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Further Studies on the Inheritance of a Self‐Compatibility Response to Temperature and the Segregation of S Alleles in Diploid Alsike Clover 1
Author(s) -
Townsend C. E.
Publication year - 1971
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/cropsci1971.0011183x001100060028x
Subject(s) - biology , allele , genotype , genetics , ploidy , gene
Inheritance of a self‐compatibility response to a 32‐C temperature and segregation of S alleles were studied in the F 1 and F 2 progenies of a cross between two temperature‐sensitive I 1 clones of diploid alsike clover ( Trifolium hybridum L.). Temperature sensitivity (T) was inherited on a digenic banffs in the F 1 progeny and was dominant to temperature insensitivity (t). The same two loci controlled temperalure sensitivity in both clones. The S alleles segregated in a l:l:l:l ratio. However, all temperature‐insensitive plants were of one S genotype. Of 10 F 2 progenies evaluated, segregation for temperature sensitivity was 3 T:I t in three progenies, 15 T:I t in five progenies, and 9 T:7 t in one progeny. One progeny with a very high frequency of temperature‐insensitive plants did not fit any acceptable ratio. Segregation ratios for the S allele genotypes were influenced by S allele combinations and individual F 1 parents. The data confirm the previously proposed two.gene model for the inheritance of temperature sensitivity in these two parent clones with an interaction between S allele genotype and temperature sensitivity.