Reproductive development in Pisum : the role of genes Sn and Lf

TL;DRAbstract

The influence of the flowering genes Sn/sn and Lfd/Lf/lf/lfa on postinitiation reproductive events in Pisum was examined using pure lines and two specially selected near-isogenic lines in the case of the Sn/sn difference and pure lines and segregating progenies in the case of the Lf series. From a comparison of lines 299+ (Sn, early photoperiodic) and 299- (sn, early day neutral) in short day conditions, it was found that gene Sn slowed the rate of flower bud, pod and seed development, prolonged flower life-span and increased the number of pods per raceme. Sn also promoted vegetative growth by delaying the onset of apical arrest and increasing the tendency to produce lateral branches. The delay in growth of the proximal pod at the first reproductive node remained even when the distal flower was excised at this and all subsequent nodes. The delay was therefore not a consequence of raceme ontogenesis. In contrast, removal of the apical bud immediately above the node bearing the first pod

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