不同土壤水分条件下沙生柽柳（Tamarix taklamakanensis）的生理生化特征及适应性

doi:10.13866/j.azr.2021.01.21

Abstract

Abstract:

Tamarix taklamakanensis is a tree endemic to China and it is the most drought-resistant species in drifting sand dunes within the Tarim Basin. It plays an important role in sand fixation and desert prevention. We selected populations in three different habitats (green belt near the desert road, gravelly desert in riverbed, and drift sand dunes) to quantify the water status, chlorophyll contents, antioxidant enzyme activities, and osmotic adjustment substances contents. We evaluated the species’ physiological and biochemical characteristics in different habitats and its adaptive mechanisms to deal with extreme drought conditions. In soils with low moisture content, superoxide dismutase (SOD) activities, peroxidase (POD) activities, total antioxidant capacity, and soluble protein contents increased, whereas catalase (CAT) and nitrate reductase (NR) activities decreased. In the driest drift sand dune habitat, the population had highest chlorophyll a and soluble sugar contents. Under drought stress, T. taklamakanensis increased SOD and POD activities and total antioxidant capacity, while it decreased CAT and NR activities to maintain the metabolic balance of reactive oxygen. It increased soluble protein, soluble sugar, and malondialdehyde to maintain high osmotic adjustment ability for resisting drought environments.

Key words: Tamarix taklamakanensis, antioxidant enzyme activities, osmotic adjustment substances, ecological adaptability

SU Zhihao,ZHOU Xiaobing,JIANG Xiaolong,WANG Liuqiang,GONG Yanming,KANG Xiaoshan. Physiological and biochemical characteristics and adaptability of Tamarix taklamakanensis in different ecological habitats in the Tarim Basin[J].Arid Zone Research, 2021, 38(1): 198-206.

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References 45

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生境	平均值	土壤深度/cm			叶片相对含水量
生境	平均值	0~20	20~40	40~60	叶片相对含水量
沙漠公路绿化带	25.0±8.4a	10.3±3.4a	35.7±18.1a	29.0±18.5a	59.4±1.3a
河床砾质荒漠	8.2±1.0b	9.3±0.9a	10.3±1.2a	5.0±1.2a	58.8±1.2a
流动沙丘	4.4±1.0b	3.7±2.0a	4.0±2.3a	5.7±1.5a	52.5±1.1b

Physiological and biochemical characteristics and adaptability of Tamarix taklamakanensis in different ecological habitats in the Tarim Basin

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