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<p>Linseed (<i>Linum usitatissimum </i>L.), commonly called flax, is a crop of industrial importance for oil and seed production. One of the primary cultivation issues it encounters in tropical countries is terminal heat stress, which significantly affects its productivity and the quality of its&#xa0;produce. Consequently, it is essential to identify tolerant sources and breed climate-resilient linseed varieties capable of enduring heat stress during their productive stage. Also, exploring the genetic basis of terminal heat stress response in linseed is crucial to enable effective ways to deal with the stress. In the present study, 50 diverse linseed genotypes were evaluated under field conditions over two consecutive years for their morpho-physiological and biochemical characteristics under normal and late sowing conditions, resulting in terminal heat stress. Heat stress markedly affected growth and physiological characteristics in most genotypes, except RLC 143, Jeevan, EC 852300, EC 852298, Kartika, RLC 148, Himpalam Alsi 2, Lakshmi, and EC 852229, which exhibited little phenotypic alterations in response to high temperature. The cluster and heatmap analysis could classify the tolerant and sensitive genotypes. The principal component and correlation analysis identified the critical yield-determining variables affecting genotype performance under heat stress. Compared to the susceptible ones, the tolerant linseed genotypes exhibited a considerable increase in total soluble sugar, total protein, total phenol, proline, and electrolyte leakage while showing minimal changes in oil content. These tolerant genotypes can serve as promising parental sources for the development of high-yielding and heat-tolerant linseed cultivars, vis-à-vis providing insights into the genetics of terminal heat stress response in flax.</p>

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Characterization of morpho-physiological and biochemical variations in diverse linseed (Linum usitatissimum L.) genotypes reveals terminal heat stress-tolerant accessions for genetic improvement and insights into tolerance studies

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Biswarup Pati,
  • Mainak Barman,
  • Rimpa Kundu,
  • Jhuma Datta,
  • Arpita Das,
  • Dipnarayan Saha,
  • Gouranga Sundar Mandal,
  • A. Anil Kumar,
  • Subhra Mukherjee

摘要

Linseed (Linum usitatissimum L.), commonly called flax, is a crop of industrial importance for oil and seed production. One of the primary cultivation issues it encounters in tropical countries is terminal heat stress, which significantly affects its productivity and the quality of its produce. Consequently, it is essential to identify tolerant sources and breed climate-resilient linseed varieties capable of enduring heat stress during their productive stage. Also, exploring the genetic basis of terminal heat stress response in linseed is crucial to enable effective ways to deal with the stress. In the present study, 50 diverse linseed genotypes were evaluated under field conditions over two consecutive years for their morpho-physiological and biochemical characteristics under normal and late sowing conditions, resulting in terminal heat stress. Heat stress markedly affected growth and physiological characteristics in most genotypes, except RLC 143, Jeevan, EC 852300, EC 852298, Kartika, RLC 148, Himpalam Alsi 2, Lakshmi, and EC 852229, which exhibited little phenotypic alterations in response to high temperature. The cluster and heatmap analysis could classify the tolerant and sensitive genotypes. The principal component and correlation analysis identified the critical yield-determining variables affecting genotype performance under heat stress. Compared to the susceptible ones, the tolerant linseed genotypes exhibited a considerable increase in total soluble sugar, total protein, total phenol, proline, and electrolyte leakage while showing minimal changes in oil content. These tolerant genotypes can serve as promising parental sources for the development of high-yielding and heat-tolerant linseed cultivars, vis-à-vis providing insights into the genetics of terminal heat stress response in flax.