Effects of drought stress on carbon metabolism of bermudagrass (Cynodon dactylon L.)

Yilong Zhang, Yuxuan Bao, Peiying Li, Qikun Yu, Wen Li, Lisi Tang, Xiaofan Sun, Zongjiu Sun and Shuo Li
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Yilong Zhang: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Yuxuan Bao: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Peiying Li: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Qikun Yu: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Wen Li: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Lisi Tang: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Xiaofan Sun: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Zongjiu Sun: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
Shuo Li: College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China

Plant, Soil and Environment, 2023, vol. 69, issue 6, 269-281

Abstract: The effect of drought stress on carbon metabolism in the leaves and roots of bermudagrass was investigated. Plants established in PVC tubes suffered from three water treatments for 10 days. C138 and Tifway (drought-tolerant) were found to have lower relative electrical conductivity and higher water use efficiency than C32 (drought-sensitive) under moderate drought by increasing carotenoid and soluble sugar content and rapidly decreasing leaf starch content. The sucrose synthase activity of leaves and roots, acid invertase and neutral invertase activity of C32 roots substantially decreased under severe drought, resulting in a slow sucrose decomposition rate and significantly lower fructose and glucose contents than C138 and Tifway. The activities of four carbon metabolism enzymes and sucrose content in the leaves were greater than those in the roots, while the fructose and glucose contents were on the contrary, indicating that bermudagrass transported fructose and glucose obtained from sucrose decomposition from leaves to roots under drought to reduce roots damage. The path analysis indicated that leaves neutral invertase activity, and roots soluble sugar content might be the key parameter of carbon metabolism in bermudagrass under drought.

Keywords: abiotic stress; differences in drought resistance; sucrose metabolism; nonstructural carbohydrate content; irrigation (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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DOI: 10.17221/426/2022-PSE

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