Differential expression of resistance to powdery mildew incited by race 1 or 2 ofsphaerotheca fuliginea inCucumis melo genotypes at various stages of plant development |
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Authors: | Yigal Cohen Helena Eyal |
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Institution: | 1. Dept. of Life Sciences, Bar-Ilan University, 52900, Ramat Gan, Israel
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Abstract: | Thirty-nine genotypes ofCucumis melo (plant introduction entries, open-pollinated cultivars and F1 hybrids) were evaluated for resistance to powdery mildew under either natural field conditions or artificial inoculation
in growth chambers at the cotyledonary stage and the 2-true-leaf stage. Results confirmed that susceptibility in cotyledons
was not necessarily associated with susceptibility in either true leaves in growth chambers or adult plants in the field.
However, resistance at the 2-true-leaf stage in growth chambers was highly correlated with resistance of field-grown plants.
Results also showed that 20 muskmelon genotypes resistant to race 1 at the cotyledonary stage were also resistant at the 2-leaf-stage
and as adult plants in the field. The same was true for ten genotypes with race 2 inoculations. Because muskmelon genotypes
expressing resistance in cotyledons were also resistant in true leaves in growth chambers or the field, the use of plants
at the cotyledonary stage is recommended for screening for powdery mildew resistance caused by race 1 or race 2 ofS. fuliginea. When cotyledons are susceptible, screening should be done at the 2-true-leaf stage. |
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Keywords: | Melon Cucumis melo powdery mildew Sphaerotheca fuliginea genetics screening for resistance breeding |
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