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Flowering gene Ppd in pea: Map position and disturbed segregation of allele ppd-2
journal contributionposted on 2023-05-16, 11:55 authored by Ian MurfetIan Murfet, Taylor, SA
Our results show flowering gene ppd in pea (Pisum sativum L.) is located between branching gene rms3 and isozyme locus Aatp near the IA end of a chromosome now known to include linkage groups IA and II. The ppd locus is about 3 cM from rms3 and 5 cM from Aatp. Two mutant alleles of Ppd are known, ppd-1 and ppd-2. Both mutations result in early flowering and loss of ability to respond to photoperiod. In F2 populations segregating for alleles Ppd and ppd-2 we found a significant deficiency of mutant segregants (on average, half the expected 25%). Reciprocal crosses were made between heterozygous Ppd ppd-2 and homozygous ppd2 ppd-2 plants. Segregation was in accordance with a 1:1 ratio when the hybrid plants were used as the female parent but a significant (P < .0001) deficiency of recessive plants occurred (only 24% were ppd-2) when the hybrid plants were used as the male parent. These results suggest that where Ppd and ppd-2 pollen are in competition there is selection against male gametes carrying the ppd-2 allele. The ppd-1 mutation appears less severe than ppd-2 and segregation for ppd-1 was not significantly disturbed.
Publication titleJournal of Heredity
Department/SchoolSchool of Natural Sciences
PublisherThe American Genetic Association
Place of publicationBuckeytown, MD 21717, USA