Physiological response of Kobresia pygmaea to temperature changes on the Qinghai-Tibet Plateau

BMC Plant Biology

Xiaodong Wu¹  Nan Mao²  Shouye Xue²  Guimin Liu²  Zipeng Gan²  Lisha Li²  Bo Zhang²  Xiaoming Li²  Haiyan Xu³ 

[1] Cryosphere Research Station on the Qinghai-Tibet Plateau, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China;School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, China;School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, China;Cryosphere Research Station on the Qinghai-Tibet Plateau, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China;

关键词: Kobresia pygmaea;    Physiological characteristics;    Seasonal changes;    Osmotic adjustment substances;    Antioxidant enzyme activity;   

DOI  :  10.1186/s12870-022-03428-9

来源: Springer

【 摘 要 】

BackgroundThe Qinghai-Tibetan Plateau is experiencing rapid climate warming, which may further affect plant growth. However, little is known about the plant physiological response to climate change.ResultsHere, we select the Kobresia pygmaea, an important perennial Cyperaceae forage, to examine the physiological indices to temperature changes in different growing months. We determined the contents of malondialdehyde, proline, soluble sugars, superoxide dismutase, peroxidation, and catalase activity in leaves and roots of Kobresia pygmaea at 25℃, 10℃, 4℃ and 0℃ from June to September in 2020. The results showed that the content of osmotic adjustment substances in the leaves and roots of Kobresia pygmaea fluctuated greatly with experimental temperature in June and September. The superoxide dismutase activity in the leaves and roots of the four months changed significantly with temperatures. The peroxidation activity in the leaves was higher than that in the roots, while the catalase activity in leaves and roots fluctuates greatly during June, with a relative stable content in other months. Membership function analysis showed that higher temperatures were more harmful to plant leaves, and lower temperatures were more harmful to plant roots. The interaction of organs, growing season and stress temperature significantly affected the physiological indicators.ConclusionsThe physiological indicators of Kobresia pygmaea can actively respond to temperature changes, and high temperature can reduce the stress resistance Kobresia pygmaea. Our findings suggest that the Kobresia pygmaea has high adaptability to climate warming in the future.

【 授权许可】

CC BY