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Registration of UC 332 very Nondormant Alfalfa Germplasm with High Resistance to Fusarium Wilt and Phytophthora Root Rot
Author(s) -
Lehman W. F.,
Marble V. L.
Publication year - 1992
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1992.0011183x003200010073x
Subject(s) - biology , germplasm , root rot , fusarium wilt , phytophthora , resistance (ecology) , fusarium oxysporum , horticulture , agronomy , phycomycetes , botany , inoculation
UC 222 and UC 263 originated from a wide, very nondormant germplasm base maintained by the University of California alfalfa breeding program at El Centra, CA. Parent plants for these germplasms were selected from seedling tests in the greenhouse, and from a large walk-in insect cage, where high numbers of blue alfalfa aphid were maintained over a 2-wk period. UC 222 (one cycle of selection) and UC 263 (two cycles of selection) were derived from 107 and 109 parent plants, respectively, planted in cages and intercrossed with honeybee (Apis mellifera L.) as pollen vectors, at the Imperial Valley Agricultural Center near El Centra, CA. Seedling tests to evaluate resistance to the blue alfalfa aphid were conducted at Tucson, AZ. Percent resistant plants were 75, 56, and 0.7 for UC 222, 'CUF 101' (R) (1) (2), and 'Caliverde' (S), respectively. In another trial, percent resistant plants to the blue alfalfa aphid were 88, 58, and 0 for UC 263, CUF 101 (R), and Caliverde (S), respectively. Ten grams of seed of UC 222 and UC 263 will be distributed, until depleted, upon written request and agreement to make appropriate recognition of their sources as a matter of open record when these germplasms contribute to the development of new cultivars, hybrids, or germplasms. Requests for seed should be sent to Mr. Larry Gibbs, University of California, 1004 E. Holton Rd., El Centra, CA 92243.