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Gas exchange and chlorophyll fluorescence of four sorghum genotypes under drought stress and rehydratation

Author

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  • František Hnilička

    (Department of Botany and Plant Physiology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • Helena Hniličková

    (Department of Botany and Plant Physiology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • Tomáš Rýgl

    (Department of Botany and Plant Physiology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

Abstract

Water deficit (drought) is an important environmental factor affecting physiological processes in plants. The present work focuses on the study of changes in physiological responses of juvenile plants (plants in the vegetative phase of growth BBCH 14-16) of selected sorghum genotypes Dokok, 30485, Barnard Red and Ruzrok to water deficit and after rehydration. Water deficit affected the observed physiological parameters - gas exchange and chlorophyll fluorescence. Genotypic differences were also confirmed, with Dokok appearing to be the more sensitive genotype and Ruzrok and Barnard Red appearing to be tolerant. Following rehydration, these parameters increased but did not reach the levels of the control plants. A significant decrease in photosynthetic rate (Pn), transpiration (E) and fluorescence compared to the control was found in the water-deficient variant twice for 10 days and 6 days between rehydration periods. Only in the variant where water deficit (14 days) was followed by irrigation (10 days) transpiration increased in genotype 30485. Chlorophyll fluorescence (Fv/Fm) also decreased significantly in this cultivar. The results suggest that a rehydration period of 14 days is insufficient to restore the photosynthetic functions of stressed sorghum plants.

Suggested Citation

  • František Hnilička & Helena Hniličková & Tomáš Rýgl, 2024. "Gas exchange and chlorophyll fluorescence of four sorghum genotypes under drought stress and rehydratation," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 70(9), pages 543-551.
    • Handle: RePEc:caa:jnlpse:v:70:y:2024:i:9:id:292-2024-pse
    DOI: 10.17221/292/2024-PSE
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    References listed on IDEAS

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    1. Allah Wasaya & Sobia Manzoor & Tauqeer Ahmad Yasir & Naeem Sarwar & Khuram Mubeen & Ismail A. Ismail & Ali Raza & Abdul Rehman & Akbar Hossain & Ayman EL Sabagh, 2021. "Evaluation of Fourteen Bread Wheat ( Triticum aestivum L.) Genotypes by Observing Gas Exchange Parameters, Relative Water and Chlorophyll Content, and Yield Attributes under Drought Stress," Sustainability, MDPI, vol. 13(9), pages 1-15, April.
    2. Enrique G de la Riva & Manuel Olmo & Hendrik Poorter & José Luis Ubera & Rafael Villar, 2016. "Leaf Mass per Area (LMA) and Its Relationship with Leaf Structure and Anatomy in 34 Mediterranean Woody Species along a Water Availability Gradient," PLOS ONE, Public Library of Science, vol. 11(2), pages 1-18, February.
    3. Yilong Zhang & Yuxuan Bao & Peiying Li & Qikun Yu & Wen Li & Lisi Tang & Xiaofan Sun & Zongjiu Sun & Shuo Li, 2023. "Effects of drought stress on carbon metabolism of bermudagrass (Cynodon dactylon L.)," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 69(6), pages 269-281.
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