Sandstorms cause shrinkage of Haloxylon ammodendron shrubs and limit their self-renewal

Theoretical and Experimental Plant Physiology - Tập 34 Số 2 - Trang 197-214 - 2022
Shengjun Shi1, Dangwei Zhou1, Fanglin Wang2, Rui Shi3, Tao Sun2, Tiancai Li1, Jialin Ma1, Xiang Wan2, Jian-Ping Ma2, Jing-nian Tang2
1Key Laboratory of Adaptation and Evolution of Plateau Biology, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, No. 23, Xinning Road, Xining, Qinghai, 810001, People's Republic of China
2Gansu Minqin National Station for Desert Steppe Ecosystem Studies, Gansu Desert Control Research Institute, No. 390, Beibinhe West Road, Lanzhou, Gansu, 730070, People's Republic of China
3School of Life Sciences, Sun-Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, Guangdong, 510275, People's Republic of China

Tóm tắt

AbstractHaloxylon ammodendron is an excellent windproof and sand-fixing species whose shrubs are widely cultivated in arid desert areas of northwest China but are now at risk of degradation and shrinkage. Using the chlorophyll fluorescence image analysis technique, the response of photosystem II (PSII) photochemical efficiency and non-photochemical quenching capacity to sediment-carrying wind and sand-free wind (both 12 m s−1) lasting for 10, 20, and 40 min were studied with seedlings in a wind tunnel. The results indicated that the sand-free wind had little influence on the maximum quantum efficiency of PSII photochemistry, Fv/Fm, which was approximately 0.80 on average; however, the Fv/Fm decreased over exposure time in the sediment-carrying wind group, with values smaller than those in the wind-only group. The non-photochemical quenching was sensitive to wind erosion, and sediment-carrying wind could aggravate the reduction in non-photochemical quenching (NPQ). Except for the 10 min duration, the maximum quantum efficiency of PSII photochemistry after dark recovery for 15 min, Fvr/Fmr, was lower in seedlings exposed to sediment-carrying wind than in those in the wind-only group. Compared to wind-only, wind-blown sand led to a water imbalance and withering in seedlings, causing the concentration of photosynthetic pigments (when based on the fresh mass of green branches) to not decrease. With a longer exposure time to sediment-carrying wind, both the probability and extent of lignified spots occurring increased in green assimilative branches. Our results demonstrated that sediment-carrying wind at 12 m s−1 lasting for 20 min or more could cause irreversible damage to the photosynthetic apparatus of H. ammodendron seedlings. Therefore, frequent and strong sandstorms are the main disturbance factors leading to shrinkage of shrubs and limiting their self-renewal.

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Theoretical and Experimental Plant Physiology

Tập 34 Số 2

197-214

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