A tertiary trisomic interchange heterozygote in pea (Pisum sativum L.)

Abstract

In M2 generation of an interchange heterozygote, one off-type plant was isolated which was characterized by the presence of weak and slender stems, with profuse semi-spreading branching, narrow and yellow-green foliage, small and weak pods, and 10 days late-flowering and-maturing as compared to wildtype. The mutant had high pollen and ovule sterility (76-80%) and showed 5II+2II (heteromorphic)+1I (small chromosome) in 85% of the cells. The mutant appeared to be a tertiary trisomic interchange heterozygote. The possible mechanism of the formation of heteromorphic bivalents and a small chromosome are discussed. © 1983 Birkhäuser Verlag.