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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2022, Vol. 44 ›› Issue (3): 621-631.doi: 10.19802/j.issn.1007-9084.2021069

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Effects of potassium indole butyrate on root morphogenesis and physiological metabolism of soybean under different soil water conditions

Mei-ling LIU1,2(), Nai-jie FENG1,3,2(), Dian-feng ZHENG1,3,2(), Sheng-jie FENG2, Shi-ya WANG2, Hong-tao XIANG4   

  1. 1.College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China
    2.College of Agriculture, Heilongjiang Bayi Agriculture University, Daqing 163319, China
    3.Shenzhen Research Institute of Guangdong Ocean University, Shenzhen 518108, China
    4.Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
  • Received:2021-02-26 Online:2022-06-25 Published:2022-07-04
  • Contact: Nai-jie FENG,Dian-feng ZHENG E-mail:lml19960416@126.com;byndfnj@126.com;zdffnj@163.com;byndfnj@126.com

Abstract:

In this paper, Kenfeng 16 (drought-sensitive) and Hefeng 50 (drought-tolerant) were used as test materials, the potted method was used to study the effects of indole butyrate potassium (IBA-K) seed dressing on root morphogenesis and physiological metabolism of the two varieties of soybean under normal water supply, drought and rewatering conditions. The result showed that compared with normal water supply, drought stress inhibited the growth and development of soybean roots. Dry matter accumulation, morphogenesis, antioxidant enzyme activity and osmotic adjustment substance content of two varieties under IBA-K treatment were higher than their drought control under different soil moisture conditions, reducing the degree of membrane damage. SOD activity, POD activity, soluble sugar and proline content of the two varieties under IBA-K treatment were significantly higher than the drought control under drought conditions, MDA content and relative conductivity were significantly lower than the drought control. Root surface area, average root diameter, root volume, POD activity and CAT activity of the two varieties under IBA-K treatment were higher than their drought control under rewatering conditions, and no significant difference was reached. After rewatering, the dry weight and total root length of Kenfeng 16 roots under IBA-K treatment were significantly increased by 3.13% and 24.51% compared with the drought control, respectively. Dry weight and total root length of Hefeng 50 did not reach significant differences compared with its drought control. The MDA content and relative conductivity of Hefeng 50 under the IBA-K treatment were significantly lower than the drought control by 11.80% and 15.09%, and the SOD activity and soluble sugar content were significantly increased by 14.90% and 3.94% compared with the drought control. The relative conductivity, MDA content, SOD activity and soluble sugar content of Kenfeng 16 did not reach significant differences compared with its drought control. The proline content in the roots of two soybean varieties under IBA-K treatment was significantly increased by 10.62% and 10.70% respectively compared with the drought control. IBA-K treatments and different soil moisture treatments had significant or extremely significant effects on the morphology and physiological indexes of the roots of both varieties, and the interaction between the two had no significant regulatory effect. In summary, IBA-K can reduce the MDA content and relative conductivity by increasing root dry matter accumulation, antioxidant enzyme activity and osmotic adjustment substance content, reducing drought stress on soybean roots at the seedling stage.

Key words: soybean, root system, drought stress, potassium indole butyrate

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