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Effect of Four Recurrent Selection Programs on Two Alfalfa Populations 1
Author(s) -
Hill R. R.,
Hanson C. H.,
Busbice T. H.
Publication year - 1969
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/cropsci1969.0011183x000900030036x
Subject(s) - biology , medicago sativa , selection (genetic algorithm) , aphid , resistance (ecology) , agronomy , pest analysis , verticillium wilt , germ plasm , aphididae , horticulture , plant disease resistance , botany , homoptera , artificial intelligence , computer science , microbiology and biotechnology , biochemistry , gene , embryo
Two broad‐based germ plasm pools of alfalfa, Medicago sativa L, were each subjected to four separate programs of recurrent phenotypic selection for resistance to leafhopper yellowing, caused by Empoasca fabae (Harris); spotted alfalfa aphid, Therioaphis maculata (Buckton); bacterial wilt, caused by Corynebacterium insidiosum (McCull) Jens.; and common leafspot, caused by Pseudopeziza medicaginis (Lib.) Sacc. Selection for resistance to these pests was highly effective. A slight reduction in vigor in the aphid‐resistant populations was attributed to shifs resulting from selection of a small number of plants in the first cycle of that program. Generally, selection for resistance to a particular pest did not cause significant reduction in levels of resistance to other disease and insect pests developed in previous selection programs. Selection of 75 or more plants in each cycle was recommended.