Research progress on species and functions of plant growth promoting rhizobacteria in grasslands in China
Plant growth promoting rhizobacteria(PGPR)has some advantages in nitrogen fixation,phosphorus solubilization,potassi-um release,the secretion of endogenous hormone and so on.In this paper,the main species and growth characteristics of PGPR in grass-lands,the positive effects of PGPR on grasslands growth and soil fertility improvement,and the effects on resistance of grassland plants were reviewed,and the process and mechanism of PGPR promoting herbage growth were analyzed.This paper provides a theoretical basis for the future application of PGPR in grasslands production.The contributions of PGPR to grasslands are multifaceted:secreting endogenous hor-mones,regulating the level of endogenous hormones in herbage,promoting the growth and nutrient absorption of herbage,improving the quality of herbage;Promoting the transformation of soil elements to available state,making soil nutrients in active state,improving soil physical and chemical properties;secreting iron carrier and ACC deaminase to enhance the stress resistance of herbage.In the future,the main application directions of PGPR in grassland production are as follows:broaden the access to PGPR,speed up the process of replacing chemical fertilizer with microbial fertilizer produced by PGPR,Screen PGPR microbial fertilizer to improve grassland soil quality,and screen PGPR with strong comprehensive stress resistance.
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