Inbreeding depression in crambe1

Abstract

Inbreeding depression in plants, caused by selfing or crossing among plants with a high degree of relatedness, is a genetic phenomenon that affects quantitative traits. This study aimed at verifying the occurrence of inbreeding depression in crambe progenies originated from selfing, in comparison with open pollination progenies. A randomized blocks design, with three replications, in a 32 x 2 factorial arrangement, with 32 crambe progenies and two reproduction systems (artificial selfing and open pollination), was used. Grain yield, 1,000-grain weight, plant height and final stand were evaluated. A significant interaction was observed between progenies and reproduction systems in all traits evaluated. A reduction in grain yield, 1,000-grain weight and plant height occurred in the majority of the selfing progenies, when compared to open pollination progenies. Inbreeding depression was observed in all traits, especially for grain yield. The heritability coefficients of selfed progenies were higher than the open pollinated ones, except for 1,000-grain weight.

Inbreeding Depression of Progenies of Castor Bean, From of the Variety FCA-PB, Results of Three Types of Pollinations

“…The large variation in levels of depression due to inbreeding had also been reported by Lara-Fioreze et al (2016), in which evaluating the occurrence of depression due to endogamy in crambe progenies, which is also a kind of mixed reproduction mode, originated from self-pollination, in comparison with progenies of free pollination, observed variation in inbreeding depression from -219.0 to 96.2% for the grain yield character, should this variation is related to the allelic frequency of the population which gave origin to the evaluated progenies.…”

Divergence and estimates of genetic parameters in Crambe abyssinica: an oilseed plant for industrial uses

“…This can be explained by the fact that these materials have varied origins and, consequently, present variations that allow greater success in the selection of superior genotypes. Lara-Fioreze et al (2016b) also found high heritability coefficients (> 74.00%) for the traits studied in 32 superior self-progenies of the FMS Brilhante, except for a mass of 1000 grains estimated to be 56.00%.…”