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<p>Drought is one of the major environmental constraints limiting plant growth and development. The current investigation used polyethylene glycol (PEG 5 and 10%) to screen twenty-two fodder sorghum genotypes for drought stress compared to distilled water as a control. After 48, 72, 96 and 108&#xa0;h (h) of sowing, the germination percentage (G %) was observed, and an analysis of variance (ANOVA) revealed that G % significantly (<i>p</i> &lt; 0.05) decreased in 10% PEG treatment. The decrease in the seedling length (SL) with drought stress intensity were observed after 5, 7 and 9&#xa0;days of germination. Different genotypes had different root–shoot ratios, and were reduced significantly when subjected to 10% PEG treatment. Likewise, PEG treatment decreased the relative water content (RWC), seedling biomass (SB) and seedling vigor index (SVI) of 9-day-old seedlings significantly. The α-amylase activity had increased from 0.15 to 0.26&#xa0;mg maltose g<sup>−1</sup>&#xa0;h<sup>−1</sup> FW when measured 24 and 48&#xa0;h after seeding, respectively. However, average activity was decreased from 0.32 to 0.20&#xa0;mg maltose g<sup>−1</sup>&#xa0;h<sup>−1</sup> FW under 10% PEG treatment after 48&#xa0;h of sowing. The heat map revealed a strong and positive correlation (<i>p</i> &lt; 0.05) between the final germination percentage (FGP) and SVI, as well as SL and SVI. Genotypes (IC-0285908, IC-0287137, IC-0409422, IC-0409429, IC-0253658, and IG-02-382) having high-stress tolerance index value (STI &gt; 70) are grouped into high drought tolerant categories. The identified genotypes from this study can be used in future drought stress breeding programs and for the identification of genomic region(s) governing drought tolerance in sorghum. </p>

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Seedling growth responses of fodder sorghum [Sorghum bicolor (L.) Moench] genotypes under drought stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月16日

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  • Yogesh Khokhar,
  • I. Indu,
  • Shahid Ahmed,
  • Maneet Rana,
  • Mahendra Singh,
  • Sultan Singh,
  • Nilamani Dikshit,
  • Subhash Chand,
  • Rajesh Kumar Singhal

摘要

Drought is one of the major environmental constraints limiting plant growth and development. The current investigation used polyethylene glycol (PEG 5 and 10%) to screen twenty-two fodder sorghum genotypes for drought stress compared to distilled water as a control. After 48, 72, 96 and 108 h (h) of sowing, the germination percentage (G %) was observed, and an analysis of variance (ANOVA) revealed that G % significantly (p < 0.05) decreased in 10% PEG treatment. The decrease in the seedling length (SL) with drought stress intensity were observed after 5, 7 and 9 days of germination. Different genotypes had different root–shoot ratios, and were reduced significantly when subjected to 10% PEG treatment. Likewise, PEG treatment decreased the relative water content (RWC), seedling biomass (SB) and seedling vigor index (SVI) of 9-day-old seedlings significantly. The α-amylase activity had increased from 0.15 to 0.26 mg maltose g−1 h−1 FW when measured 24 and 48 h after seeding, respectively. However, average activity was decreased from 0.32 to 0.20 mg maltose g−1 h−1 FW under 10% PEG treatment after 48 h of sowing. The heat map revealed a strong and positive correlation (p < 0.05) between the final germination percentage (FGP) and SVI, as well as SL and SVI. Genotypes (IC-0285908, IC-0287137, IC-0409422, IC-0409429, IC-0253658, and IG-02-382) having high-stress tolerance index value (STI > 70) are grouped into high drought tolerant categories. The identified genotypes from this study can be used in future drought stress breeding programs and for the identification of genomic region(s) governing drought tolerance in sorghum.