ISHS Acta Horticulturae 510: VII Eucarpia Meeting on Cucurbit Genetics and Breeding
INHERITANCE OF SILVERLEAF RESISTANCE IN CUCURBITA MOSCHATA |
| Author: | L. Wessel-Beaver |
| Keywords: | insect resistance, pumpkins, silverleaf disorder, silver-mottled-leaf, squash, whiteflies |
| DOI: | 10.17660/ActaHortic.2000.510.48 |
| Abstract:
The leaf silvering disorder in Cucurbita is a response to feeding of the immature stage of the silverleaf whitefly, Bemisia argentifolii. Several sources of silverleaf resistance have been identified in C. moschata. Lines resistant and susceptible to silverleaf, along with their F1 and F2 progeny, were field-tested in Juana Diaz, Puerto Rico in 1999, under natural silverleaf whitefly infestation to study the genetic control of resistance. No genetic models could be tested because F1 progenies segregated into both silvered and non-silvered phenotypic classes. However, progenies of resistant × susceptible crosses were generally less resistant to silverleaf than their resistant parent, suggesting partial dominance. Resistant parents tended to have similar effects on their progenies, but susceptible parents exhibited highly variable effects in crosses among themselves and with the resistant parents. Susceptible parents had silver leaf mottling, conferred by gene M, while resistant parents had non-mottled leaves. There may be a relationship between the genetically controlled silver leaf mottling and the expression of the silverleaf disorder. | |
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