Research Progressing in Signals and Molecular Mechanisms of Plant Growth-Promoting Rhizobacteria to Regulate Plant Root Development

doi:10.13560/j.cnki.biotech.bull.1985.2020-0997

Abstract

Abstract: Plant growth-promoting rhizobacteria（PGPRs）play essential roles in plant growth and health,they are the major source of microbial fertilizers,and contribute significantly to the reduction of chemical fertilizer input and green development of agriculture. PGPRs promote plant growth and improve nutrients use efficiency through two central mechanisms：activating rhizosphere nutrients and improving root development. Rhizosphere colonization of PGPRs can regulate the root system architecture（RSA）,affecting the elongation of the primary root and promoting the formation of lateral roots and root hairs. PGPRs secrete phytohormones to be involved in the root development directly,and some signal molecules to regulate RSA indirectly mediated by the plant endogenous molecular pathways. PGPRs have various effects on plant RSA,many novel signals secrete from PGPRs to affect plant RSA,and their regulating mechanisms are required to be explored,which may be used to form the ideal RSAs for different crops to increase nutrient use efficiency. Finally,these studies will enhance the contribution of PGPRs to the reduction of chemical fertilizers input and the green development of agriculture. This paper reviewed the identified phytohormones and signals secreted by PGPRs,summarized their molecular mechanisms to regulate plant RSA,and proposed the perspectives for future research.

Key words: plant growth-promoting rhizobacteria, root system architecture, signal molecules, molecular mechanism

FU Yan-song, LI Yu-cong, XU Zhi-hui, SHAO Jia-hui, LIU Yun-peng, XUAN Wei, ZHANG Rui-fu. Research Progressing in Signals and Molecular Mechanisms of Plant Growth-Promoting Rhizobacteria to Regulate Plant Root Development[J]. Biotechnology Bulletin, 2020, 36(9): 42-48.

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