Insights from morpho-physio-biochemical and molecular traits of hot pepper genotypes contrasting for heat tolerance

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Published

2024-03-30

DOI:

https://doi.org/10.58993/ijh/2024.81.1.2

Keywords:

Capsicum annuum L., high temperature tolerance, antioxidant enzymes activity, leaf gas exchange parameters, heat shock proteins (HSP)
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Vol. 81 No. 01 (2024): Indian Journal of Horticulture

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Articles

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Copyright (c) 2024 Indian Journal of Horticulture

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This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Authors

  • Aruna T.S Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Arpita Srivastava Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Bhoopal Singh Tomar Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Anil Khar Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Harikrishna Yadav Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • P.K. Jain Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Renu Pandey Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Shubham Singh Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • T.K. Behera Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India
  • Manisha Mangal Division of Vegetable Science, ICAR-Indian Agricultural Research Institute, New Delhi 110012, Delhi, India

Abstract

The present study compared the morpho-physiological, biochemical, and molecular responses of heattolerant (DLS-161-1) and heat-susceptible (DchBL-240) genotypes of hot pepper under high-temperature conditions. The results showed that DLS-161-1 performed significantly better for various morphological parameters such as plant height (60 cm), number of fruits per plant (180.33), average fruit length (8.40 cm) and leaf parameters. While DChBL-240 has significantly higher malformed seeds per fruit (15.06) and average fruit diameter (12.56 cm). The physiological responses also differed significantly between the two genotypes, with the DLS-161-1 exhibiting higher membrane stability index (65.99%), pollen viability (92.10%), photosynthetic rate (20.73 μmol CO2 m²/sec.), stomatal conductance (0.31 mol H2O m²/sec.), and transpiration rate (8.85 mmol H2O m²/sec). Biochemical analysis revealed significantly increased activity of antioxidant enzymes such as guaiacol peroxidase (564.99 U/g F.W) and catalase (711.90 U/g FW), increased protein content (13.38 mg/g F.W) and reduced malondialdehyde generation (13.42 nmol g-1 FW) in DLS-161-1 compared to heat susceptible genotype (DChBL-240). Further, two of the six heat shock protein genes, CaHSP2271 and CaHSP3, were highly upregulated in the DLS 161-1. The observations suggest that DLS-161-1 could adapt to high-temperature conditions by regulating its morphological, physiological, biochemical and molecular mechanisms.

How to Cite

T.S, A., Srivastava, A., Tomar, B. S., Khar, A., Yadav, H., Jain, P., … Mangal, M. (2024). Insights from morpho-physio-biochemical and molecular traits of hot pepper genotypes contrasting for heat tolerance. Indian Journal of Horticulture, 81(01), 13–18. https://doi.org/10.58993/ijh/2024.81.1.2

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