Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (8): 24-31.doi: 10.13560/j.cnki.biotech.bull.1985.2022-0102

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Research Progress in the Interactions of Strigolactone with Hormones on Regulating Root Growth

SHEN Yue1,2(), TAO Bao-jie1,2, HUA Xia1,2, LV Bing2, LIU Li-jun1, CHEN Yun1,2()   

  1. 1. Jiangsu Key Laboratory of Crop Genetics and Physiology,Yangzhou 225009
    2. College of Bioscience and Biotechnology,Yangzhou University,Yangzhou 225009
  • Received:2022-01-22 Online:2022-08-26 Published:2022-09-14
  • Contact: CHEN Yun E-mail:1459781445@qq.com;yunchen@yzu.edu.cn

Abstract:

As a novel kind of phytohormones of regulating plant root system,strigolactone plays an important role in stimulating the seed germination of parasitic plants,promoting the branching of arbuscular mycorrhizal fungi and regulating the plant shoot branching. The root system is a vital organ for plants to sense the signals of the soil and absorb the nutrients,water and mineral elements,and its development and growth are affected by both external environment and endogenous hormones. Strigolactone inhibits the transportation of auxin and thus increases the size of the meristem and transition zones to regulate the elongation of the primary root,and to suppress the occurrence of the lateral root primordia and the development of the lateral root,which depends on the receptor of cytokinin AHK3. Strigolactone also regulates root hair elongation by promoting the biosynthesis of ethylene,the transportation of auxin and the expression of the auxin receptor TIR1. Here we summarized the structures and functions of strigolactone,as well as its interactions with other hormones such as auxin and cytokinin to regulate the processes of the primary root elongation,lateral root formation and root hair formation and elongation. It is aimed to lay theoretical and practical evidences for further elucidating the regulation mechanism of strigolactone in plant root growth.

Key words: strigolactone, root growth, interactions among hormones