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<p>A study was conducted to unravel physiological and biochemical mechanisms of drought tolerance in contrasting black pepper genotypes (four tolerant viz. Acc. 4132, Acc. 1343, Acc. 1495, and Acc. 7211 and two susceptible viz. Acc. 5717 and Acc. 4064). The plants were raised in large polythene sacks (90&#xa0;cm height × 60&#xa0;cm width) for two years. Physiological and biochemical observations were recorded after one year of planting, and root traits, yield, and quality attributes were assessed after two years. Principal component analysis (PCA) was performed to identify key traits contributing for drought stress tolerance. Tolerant genotypes showed marginal reductions in RWC, photosynthetic pigments, reducing sugars and ABA, and increased root length, number of roots, and root-to-shoot ratio, proline,and antioxidant enzyme activities. These adaptive responses confirmed improved drought resilience in tolerant genotypes as compared to the susceptible ones. PCA results showed clear variabilityamong the genotypes. PC1 explained 57.89% of the total variation and it was associated mainly with the physiological traits. PC2 contributed 24.39% of the variation and was mainly influenced by total protein, berry number per spike, and number of primary roots. The drought tolerant genotypes displayed higher positive scores for both principal components, whereas susceptible genotypes viz. Acc 5717 and Acc 4064 showed negative scores. Among all the genotypes, Acc 4132 and Acc 1343 showed better physiological and biochemical response and improved yield under drought, suggesting their drought tolerance capability compared to other genotypes.</p>

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Drought tolerance in black pepper (Piper nigrum L.): insight into physiological and biochemical adaptations

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • A. P. Theertha,
  • Dayana Paul,
  • K. S. Krishnamurthy

摘要

A study was conducted to unravel physiological and biochemical mechanisms of drought tolerance in contrasting black pepper genotypes (four tolerant viz. Acc. 4132, Acc. 1343, Acc. 1495, and Acc. 7211 and two susceptible viz. Acc. 5717 and Acc. 4064). The plants were raised in large polythene sacks (90 cm height × 60 cm width) for two years. Physiological and biochemical observations were recorded after one year of planting, and root traits, yield, and quality attributes were assessed after two years. Principal component analysis (PCA) was performed to identify key traits contributing for drought stress tolerance. Tolerant genotypes showed marginal reductions in RWC, photosynthetic pigments, reducing sugars and ABA, and increased root length, number of roots, and root-to-shoot ratio, proline,and antioxidant enzyme activities. These adaptive responses confirmed improved drought resilience in tolerant genotypes as compared to the susceptible ones. PCA results showed clear variabilityamong the genotypes. PC1 explained 57.89% of the total variation and it was associated mainly with the physiological traits. PC2 contributed 24.39% of the variation and was mainly influenced by total protein, berry number per spike, and number of primary roots. The drought tolerant genotypes displayed higher positive scores for both principal components, whereas susceptible genotypes viz. Acc 5717 and Acc 4064 showed negative scores. Among all the genotypes, Acc 4132 and Acc 1343 showed better physiological and biochemical response and improved yield under drought, suggesting their drought tolerance capability compared to other genotypes.