EI-Shimi,, I., Badr, L., Ghonim, M. (2003). GENE EXPRESSION FOR BIOCHEMICAL MECHANISMAGAINST DOWNY MILDEW DISEASE IN MELON. Journal of Plant Production, 28(10), 7223-7236. doi: 10.21608/jpp.2003.245239
I. Z. EI-Shimi,; L. A. A. Badr; M. I. Ghonim. "GENE EXPRESSION FOR BIOCHEMICAL MECHANISMAGAINST DOWNY MILDEW DISEASE IN MELON". Journal of Plant Production, 28, 10, 2003, 7223-7236. doi: 10.21608/jpp.2003.245239
EI-Shimi,, I., Badr, L., Ghonim, M. (2003). 'GENE EXPRESSION FOR BIOCHEMICAL MECHANISMAGAINST DOWNY MILDEW DISEASE IN MELON', Journal of Plant Production, 28(10), pp. 7223-7236. doi: 10.21608/jpp.2003.245239
EI-Shimi,, I., Badr, L., Ghonim, M. GENE EXPRESSION FOR BIOCHEMICAL MECHANISMAGAINST DOWNY MILDEW DISEASE IN MELON. Journal of Plant Production, 2003; 28(10): 7223-7236. doi: 10.21608/jpp.2003.245239
GENE EXPRESSION FOR BIOCHEMICAL MECHANISMAGAINST DOWNY MILDEW DISEASE IN MELON
Three resistance introduced varieties melon were namely, PI 140471 as p,; PI 124111 as P2 and PI 183227 as P3 were used as (males) with three commercial varieties namely Hale's Best, Honey dew and Ismaelawi (females) as susceptible parents to achieve this investigation during 2001-2002 in the farm of EI-Kassasien Horticulture Research Station.
All the six parental genotypes and their F,'s were evaluated under the artificial infection in open field in complete blocks randomized, with three replicates, to investigate the relationship between peroxidase activity, lignin content, infection severity and the nature of inheritance for this traits and the obtained results can be summarized as following:
Analysis of variance show that, there were highly significant differences for all studied traits.
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Gene expression of infection severity, peroxidase activity and lignification of mean performance for parents and Flhybrids were high.
Additive and non-additive variances has important role in the expression of these traits.
Over dominance was governed the expression of these traits.
Results of general and specific combining ability show that, the best parents for low infection severity and high level of peroxidase activity were PI 140471; PI 183227 then PI 124111 while Ismaelawi was the best parent for lignification, meanwhile the best F, for the above mentioned characters were PI 140471 x tsrnaelawi: PI 183227 x Honey dew while, the F1 PI 140471 x Honey dew exhibited the highest values for lignin content.
These results could be used as markers for selection program for breeding program for resistance against downy mildew in melon.
The artificial infection in early stage of melon plants led to significant depression for average fruit weight, fruit yield per plant and total fruit yield per feddan, while the number of fruits per plants, flesh thickness and total soluble solids did not significantly affected.
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