Flowering and Branching in Lathyrus odoratus L. Environmental and Genetic Effects
, Murfet I.C.
Annals of Botany
, 1985. V. 55. No. 5. P. 715–726
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Three flowering classes were identified amongst Lathyrus odoratus L. cultivars on the basis of response to photoperiod. Class DN is essentially day-neutral and it corresponds to the early (winter) flowering group. Classes LDI and LDH are long day types with an intermediate and high response to photoperiod, respectively. These classes correspond to the Cuthbertson (spring) and late (summer) groups. All classes show a substantial response to vernalization. The classes are most easily distinguished in short day conditions following four weeks of seed vernalization and these conditions were used to examine segregation in crosses between and within classes. The class differences are determined by three allelic genes, dn, Dni, and Dnh, which in homozygous condition give phenotypes DN, LDI and LDH, respectively. Crosses of the type LDH × DN and LDH × LDI gave discrete 3:1 segregations in F2 in terms of either flowering node or days to open flower. However, Dni showed little or no dominance over dn and segregations of the type Dni/dn gave either continuous trimodal distributions or discrete, 3 class segregations in the ratio 1:2:1.The three classes showed marked differences in branching habit which were apparent well before flower initiation. DN segregates seldom produced laterals, LDH segregates branched profusely from the basal nodes while LDI segregates were intermediate in branching tendency. The alleles at the dn locus also influenced dry matter distribution in the shoot, e.g. compared with DN segregates, LDH segregates had smaller apical buds, leaves and main shoots but a greater weight of lateral branches. It is suggested the primary role of the Dnh (Dni) product may be to direct assimilate flow.