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<p>One of the most important abiotic stressors that severely limits sugarcane yield globally is drought, which also affects plant growth and decrease the crop's industrial productivity. Investigating the responses of sugarcane hybrids under drought conditions through various morpho-physiological traits will aid in the selection of drought-resistant varieties. Twelve morpho-physiological traits differentiated 54 sugarcane hybrids under both normal and drought stress conditions. Three groups based on yield potential in control conditions were constituted to assess the traits change among the groups under stress. Among the hybrids 20–1132(ISH 631) was identified with high/medium yield potential with low/medium reduction, 07–776 (ISH 632) and 04–492 (ISH 633) with less reduction in cane yield and other morpho-physiological traits indicating its drought tolerance potential. Correlation studies showed significant positive association of number of millable canes (NMC), total dry matter (TDM), and single cane weight (SCW) in both environments with cane yield, whereas infrared (IR) and canopy temperature depression (CTD) showed significant negative correlation. Relative water content (RWC) demonstrated a positive correlation with cane yield in drought conditions, highlighting its significance in maintaining water status under stress. Drought indices such as mean productivity, modified stress tolerance index, mean relative performance, relative efficiency index, geometric mean productivity, stress tolerance index, relative decrease in yield, and drought tolerance efficiency differentiated the genotypes and expressed significant correlations with yields in both environments. Biplot study indicated that the first two principal components (PCs) accounted for the majority of the variance of which PC 1 explained 48.06% of the total variability, which was influenced by cane yield, TDM, SCW, and cane height (CH). PC2, explaining 13.46% of the overall variation, was contributed by CTD followed by IR. Drought-tolerant hybrids may be exploited in breeding or molecular programs as donor sources to reveal the genomic regions governing for the drought resistance in sugarcane.</p>

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Assessment of Interspecific Hybrids of Saccharum spp. for Morpho-Physiological Traits and Identification of Drought-Tolerant Genotypes

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • S. Alarmelu,
  • S. Sheelamary,
  • V. Anusheela,
  • R. Arun Kumar,
  • S. Vasantha,
  • Praveen Kona

摘要

One of the most important abiotic stressors that severely limits sugarcane yield globally is drought, which also affects plant growth and decrease the crop's industrial productivity. Investigating the responses of sugarcane hybrids under drought conditions through various morpho-physiological traits will aid in the selection of drought-resistant varieties. Twelve morpho-physiological traits differentiated 54 sugarcane hybrids under both normal and drought stress conditions. Three groups based on yield potential in control conditions were constituted to assess the traits change among the groups under stress. Among the hybrids 20–1132(ISH 631) was identified with high/medium yield potential with low/medium reduction, 07–776 (ISH 632) and 04–492 (ISH 633) with less reduction in cane yield and other morpho-physiological traits indicating its drought tolerance potential. Correlation studies showed significant positive association of number of millable canes (NMC), total dry matter (TDM), and single cane weight (SCW) in both environments with cane yield, whereas infrared (IR) and canopy temperature depression (CTD) showed significant negative correlation. Relative water content (RWC) demonstrated a positive correlation with cane yield in drought conditions, highlighting its significance in maintaining water status under stress. Drought indices such as mean productivity, modified stress tolerance index, mean relative performance, relative efficiency index, geometric mean productivity, stress tolerance index, relative decrease in yield, and drought tolerance efficiency differentiated the genotypes and expressed significant correlations with yields in both environments. Biplot study indicated that the first two principal components (PCs) accounted for the majority of the variance of which PC 1 explained 48.06% of the total variability, which was influenced by cane yield, TDM, SCW, and cane height (CH). PC2, explaining 13.46% of the overall variation, was contributed by CTD followed by IR. Drought-tolerant hybrids may be exploited in breeding or molecular programs as donor sources to reveal the genomic regions governing for the drought resistance in sugarcane.