Plant Soil Environ., 2023, 69(6):269-281 | DOI: 10.17221/426/2022-PSE

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

Yilong Zhang1, Yuxuan Bao1, Peiying Li1,2,3, Qikun Yu1, Wen Li1, Lisi Tang1, Xiaofan Sun1, Zongjiu Sun1,2,3, Shuo Li1
1 College of Grassland Science, Xinjiang Agricultural University, Urumqi, P.R. China
2 Key Laboratory of Grassland Resources and Ecology of Xinjiang, Urumqi, P.R. China
3 Key Laboratory of Grassland Resources and Ecology of Western Arid Region, Urumqi, P.R. China

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

Accepted: May 31, 2023; Prepublished online: June 6, 2023; Published: June 28, 2023  Show citation

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Zhang Y, Bao Y, Li P, Yu Q, Li W, Tang L, et al.. Effects of drought stress on carbon metabolism of bermudagrass (Cynodon dactylon L.). Plant Soil Environ. 2023;69(6):269-281. doi: 10.17221/426/2022-PSE.
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