Agriculture, Mansoura University
AUTHOR
S.
El-Shahat
3
Ministry of Agriculture, Egypt
AUTHOR
El.
El-Hassan
4
Ministry of Agriculture, Egypt
AUTHOR
ORIGINAL_ARTICLE
SOME PRE-PLANTING TREATMENTS OF SEED CLOVES AFFECTING ON DRY WEIGHT, YIELD AND BULB QUALITY UNDER DIFFERENT PLANTING DATES
Two field experiments were carried out in sandy loam soil at El-Sofia village (Private Farm), Awlad Sacker, Sharkia Governorate, Egypt on Chinese garlic (Sids-40) during the winter growing seasons of 2006/2007 and 2007/2008. The aim of this study was to study effect of soaking seed cloves in running water for 0, 24, 48 and 72hours, soaking in running water for 0, 24, 48 and 72hours, then stratification of seed cloves in wet Jute for 24 hours and the effect of cold storage of seed cloves at 7˚C for 0, 1, 2 and 3weeks, before planting. The treatments also included the effect of planting date (15th August, 1st September) on plant growth, yield and its components, as well as bulbs and cloves traits. The obtained results showed that plantingdate (1st September) led to significant increases in all tested characteristics of dry weight, total yieldand its components, as well as of bulbs quality. Soaking seed cloves in running water for 24 hours before planting led to significant increases in dry weight, total yield and its components. Moreover quality of bulbs improved compared with the control and the other treatments. Positive interaction between planting dates and soaking, soaking plus stratification and cold storage for seed cloves before planting were often observed.
https://jpp.journals.ekb.eg/article_119165_b71f1cd807999679bd31ab8dfd6f4210.pdf
2009-11-01
10587
10603
10.21608/jpp.2009.119165
garlic (Allium sativum L.)
planting date
stratification
Soaking cloves
Cold storage
S.
El-Seifi
1
Hort. Dept., Fac. Agric., Ismailia, Suez Canal University
AUTHOR
M.
Hassan
2
Hort. Dept., Fac. Agric., Ismailia, Suez Canal University
AUTHOR
Sawsan
Serg
3
Hort. Dept., Fac. Agric., Ismailia, Suez Canal University
AUTHOR
M.
Ali
4
Hort. Dept., Fac. Agric., Ismailia, Suez Canal University
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF IRRIGATION INTERVALS AND SOME APPLIED ANTIOXIDANTS AS WELL AS THEIR INTERACTIONS ON BIOCHEMICAL CONSTITUENTS OF MAIZE PLANT.
Two field experiments were carried out at Tag-El- Ezz Research Station in Dakahlia Governorate, Agric–Res-Center, Ministry of Agric. during 2007 and 2008 seasons to investigate the role of selected antioxidants on mitigate or alleviate the harmful effect of drought stress condition on biochemical constituents of maize plant.
Iirrigation intervals (14, 16, 18 and 20 days) decreased photosynthetic chlorophyll a, b, carotenoids in the leaves of maize plants during the two growing seasons, irrigation every 20 days was the most effective treatment in decreasing photosynthetic pigments.
Concerning the applied antioxidants, it could be showed that each of the applied antioxidants (Citric, ASA or SWE ) increased photosynthetic pigments content in the leaves of both maize during the growing seasons. Moreover, SWE treatment was the most effective in this respect. AS for the interaction effect, it could be show that all applied antioxidants enhanced the contents of photosynthetic pigments under drought stress levels (irrigation every 16, 18, 20 days ) . This is clear when compared with drought stress treatments only but these values were stell under or nearly to control treatment.
As for Endogenous and non-enzymatic antioxidants it could be showed that irrigation intervals treatments and applied antioxidants such as total phenol, proline, ascorbic and glutathione as well as their interactions slightly increased all endogenous enzymatic antioxidants contents as well as SOD, APX and Catalase activities in the shoot of maize plants during the two growing seasons. SWE and irrigation every 20 days were most effective in this respect.
As for N,P ,K contents ,it could be show that drought stress treatments decreased N, P and K contents in leaves and stems of maize plants during the two growing seasons ). Moreover high drought stress level ( irrigation every 20 days ) was the most effective in decreasing N, P, K contents . Contrarily, the data show that applied antioxidants slightly increased N, P , K contents in the different organs of maize plants during the growing seasons. Concerning interaction treatments, it could be show that applied antioxidants enhanced the contents of N, P , K in leaves and stems of maize plants under drought stress treatments (irrigation every 16, 18, 20 days ) compared to the drought stress treatments only. But these increases were less or nearly to the control treatment.
https://jpp.journals.ekb.eg/article_119166_280add545f0c60e60f93b3ddd1f37454.pdf
2009-11-01
10605
10617
10.21608/jpp.2009.119166
M.
Sakr
sakmoheb@yahoo.com
1
Agric., Bot.,Dept.,Agric., Facul.,Mans.,University.
AUTHOR
A.
Gadalla
2
Agric., Bot.,Dept.,Agric., Facul.,Mans.,University.
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF DIFFERENT IRRIGATION INTERVALS,APPLIED ANTIOXIDANTS AS WELL AS THEIR INTERACTIONS ON GROWTH AND YIELD OF MAIZE PLANT.
Increasing irrigation intervals (every 14, 16, 18 or 20 days ), decreased growth parameters as well as yield and its components of maize plants throughout the hole experimental periods during the two growing seasons ( 2007& 2008 ).
Irrigation every 20 days was the most effective treatment in decreasing growth , yield and its component of maize plants.
According to antioxidants, the the results show that applied antioxidants Citric acid, Ascorbic acid or Sea weed extract increased all growth parameters , yield and its components of maize plants.Sea weed extract was the most effective in this respect.
The interaction effect between irrigation intervals and antioxidants substances show that the applied antioxidants enhanced all growth parameter as well as yield and its component of maize under drought stress.
It could be concluded that applied antioxidants could partially counteract the harmful effect of drought stress (irrigation every 16, 18, 20 days ) on growth as well as yield and its component of maize plant .
https://jpp.journals.ekb.eg/article_119168_80aa3a443dbc656a76d9c72eec5e7411.pdf
2009-11-01
10619
10629
10.21608/jpp.2009.119168
M.
Sakr
sakmoheb@yahoo.com
1
Agric. Bot.Dept.Agric. Facul.Mans.University.
AUTHOR
A.
Gadalla
2
Agric. Bot.Dept.Agric. Facul.Mans.University.
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF SPLIT APPLICATION OF NITROGEN AND POTASSIUM TO SK2047 HYBRID RICE
Two field experiments were conduced at Rice Research and TrainingCenter, Sakha Kafr El-Sheikh, Egypt in 2007 and 2008 summer seasons to study the effect of split application of N and K to SK2047 hybrid rice [IR70368A/Giza 178R]. One level of N fertilization was used, 165 kg N/ha in the form of urea applied in three different times (N1) as two splits [2/3 incorporated into dry soil before transplanting + 1/3 before panicle initiation), (N2) as three equal splits [1/3 incorporated into dry soil before transplanting + 1/3 at mid tillering + 1/3 before panicle initiation], (N3) as three splits [1/2 incorporated into dry soil before transplanting + 1/4 at mid-tillering + 1/4 at panicle initiation]. One level of potassium (60 kg K2O/ha) was applied. All amount was applied as follow: (K1) without potassium (control), (K2) the total amount was applied as basal (100% B), (K3) one half as basal and one half at panicle initiation (50% B + 50% PI), (K4) one half as basal and other half in two equal splits; at mid-tillering and at panicle initiation (50% B + 25% T + 25% PI) and (K5) in four equal splits: basal, mid-tillering, panicle initiation and heading (25% B + 25% MT + 25% PI and 25% at heading). The main results could be summarized as follows:
Three equal split applications of nitrogen (N2); [1/3 B + 1/3 MT + 1/3 PI) was superior in dry matter (DM), flag leaf area (FLA), leaf area index (LAI), N and K shoot content, panicle number, % of filled grains/panicle, panicle weight, 1000-grain weight, harvest index (HI) and grain yield.
Potassium applications increased growth characters, grain yield and its components and N and K shoot content compared with the control. While, split-applied potassium with three doses (K4); 50% B + 25% MT + 25% PI, gave the highest values of studied parameters without any significant differences with those produced by (K5); 25% B + 25% MT + 25% PI + 25% heading in rice grain yield.
The interaction between split application of N and K was significant for filled grains percentage and K shoot content in 2007 season.
It could be concluded that for raising hybrid rice productivity, both nitrogen and potassium should be applied in the following formulas; 1/3 basal (B) + 1/3 at mid tillering stage (MT) + 1/3 at panicle initiation (PI) and 50% basal (B) + 25% at mid tillering stage (MT) + 25% at panicle initiation (PI) for nitrogen and potassium respectively.
https://jpp.journals.ekb.eg/article_119170_b124b5d892b2ba0a91b2d8ddbca6b3df.pdf
2009-11-01
10631
10643
10.21608/jpp.2009.119170
R.
Gorgy
1
Agric. Res. Cent., Rice Res. & Training Cent., Sakha, Kafr El-Sheikh, Egypt
AUTHOR
B.
Zayed
basunyz@yahoo.com
2
Agric. Res. Cent., Rice Res. & Training Cent., Sakha, Kafr El-Sheikh, Egypt
AUTHOR
A.
Abou Khalifa
3
Agric. Res. Cent., Rice Res. & Training Cent., Sakha, Kafr El-Sheikh, Egypt
AUTHOR
ORIGINAL_ARTICLE
THE ROLES OF ASCORBIC ACID AND Α-TOCOPHEROL IN MINIMIZE OF SALT-INDUCED WHEAT FLAG LEAF SENESCENCE
Experiments were conducted to study the α-tocopherol and ascorbic acid on modify the leaf senescence process of wheat grown under three salinity levels (0.8, 7.5, and 11.5 dSm-1). The parameters analyzed were soluble protein content, chlorophyll content, electrolyte permeability, ions content, lipid peroxidation, hydrogen peroxide content, catalase and peroxidase activities, ascorbic acid content, phenol, and total carotenoids contents.
Salinity hastened the naturally-occurring senescence rate of wheat flag leaves, it decreased concentrations of chlorophyll, total carotenoids, ascorbic acid, total phenol, calcium, potassium, magnesium, K+/Na+ ratio and soluble protein contents as well as the activities of Catalase and peroxidase. On the other hand, it increased sodium and chloride and chlorophylla:b ratio as well as membrane permeability, hydrogen peroxide content and malondialdehyde content.
Spraying with both antioxidants reduced the hydrogen peroxide accumulation, lipid peroxidation, membrane permeability, sodium and chloride content, whereas the antioxidants enzyme activities (catalase, and peroxidase) were increased. Enhanced accumulation of ascorbate, phenol, carotenoids, calcium, potassium and magnesium was recorded in antioxidants-sprayed plants at 65 days after sowing. Under moderate and sever salinity levels both antioxidants alleviated the harmful effects of salinity on leaf senescence related parameter.
The higher levels of antioxidants (ascorbic acid, phenol, carotenoids) and low level of H2O2 in flag leaf may be the prerequisite for delayed leaf senescence in antioxidants-sprayed plants. It can be concluded that ascorbic acid- sprayed plants can postpone the leaf senescence by peroxide/phenolic/ascorbate system which is involved in scavenging the ROS produced during leaf senescence.
https://jpp.journals.ekb.eg/article_119172_9e3c966bce8a2468ef23b1d08b42b37e.pdf
2009-11-01
10645
10661
10.21608/jpp.2009.119172
antioxidants
Malondialdehyde
salinity
senescence
Wheat
S.
Gadalla
gadalla@mans.edu.eg
1
Agricultural Botany Department, Faculty of Agriculture, Mansoura University, Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
THE ROLE OF ANTIOXIDANTS IN INDUCING WHEAT FLAG LEAF OSMOTIC ADJUSTMENT UNDER SALINITY STRESS
Salt stress up to 11.5 dSm-1 causes a significant reduction in water potential, osmotic potential, as well as relative water content, and water content. On the other hand, turgor potential and osmotic adjustment were significantly increased due to inducing increasing the higher accumulation of compatible osmolytes which leads to decreasing flag leaf area and grain yield per plant. Application of both antioxidants, in particular, ascorbic acid increased significantly flag leaf area, and grain yield per plant due to osmotic adjustment and maintaining leaf turgor potentials as a consequence of increasing leaf water potential, water content and relative water content as compared to control plants. On the other hand, application of both antioxidants under all salinity levels, nullify the harmful effect of salinity effects on flag leaf area and grain yield per plant due to increasing osmolyte accumulation, maintaining turgor potential and osmotic adjustments which in turn increasing flag leaf area and grain yield per plant.
Anatomically, increasing salinity levels decreased thickness of leaf blade at midrib region, thickness of mesophyll tissue, tangential dimension of midrib vascular bundle, thickness of upper epidermis, thickness of lower epidermis, thickness of big motor cell, and tangential dimension of big xylem vessel. Treatment with either ascorbic acid or tocopherol at 100 mg/L and their interactions with salinity increased all the above mentioned parameters in both nonsalinized and salinized plants. Ascorbic acid is the most effective in this concern. In conclusion, wheat plants responded to an increased ion influx in their cells by increasing the osmolytes synthesis and accumulation under salt stress, which further increased with antioxidants treatment and helped in maintaining the osmotic balance.
https://jpp.journals.ekb.eg/article_119173_ef4f1b6bc707185568e2e528b5e425f0.pdf
2009-11-01
10663
10685
10.21608/jpp.2009.119173
ascorbic
Tocopherol
Soil salinity
Growth
yield
Wheat
S.
Gadalla
gadalla@mans.edu.eg
1
Agricultural Botany Department, Faculty of Agriculture, Mansoura University, Egypt.
LEAD_AUTHOR