Scholarlink

<p>Salinity is a major abiotic constraint limiting growth, physiological performance, and yield stability in guar (<i>Cyamopsis tetragonoloba</i> L.), an important industrial legume cultivated across arid and semi-arid regions. The present field study evaluated fifteen guar genotypes originating from Iran, India, and Pakistan under three salinity levels (0, 10, and 15 dS m<sup>− 1</sup>) in a factorial RCBD design. Salinity imposed highly significant reductions in relative chlorophyll content, relative water content, leaf area, plant height, root length, and all reproductive traits, while markedly increasing CO₂ concentration, electrolyte leakage, MDA accumulation, and proline content. Genotypes differed widely in their sensitivity, and strong genotype × salinity interactions were observed for most traits, particularly chlorophyll stability, water status, oxidative stress indicators, phenological delays, and seed and gum yields. Seed yield and gum yield, respectively were declined by 25.1 and 43.9% at 15 dS/m (<i>p</i> &lt; 0.001). Among the evaluated genotypes, RGC-986 (genotype 1) consistently displayed superior performance across salinity levels, maintaining the highest relative chlorophyll content, leaf area, seed number per plant, 100-seed weight, gum percentage, and final seed yield. In contrast, Pishen (genotype 15) was the most adversely affected, exhibiting sharp declines in morphological attributes, delayed phenology, and substantial reductions in reproductive output at high salinity. Stress-tolerance indices (STI, GMP, YSI, HMP) further confirmed the strong salt-tolerant behavior of genotypes RGC-986 (G1) (STI = 1.0), S6673 (G2), BR-99 (G3) and Saravan (G10), while genotypes RGC-1066 (G14) and Pishen (G15) ranked among the most susceptible (STI = 0.63). Overall, the study demonstrated substantial genetic variability in guar responses to salinity and highlighted key physiological traits such chlorophyll retention, osmotic adjustment, membrane stability, and growth maintenance as essential determinants of tolerance. Genotypes identified as salt-tolerant represent valuable candidates for breeding programs and for sustainable guar cultivation in salinity-affected regions.</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

Evaluation of salt stress indices and morpho-physiological attributes to identify high-yielding, salt-tolerant guar (Cyamopsis tetragonoloba L.) genotypes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月22日

查看全文
  • Mohammed R. Najm,
  • Khawlah Mahmood Al Nooh,
  • Omar Ahmed Fathi Al-Rubaie,
  • Samara Saad Younus,
  • Ali M. Saadi,
  • Heidar Meftahizade

摘要

Salinity is a major abiotic constraint limiting growth, physiological performance, and yield stability in guar (Cyamopsis tetragonoloba L.), an important industrial legume cultivated across arid and semi-arid regions. The present field study evaluated fifteen guar genotypes originating from Iran, India, and Pakistan under three salinity levels (0, 10, and 15 dS m− 1) in a factorial RCBD design. Salinity imposed highly significant reductions in relative chlorophyll content, relative water content, leaf area, plant height, root length, and all reproductive traits, while markedly increasing CO₂ concentration, electrolyte leakage, MDA accumulation, and proline content. Genotypes differed widely in their sensitivity, and strong genotype × salinity interactions were observed for most traits, particularly chlorophyll stability, water status, oxidative stress indicators, phenological delays, and seed and gum yields. Seed yield and gum yield, respectively were declined by 25.1 and 43.9% at 15 dS/m (p < 0.001). Among the evaluated genotypes, RGC-986 (genotype 1) consistently displayed superior performance across salinity levels, maintaining the highest relative chlorophyll content, leaf area, seed number per plant, 100-seed weight, gum percentage, and final seed yield. In contrast, Pishen (genotype 15) was the most adversely affected, exhibiting sharp declines in morphological attributes, delayed phenology, and substantial reductions in reproductive output at high salinity. Stress-tolerance indices (STI, GMP, YSI, HMP) further confirmed the strong salt-tolerant behavior of genotypes RGC-986 (G1) (STI = 1.0), S6673 (G2), BR-99 (G3) and Saravan (G10), while genotypes RGC-1066 (G14) and Pishen (G15) ranked among the most susceptible (STI = 0.63). Overall, the study demonstrated substantial genetic variability in guar responses to salinity and highlighted key physiological traits such chlorophyll retention, osmotic adjustment, membrane stability, and growth maintenance as essential determinants of tolerance. Genotypes identified as salt-tolerant represent valuable candidates for breeding programs and for sustainable guar cultivation in salinity-affected regions.