Inheritance of resistance to Zucchini yellow mosaic virus in the interspecific crossCucurbita maxima × C. ecuadorensis

✍ Scribed by Ilan Paran; Chen Shifriss; Benjamin Raccah

• Publisher: Springer
• Year: 1989
• Tongue: English
• Weight: 383 KB
• Volume: 42
• Category: Article
• ISSN: 0014-2336
• DOI: 10.1007/bf00034458

✦ Synopsis

Inheritance of resistance to zucchini yellow mosaic virus (ZYMV) in the interspecific cross Cucurbita maxima x C. ecuadorensis was studied in generations Pl, P2, Fl, F2, BCP1 and BCP2 . The continuous variation presented in these generations implies a quantitative inheritance . The resistance in C. ecuadorensis was partially dominant over that of sensitivity in C . maxima . Several genes with major effects along with genes with minor effects seem to control ZYMV resistance .

Both the dominant and the additive contribution to resistance were found to be significant ; their interaction was also significant . However, the major contribution was due to the additive rather than the dominance effects . The narrow sense heritability is 0 .91 . Virus titer as measured by enzyme linked immunosorbent assay (ELISA) was positively correlated (r = 0 .76) with the intensity of visual symptoms . The efficiency of ELISA as a tool to the breeders, and the use of C . ecuadorensis as a source of resistance to ZYMV are discussed .