Single-gene resistance to powdery mildew in zucchini squash (Cucurbita pepo) |
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| Authors: | Ron Cohen Aviva Hanan Harry S Paris |
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| Institution: | (1) Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P.O. Box 1021, Ramat Yishay, 30-095, Israel |
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| Abstract: | Cucurbita pepo (pumpkin, squash,gourd) is an economically important species that is susceptible to the cucurbit powdery mildew fungus, Podosphaera xanthii(syn. Sphaerotheca fuliginea). ‘True French’, an open-pollinated cultivar of the Zucchini Group of C. pepo, was crossed with an unnamed powdery-mildew resistant straight neck-type accession, the resistance of which was apparently
derived from an interspecific cross with a resistant wild species of Cucurbita,and resistant plants were selected in the F2 generation. This was followed by six cycles of backcross-pedigree selection for resistance, and resulted in the development
of an accession true-breeding for resistance to powdery mildew and nearly isogenic to ‘True French’. The resistant and susceptible
near-isogenics were crossed and seeds of the filial and backcross generations were produced. Plants of the parental accessions
and their progenies were grown together in a controlled-environment chamber, exposed to the pathogenic fungus, and scored
as resistant, partially resistant, or susceptible 27–33 days after sowing. The results indicated that resistance is conferred
by a single incompletely dominant gene, designated Pm-0.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | courgette Cucurbita pepo disease resistance genetics Podosphaera xanthii pumpkin Sphaerotheca fuliginea |
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