Effect of genotype and environment on pod wall proportion in white lupin: consequences to seed yield

Abstract

One means of increasing seed yield in white lupin may be the modification of the harvest index in the reproductive compartment by a reduction of the proportion of pod walls. Genetic and environmental effects on the pod wall proportion and yield components were evaluated. Thirty-five genotypes of spring-sown material were sown in 6 different locations across France in 1996 and 1997, accounting for a total of 10 site × year combinations. The existence of a genetic variation for the pod wall proportion among studied genotypes was demonstrated (0.26–0.34). Highly significant genotypic differences for the pod wall proportion, seed number per pod, seed weight per pod, mean seed weight, flowering time, and seed yield were observed among lupin genotypes. The heritability of pod wall proportion was moderate, the phenotypic correlation between this character and seed yield was significant and negative, and the genetic correlation was high and negative. The environmental variance contributed a major part of the total variation. The genotype × environment effect for the pod wall proportion was small, which suggests that the selection of genotypes with low and stable pod wall proportion in different environments will be possible. The strong negative genetic correlation between pod wall proportion and seed yield supports the feasibility of using the character as a selection criterion for a higher seed yield.

Diversity of white and narrow-leafed lupin genotype adaptive response across climatically-contrasting Italian environments and implications for selection

“…However, they suggested that the features of the Mediterranean, conventional-type material (early onset of Xowering, long reproductive phase, high aerial biomass), as well as low proportion of pod wall on pod biomass, were useful in one of these environments without being detrimental in the other. The usefulness of low proportion of pod wall agrees with results reported by Lagunes-Espinoza et al (1999) for a larger set of white lupin genotypes.…”

Strong heritability across years and sites for pod wall proportion and specific weight in Lupinus albus and genotypic correlation with other pod and seed attributes

“…The negative correlation found between PWP and SNP has already been reported (Lagunes‐Espinoza et al. 1999a, Beltran et al.…”

“…The broad sense heritability for PWP reported here is higher than the 0.37 reported by Lagunes‐Espinoza et al. (1999a), who commented that this value might become higher by reducing the error term with an improved sampling strategy.…”

“…2001) and it is confirmed here. Lagunes‐Espinoza et al. (1999a) also reported a negative association between PWP and seed weight per pod, though with coefficients smaller than the ones reported here.…”

“…A reduced pod wall proportion (PWP) may contribute to improving the harvest index of lupins and thus grain yield. Lagunes‐Espinoza et al. (1999a) reported empirical evidence of a strong negative correlation between PWP and grain yield in L. albus , and Clements et al.…”