Identification of drought tolerant recombinant inbred lines (RILs) based on selection indices in bread wheat

Abstract

Water scarcity throughout wheat-growing periods is a major issue in India, therefore breeding methods, as well as the efficient selection approaches for moisture stress conditions are required to retain the level of crop production. In the current study recombinant inbred lines were developed through a donor, WH 730 crossed with recipient MACS 2496. Further segregating generations were advanced through the single seed descent method at Karnal. The F 7 and F 8 generations of 231 recombinant inbred lines along with five checks were planted in Alpha Lattice design for screening under normal and restricted irrigated conditions. A significant yield reduction was observed under restricted irrigated conditions than the normal irrigated condition during cropping season 2019-20 & 2020-21. Under stress condition significant association was found among yield and selection indices viz., stress susceptibility index (SSI), tolerance index (TOL), mean productivity (MP), stress tolerance index (STI), yield index (YI), drought resistance index (DI), sensitivity drought index (SDI), relative drought index (RDI), yield stability index (YSI) and percentage of yield reduction (PR). Based on selection indices, 22 superior recombinant lines were identified. These selected recombinant inbred lines may be subjected to further evaluation and also incorporated as donor parents in future hybridization programs.

Identification of maintainer and restorer lines based on CMS system for developing hybrid wheat in Egypt

“…Results of the pollen and spikelet fertility percent showed variable fertility reactions for the 75 test crosses Tables (3 & 4). Similar results were reported by Chen and Wehling (2003) and Ahirwar et al (2014) who observed a range of complete fertility to complete sterility observed among several hybrid combinations of wheat. The discovery of complete sterility maintainers and complete fertility restorers within wheat genotypes is important in wheat breeding program because it helps in the use of these genotypes in hybrid development.…”

“…The discovery of complete sterility maintainers and complete fertility restorers within wheat genotypes is important in wheat breeding program because it helps in the use of these genotypes in hybrid development. Ahirwar et al (2014) observed a higher percentage of maintainers and restorers among 130 F1 hybrid wheat. According to these findings, hybrid combinations based on different CMS lines had variable spikelet fertility and pollen fertility.…”

Holistic approach to ascertain genetic variability and responsive trait selection for different heat regimes of central India via field screening of wheat recombinant inbred lines

“…MP3288 and MP3382 two stress‐tolerant checks confirmed by Khare et al. (2022) were included in this study.…”

“…The parents exhibited variation in numerous terminal heat tolerance related traits: grain yield, germination percentage, days to heading, days to maturity, grain filling duration, grain weight per spike, grain number per spike and thousand kernel weight (Gupta et al, 2013;Pandey et al, 2014). MP3288 and MP3382 two stress-tolerant checks confirmed by Khare et al (2022) were included in this study.…”

Abiotic stress tolerance in wheat with emphasis on drought

“…Fluctuating climate is expected to affect various biotic as well as abiotic stresses on wheat (Prasad et al, 2021). The constantly rising temperature of the planet has resulting in water depletion thus limiting the agricultural yield of the crops (Khare et al, 2022). Drought has a very negligible influence on the incidence of kernel filling in wheat, but it does reduce the period between fermentation and maturity, resulting in lowering the dry weight at maturity (Wardlaw and Willenbrink 2000).…”