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Registration of KS108GH5 Glandular‐Haired Alfalfa Germplasm with Multiple Pest Resistance
Author(s) -
Sorensen E. L.,
Horber E. K.,
Stuteville D. L.
Publication year - 1985
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/cropsci1985.0011183x002500060072x
Subject(s) - germplasm , library science , biology , entomology , crop , pest analysis , citation , horticulture , veterinary medicine , botany , agronomy , computer science , medicine
KS108GH5 alfalfa germplasm Reg. no. GP-190 was released by the USDA-ARS, and the Kansas Agricultural Experiment Station in February 1985. It is resistant to the blue alfalfa aphid (Acyrthosiphon kondoi Shinji), pea aphid [Acyrthosiphon pisum (Harris)], spotted alfalfa aphid [Therioaphis maculata (Buckton)], potato leafhopper, Empoascafabae (Harris), anthracnose (caused by Colletotrichum trifolii Bain), and downy mildew (caused by Peronospora trifoliorurn d By). KS108GH5 was derived from the original seed of PI346919, a plant introduction from Russia. It was labeled Medicago glutinosa. Later, Gunn et al. (1) identified it as a mixture of the following Medicago sativa L. subspecies: sativa, praefalcata, glornerata, and X varia. The population was characterized by erect glandular hairs on the seed pods and eglandular vegetative organs. We conducted five cycles of recurrent phenotypic selection for erect glandular hairs on the vegetative parts. Seven percent of the first and 100% of the fifth-cycle plants had erect glandular hairs on the vegetative parts. Hair density varied widely among plants in the KS108GH5 population but plants with a high density of hairs on the vegetative parts were prevalent. Seedling tests to evaluate resistance to the blue alfalfa aphid, pea aphid, spotted alfalfa aphid, and downy mildew were conducted at Manhattan, KS. Percentages of resistance to aphid biotypes in Kansas were: spotted alfalfa aphid—KSI08GH5 = 89, 'Kanza' (resistant control) = 80, 'Ranger' (susceptible control) =10 ; blue alfalfa aphid—KSI08GH5 = 43, 'CUF 101' (resistant control) = 47, 'Buffalo' (susceptible control) = 0; pea aphid— KS108GH5 = 69, Kanza (resistant control) = 56, Ranger (susceptible control) = 0. Germplasm KS108GH5, resistant control 'Saranac', and susceptible control Kanza showed the following percentages of resistant plants in tests with three downy mildew fungus isolates: 15—KS108GH5 = 44, Saranac = 42, Kanza = 2; I7-KS108GH5 = 16, Saranac = 17, Kanza = 0; I8-KS108GH5 = 59, Saranac = 58, Kanza = 1. In an anthracnose (race 1) seedling test at Reno, NV, the percentages of resistant plants were: KS108GH5 = 66, 'Arc' (the resistant control) = 76, and the Saranac (susceptible control) = 10. The KS108GH5 germplasm has not been evaluated for resistance to the potato leafhopper. However, a clone with hair density of 5 per mm on the stem showed no damage by leafhoppers in the field or in growth chambers, while those without hairs were severely damaged. Two grams of KS108GH5 seed are available to each applicant upon written request and agreement to appropriately recognize its source as a matter of open record when this germplasm contributes to the development of a new cultivar or hybrid. Seed stocks of KS108GH5 syn 2 are maintained by the Department of Agronomy, Kansas State University, Manhattan, KS 66506.