Genetic behavior for seed yield and yield components in sesame (Sesamum indicum L.) under normal irrigation and water stress conditions

Abstract

Genetic behavior for seed yield and yield components in sesame (Sesamum indicum L.)under normal irrigation and water stress conditions Comportamiento genético del rendimiento de semillas y componentes del rendimiento en sésamo (Sesamum indicum L.) en condiciones normales de riego y estrés hídrico

Diallel analysis using hayman method to study genetic parameters of yield components in sesame (Sesamum indicum L.)

“…of primary branches per plant, capsule length (cm) and 1000 seed weight (g) indicating the presence of an excess of dominant alleles than recessive alleles. The present findings are in accordance with those of Sedeck and Shafie (2013) [23] , Vekaria et al (2015) [27] , El-Kadar et al (2017) [6] and Ibrahim et al (2021) [12] for seed yield per plant and one or more components in sesame. The information of number of gene/group of gene responsible for particular trait is vital for the genetic progress through selection.…”

“…The value of H1 was greater than H 2 for all the traits (Table 2) indicating that the frequency of gene distribution in the parental lines was unequal and this was also proved by the ratio of H 2 /4H 1 (< 0.25) which confirmed the unbalanced distribution of gene at the loci in the parents implying dominance for all the traits. The results are in accordance with Sedeck and Shafie (2013) [23] , Vekaria et al (2015) [27] and Ibrahim et al (2021) [12] . Mather and Jinks (1971) [19] , while discussing the short comings of numerical component analysis suggested that (H 1 /D)0.5 at each locus is true for major degree of dominance only, where the distribution of dominance and recessive genes is symmetrical.…”

“…The significant H 1 component denotes non-additive (dominance or epistatic) genetic effects, which plays a major role in the inheritance of these traits. This finding is in agreement with the results reported by Sedeck and Shafie (2013) [23] , Aldaji et al (2014) [2] , Vekaria et al (2015) [27] , Tripathy et al (2016a) [25] , El-Kadar et al (2017) [6] and Ibrahim et al (2021) [12] for seed yield per plant and one or more attributes in sesame. Significant values of additive (D) and non-additive components (H 1 and H 2 ) clearly assert the predominance role of both fixable and non-fixable components.…”

“…This suggests that these characters can be easily fixed in early generation. These results are in harmony with those reported by Sedeck and Shafie (2013) [23] , Aldaji et al (2014) [2] , Vekaria et al (2015) [27] , El-Kadar et al (2017) [6] and Ibrahim et al (2021) [12] for seed yield per plant and one or more component traits whereas Tripathy et al (2016b) [26] and Aldaji et al (2015) [1] observed similar result for oil content. The estimates of H 1 and H 2 were significant for all the traits except days to maturity, number of primary branches per plant, capsule length (cm) and 1000 seed weight (g) (Table 2).…”

“…Similar interpretation can be also drown from the mean degree of dominance (>1) for all the traits except days to maturity demonstrating over dominance for most of the traits (Table 2). Similar results were reported by Sedeck and Shafie (2013) [23] , Aldaji et al (2014) [2] , Vekaria et al (2015) [27] , El-Kadar et al (2017) [6] and Ibrahim et al (2021) [12] for seed yield per plant and its contributing traits in sesame. However, as the degree of dominance could be biased due to linkage, epistasis or both the over-dominance observed may not be considered as index of true over-dominance (Comstock and Robinson, 1952).…”