Scholarlink

<p>Water deficit is a major constraint to wheat productivity, necessitating the identification of genotypes with enhanced physiological resilience and stable yield under stress. The present study aimed to identify potential sources for water deficit tolerance and elucidate the physiological and biochemical mechanisms underlying water deficit tolerance in four introgression lines (ILs: 5U-24, 5U-26, 5U-27 and 5U-31). These ILs were developed from a cross involving a disomic substitution line DS5U<sup>t</sup>(5&#xa0;A) and wheat cultivars Pavon <i>ph1b</i> and WL711. Wheat variety PBW725 was used as check along with ILs, Pavon <i>ph1b</i>, WL711 and DS5U<sup>t</sup>(5&#xa0;A). The experiment was conducted under irrigated and rain-fed (water deficit) conditions and the responses were evaluated at anthesis and 15 days after anthesis. Rain-fed conditions caused a significant (<i>p</i> ≤ 0.05) reduction in grain yield across all genotypes while IL 5U-26 maintained its yield. Thousand-grain weight declined significantly in PBW725, WL711 and IL 5U-31, whereas it increased significantly in ILs 5U-24, 5U-26 and 5U-27. No significant effect was observed in Pavon <i>ph1b</i> and DS5U<sup>t</sup>(5&#xa0;A). All genotypes exhibited osmotic adjustment under water deficit through accumulation of proline, glycine betaine and total soluble sugars. Water deficit stress led to increased hydrogen peroxide and malondialdehyde contents, with comparatively lower accumulation in tolerant genotypes. Stress conditions also reduced relative water content, canopy temperature depression, chlorophyll content and quantum efficiency of PSII, while increasing non-photochemical quenching. These effects were more pronounced in IL 5U-31 and PBW725 at both growth stages. Stem reserve mobilization increased significantly under water deficit, with the highest enhancement observed in IL 5U-26. Principal component analysis indicated that enhanced stem reserve mobilization, higher soluble sugar content, better maintenance of relative water content, chlorophyll content and lower oxidative damage were key contributors to water deficit tolerance. Among the evaluated genotypes, IL 5U-26 exhibited the highest level of tolerance and can act as a potential donor for developing high-yielding, drought-resilient wheat cultivars.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Identifying sources of water deficit tolerance on the basis of physiological and biochemical attributes in wheat introgression lines derived from chromosome 5U of wild wheat Aegilops triuncialis

  • 期刊论文

  • 发表日期：

    2026年7月14日

查看全文
  • Kulveer Kaur,
  • Navita Ghai,
  • Aman Kumar,
  • Satinder Singh,
  • Achla Sharma,
  • Satinder Kaur

摘要

Water deficit is a major constraint to wheat productivity, necessitating the identification of genotypes with enhanced physiological resilience and stable yield under stress. The present study aimed to identify potential sources for water deficit tolerance and elucidate the physiological and biochemical mechanisms underlying water deficit tolerance in four introgression lines (ILs: 5U-24, 5U-26, 5U-27 and 5U-31). These ILs were developed from a cross involving a disomic substitution line DS5Ut(5 A) and wheat cultivars Pavon ph1b and WL711. Wheat variety PBW725 was used as check along with ILs, Pavon ph1b, WL711 and DS5Ut(5 A). The experiment was conducted under irrigated and rain-fed (water deficit) conditions and the responses were evaluated at anthesis and 15 days after anthesis. Rain-fed conditions caused a significant (p ≤ 0.05) reduction in grain yield across all genotypes while IL 5U-26 maintained its yield. Thousand-grain weight declined significantly in PBW725, WL711 and IL 5U-31, whereas it increased significantly in ILs 5U-24, 5U-26 and 5U-27. No significant effect was observed in Pavon ph1b and DS5Ut(5 A). All genotypes exhibited osmotic adjustment under water deficit through accumulation of proline, glycine betaine and total soluble sugars. Water deficit stress led to increased hydrogen peroxide and malondialdehyde contents, with comparatively lower accumulation in tolerant genotypes. Stress conditions also reduced relative water content, canopy temperature depression, chlorophyll content and quantum efficiency of PSII, while increasing non-photochemical quenching. These effects were more pronounced in IL 5U-31 and PBW725 at both growth stages. Stem reserve mobilization increased significantly under water deficit, with the highest enhancement observed in IL 5U-26. Principal component analysis indicated that enhanced stem reserve mobilization, higher soluble sugar content, better maintenance of relative water content, chlorophyll content and lower oxidative damage were key contributors to water deficit tolerance. Among the evaluated genotypes, IL 5U-26 exhibited the highest level of tolerance and can act as a potential donor for developing high-yielding, drought-resilient wheat cultivars.