ACTA AGRICULTURAE BOREALI-SINICA ›› 2021, Vol. 36 ›› Issue (2): 99-107. doi: 10.7668/hbnxb.20191627

Special Issue: Rice

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Short-term Submergence on Growth of Rice Seedlings and Activities of Key Nitrogen Metabolism Enzymes in Roots

CHEN Jing1, WANG Chaoyun2, YI Yongjian2, WANG Hongying2, YI Zhenxie1, ZHOU Wanlai1,3   

  1. 1. College of Agronomy, Hunan Agricultural University, Changsha 410128, China;
    2. Institute of Bast Fiber, Chinese Academy of Agricultural Sciences, Changsha 410205, China;
    3. Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China
  • Received:2020-12-10 Published:2021-04-28

Abstract: This study was conducted to research the effects of short-term submergence on soil oxygen concentration and the effects of the biomass, plant height of rice seedlings and the activities of key enzymes of nitrogen metabolism in roots, and explore the physiological mechanism of short-term submergence on rice seedling growth and root nitrogen metabolism. The experiment was carried out under natural light condition in small arched shed and in artificial climate box, respectively. Five treatments were set:non submergence treatment (CK), submergence treatment from one-leaf and one-heart stage to two-leaf and one-heart stage (T1), submergence treatment from two-leaf and one-heart stage to three-leaf and one-heart stage (T3), submergence treatment from three-leaf and one-heart stage to four-leaf and one-heart stage (T3) and submergence treatment in whole process (T4). At the beginning and end of each submergence treatment, the rice seedling biomass, plant height and key enzyme activities of nitrogen metabolism in root were analyzed. The results showed that under flooding conditions, the oxygen concentration in the seedling soil dropped rapidly and approached zero after about 5 hours. After the flooding treatment was removed, with the loss of gravitational water in the soil, the oxygen concentration in the soil was less than 5 hours rapidly increase to atmospheric oxygen concentration state; no matter from which leaf age, the short-term submergence treatment promoted the growth of rice seedlings in a short time, and the fresh weight of shoot and underground root increased compared with the control. The effects of short-term submergence on the activities of key enzymes of nitrogen metabolism were basically the same at different leaf ages, and in most cases, the activities of various nitrogen metabolism enzymes were decreased. The effects of short-term submergence on rice seedlings in different leaf ages were basically the same. However, the effects of short-term submergence before three leaf stage on the activities of nitrogen metabolism enzymes in rice seedling roots were different from those at and after tillering stage.

Key words: Rice, Short-term submergence, Hypoxia stress, Nitrogen metabolism, Enzyme activity

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Cite this article

CHEN Jing, WANG Chaoyun, YI Yongjian, WANG Hongying, YI Zhenxie, ZHOU Wanlai. Effects of Short-term Submergence on Growth of Rice Seedlings and Activities of Key Nitrogen Metabolism Enzymes in Roots[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(2): 99-107. doi: 10.7668/hbnxb.20191627.

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