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Quantitative Analyses of Inheritance of Resistance to Common Leaf Spot in Alfalfa 1
Author(s) -
Carnahan H. L.,
Graham J. H.,
Newton R. C.
Publication year - 1962
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/cropsci1962.0011183x000200030017x
Subject(s) - agricultural experiment station , inheritance (genetic algorithm) , library science , division (mathematics) , crop , biology , entomology , agriculture , ecology , computer science , mathematics , genetics , arithmetic , gene
COMMON leaf spot, caused by Pseudopeziza medicagims (Lib.) Sacc., is an important disease of alfalfa over much of the extensive area where alfalfa is grown. Selection for improved resistance to this disease is one objective of most alfalfa breeding projects though the inheritance of resistance has not been placed on a factorial basis. In 1953 a study was initiated at the U. S. Regional Pasture Research Laboratory to transfer common leaf spot resistance from a selection which possessed few other desirable characteristics to susceptible genotypes otherwise adapted to Northeastern United States. Later, selection for resistance to yellowing caused by the potato leafhopper, Empoasca fabae (Harris), became a breeding objective. Materials available with promise for resistance to leafhopper yellowing were susceptible to common leaf spot. Therefore, crosses were made among promising clones selected for common leaf spot resistance on the one hand, and clones selected primarily for resistance to leafhopper yellowing on the other hand with the purpose of combin-