Effects of sand burial on growth and antioxidant enzyme
activities of wheat (Triticum aestivum L.) in northern China |
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Authors: | Hao Qu HaLin Zhao RuiLian Zhou Jin Li and ChengChen Pan |
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Institution: | 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China 2. School of Life Science, Ludong University, Yantai, Shandong 264025, China 3. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Growth and physiological responses of wheat to sand burial were studied in Horqin Sandy Land, to determine the impact
on productivity and survival as well as antioxidant enzymes responses. This study consisted of one control (no sand) and
four sand burial treatments: 25%, 50%, 75% and 100% of seedling height, respectively. Minor burial (25%) had no effect
on wheat growth and survival; deep burial (100%) was fatal, and the others had an intermediate effect. Thus, the survival
limit to sand burial was equal to seedling height. Sand burial mainly decreased shoot biomass and crop yield, but had small
effects on belowground biomass. Superoxide dismutase (SOD) activity increased with time after burial in all treatments
with surviving plants. Peroxidase (POD) activity increased after six days under burial, and catalase (CAT) activity decreased
after burial, but recovered after 12 days. The concentration of malondialdehyde (MDA), a marker for oxidative
stress, was low on the sixth day, but increased thereafter with burial depth. Thus, sand burial >25% should be avoided due
to growth rate reduction leading to reduced crop yield, and even 25% burial showed physiological indicators of stress. |
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Keywords: | Horqin Sandy Land sand burial wheat Triticum aestivum L survival antioxidant-enzymes |
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