Vol. 10, Issue 1 (2022)
Screening of yield traits and new score indices for improving resilience and productivity in crops under moisture stress: A review
Author(s): Asmat Ara, PA Sofi and ZA Dar
Abstract: Yield has been the primary breeding objective in production breeding and has been improved by targeting yield per se as well as yield components based on correlated response. Direct selection for yield under stress holds promise but is slow on account of complexity of yield. Screening based on yield suffers from low heritability. Selection for drought tolerance typically involves evaluating genotypes for either high yield potential or stable performance under drought stress. Breeding for drought tolerance is very difficult as the stress conditions created in experimental set up and actual field conditions, invariably, have poor correspondence. Plant physiology approaches provide general outlines of plant responses, identifying stress tolerance-related traits or elite cultivars. The new selection method based on water stress indices could help breeders and researchers by defining clear and strong criteria to identify genotypes with high resilience and high productivity and provide a clear visualization of contrasts in terms of grain yield production under stress. A major drawback of using these indices has been lack of correspondence in rankings across indices and their failure to discriminate overlapping responses in terms of yield under stress. There has been substantial effort on part of scientists to develop and validate different indices based on yield per se, index scores, regression analysis as well as various model based approaches. The major focus has been on identifying variables such as phenology, physiological traits, biomass partitioning or other parameters that influence crop performance under stress. The paper appraises the approaches from physiological parameters to yield based indices as well as regression based approaches that have been used to understand crop response to water stress.
Pages: 170-176 | 296 Views 63 Downloads
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How to cite this article:
Asmat Ara, PA Sofi, ZA Dar. Screening of yield traits and new score indices for improving resilience and productivity in crops under moisture stress: A review. Int J Chem Stud 2022;10(1):170-176.
