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Comparison of Genes Controlling Race 1 Anthracnose Resistance in Arc and Saranac AR Alfalfa
Author(s) -
Elgin J. H.,
O'Neill N. R.
Publication year - 1988
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/cropsci1988.0011183x002800040020x
Subject(s) - biology , gene , race (biology) , genetics , botany , resistance (ecology) , horticulture , agronomy
Resistance in ‘Arc’ alfalfa, Medicago sativa L., to anthracnose caused by race 1 of Colletotrichum trifolii Bain is conditioned by a single dominant gene, An 1 . A single gene with gene action like An 1 conditions resistance to race 1 anthracnose in ‘Saranac AR’. This tudy was conducted to determine whether or not the gene in Saranac AR coding for resistance to race 1 of C. trifolii is the same An 1 gene operating in Arc. Crosses between three simplex race 1 C. trifolii ‐resistant clones each of Arc and Saranac AR were made, progeny were evaluated for resistance to race 1 of C. trifolii , and susceptible progeny discarded. Resistant progeny were testcrossed to a susceptible male sterile clone. Those progeny whose testcross lines segregated 1:1 were discarded and those that appeared to segregate as a 3:1 or 5:1 were evaluated further. Ultimately the actual segregation ratio was determined to be 5:1, thus indicating the gene in Saranac AR coding for resistance to race 1 of C. trifolii to be the same An 1 gene occurring in Arc.