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Arid Land Geography ›› 2022, Vol. 45 ›› Issue (3): 879-889.doi: 10.12118/j.issn.1000-6060.2021.406

• Original article • Previous Articles     Next Articles

Response of physiological and biochemical metabolism indices of flax to drought stress and its simulation model

KANG Jia(),LI Yue(),KANG Lianghe   

  1. College of Information Science and Technology, Gansu Agricultural University, Lanzhou 730070, Gansu, China
  • Received:2021-09-09 Revised:2021-10-11 Online:2022-05-25 Published:2022-05-31
  • Contact: Yue LI E-mail:kkangjjia@163.com;liyue@gsau.edu.cn

Abstract:

Drought has been determined to be a stress factor that affects plant growth and development. In this study, we examined how drought stress has damaged agricultural production in northwestern China. Plants use photosynthesis, osmotic metabolism, and antioxidant metabolism indicators to cope with water deficit. To determine the effect of physiological and biochemical metabolic indices of flax on yield in response to drought stress, the pot-water control experiment was used to simulate the flax drought stress. The physiological and biochemical metabolic indices of flax response to drought stress model were constructed, calibrated, and evaluated according to the measured flax yield in Xigongyi Town, Dingxi City, Gansu Province, China, from 2013 to 2014. The fitting degree of the model was determined using root mean square error (RMSE) and the determination of coefficient (R2). The results showed that (1) the RMSE of the simulated yield was 41.3159-155.6685 kg·hm-2, with the average value being 80.1837 kg·hm-2; R2 ranges from 0.8929 to 0.9894, with an average value of 0.9387. The model has a good fitting degree and strong feasibility. (2) Under severe drought stress, the increase in peroxidase (POD) at the final flowering stage (26.09%-28.00%) was deemed to be the largest, and the catalase (CAT) was noted to decrease among the antioxidant metabolic indices (SOD, POD, and CAT). The content of osmoregulation substances increased, with proline increasing the most, as it reached 236.22%. (3) Proline content was positively correlated with chlorophyll content, malondialdehyde content, and CAT. Soluble protein content was positively correlated with malondialdehyde content and CAT. A positive correlation exists between POD and superoxide dismutase (SOD). The physiological and biochemical indices of flax respond to drought stress, and the degree of stress is related to the yield of flax. This model is a scientific supplement to the physiological and biochemical indices of flax response to drought stress and provides a theoretical basis and support for the efficient production management of flax and in the agricultural production system.

Key words: flax, agricultural production systems simulator (APSIM), drought stress, physiology and biochemistry, simulation model