אסיף מאגר המחקר החקלאי

Single-gene resistance to powdery mildew in zucchini squash (Cucurbita pepo)

Year:

2003

Source of publication :

Authors :

Volume :

130

Co-Authors:

Cohen, R., Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P.O. Box 1021, Ramat Yishay 30-095, Israel
Hanan, A., Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P.O. Box 1021, Ramat Yishay 30-095, Israel
Paris, H.S., 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 straightneck-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.

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