Combining ability and some genetic parameters for yield and its related traits of rice (Oryza sativa L.) under lysimeter condition

Abstract

Salinity is a major abiotic constraint faced by farmers in many rice-growing regions of the world and improving grain yield in rice is the most important breeding objective. Thirty-five crosses were generated in a line x tester mating design by crossing seven lines with five testers and were evaluated in a randomized complete block design at the greenhouse lysimeter of Rice Research Department, Sakha, Kafr El-Sheikh, Egypt, during the two rice-growing seasons of May, 2021 and 2022. Analysis of variance revealed a highly significant difference among testers and lines for all the studied traits. Variances of specific combining ability were higher in magnitude than the corresponding general combining ability. The lines Sakha 107, Sakha 104, and Giza 182 including testers SAL 010, and CSR 28 were the best general combiners for grain yield plant -1 under saline conditions. The variety Giza 179 followed by Sakha 107 was the best general combiner for 100-grain weight under both normal and saline conditions. Two crosses Giza 179/MTU 1010 and Sakha 107/SAL 010 exhibited highly significant positive estimates of specific combining effects for grain yield plant -1 , respectively. Estimates of narrow sense heritability for all the traits under study were low which indicated a preponderance of non-additive gene action governing these traits. By selecting the appropriate genotypes and phenotypes, the outcomes will be beneficial in breeding salt-tolerant cultivars at both the seedling and reproductive stages.

Studies on Combining Ability and Heterosis for Yield, Its Components and Some Grain Quality Traits in Rice Using Line X Tester Under Normal and Water Deficit

“…So, selection can be postponed to later generation. These findings were in agreement with those of EL-Naem (2010), El-Hity et al, (2015), Abo-Zeid (2016), Daher et al, (2023) and El-Agoury et al, (2023).…”

“…Cross 11 L 236 x GZ 1368-S-5-4 recorded significant negative mid and better parent heterosis for sterility % under normal conditions while, cross IR 6500-127 x GZ 1368-S-5-4 was the best under water deficit conditions. Similar results were reported by several scientists like, El , EL-Keredy et al, (2003), Chitra et al, (2006), Saravanan et al, (2006), El Abd et al, (2007, Ganapathy and Ganesh (2008), Amudha et al, (2010), Daher et al, (2023) and El-Agoury et al, (2023).…”

“…Drought, like many other environmental stresses, has adverse effects on crop yield. Low water availability is one of the major causes for crop yield reductions affecting the majority of the farmed regions around the world El-Agoury et al, (2023). As water resources for agronomic uses become more limiting, the development of drought-tolerant lines becomes increasingly more important Daher (2018), Sedeek et al, (2022) and Shehab et al, (2023).…”