Euphytica (2003) 130, 433-441

Ron Cohen, Aviva Hanan and Harry S. Paris (2003)
Single-gene resistance to powdery mildew in zucchini squash (Cucurbita pepo)
Euphytica 130 (3), 433-441
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 F<sub>2</sub> 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Harry S. Paris

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Podosphaera xanthii	Squash/pumpkin (Cucurbita)