Results of study of polymorphism of <i>Lupinus angustifolius</i> L. spike–like samples from VIR collection on valuable breeding traits

Abstract

The spike-like (epigonal) forms of Lupinus angustifolius L. differ from the typical forms by transformation into pods of the first order branches in the upper part of the plant. There were lines and varieties of narrow-leaved lupine alternately subjected to three-year tests in the climatic conditions of the Moscow region in 2009-2022, as they come into VIR collection. The results of the evaluation of 48 spike-like samples were presented. Of these, a total of 40 non-alkaloid samples were selected. The carriers of the gene le (24 samples) and two genes ta и le (5 samples) were allocated. The morphometric parameters of the samples were characterized in accordance with the descriptor scale. The ranges of variability and coefficients of variation of indicators within the group were shown. The epigonal forms were characterized by weight of seeds in the range of 3.3-9.9 g per plant (on average for three years). The correlation analysis showed that the differences between the samples in the seed productivity were mainly due to differences in the seed size (r...0.51), in the number of pods on the main stem (r...0.53) and in the number of pods on the lateral branches (r...0.54). A negative relationship between the number of pods on the central brush and in the axils (r...–0.70) and between the weight of 1 000 seeds and the average number of seeds per pod (r...–0.55) was noted. The highest indicators of seed productivity had samples k-3062 75A/327 (Australia) and k-3630 B-23/86 (Russia) (9.5 and 9.9 g per plant). The leadership of these samples was due to the outstanding number of seeds per plant (67 and 70) and the number of pods per plant (21.1 and 26.3), including on the main stem (11.4 and 11.1) and on the lateral branches (9.7 and 15.2), as well as by the larger seeds (weight of 1 000 seeds 141 g). Both samples were low-alkaloid, and the sample k–3062 had non-cracking pods by ta and le genes.