Effects of multifunctional plant rhizosphere promoting bacteria on maize growth in black soil areas in Northeast China

doi:10.13287/j.1001-9332.202008.036

Abstract

Abstract: The application of microbial fertilizer plays an important role in improving soil restoration and fertilizer utilization. The effects of microbial fertilizer are greatly affected by crop genotypes and ecological conditions. Little is known about the effects of microbial fertilizers on maize production in Northeast China. To develop microbial fertilizer specific to the black soil and the climate characteristics of Northeast China, we isolated five plant rhizosphere-promoting bacteria (PGPR), named as MZ1, MZ2, MZ3, MZ4 and MZ5, with different degrees of biological functions such as IAA synthesis, phosphate-solubilizing, potassium-solubilizing and siderophore-releasing, from the rhizosphere of maize field. The analysis of ecological adaptability showed that those five strains differed in salt resistance, drought tolerance, acid and alkali resistance, pesticide resistance. The 16S rRNA gene sequences analysis showed that the strains MZ1, MZ2, MZ3, MZ4 and MZ5 belonged to the genus of Sphingomonas, Enterobacter, Pseudomonas, Bacillus and Rhizobium, respectively. In maize field experiment with 50% nitrogen fertilizer reduction, the inoculation with MZ1, MZ3 and MZ5 increased grain yield by 19.9%-25.0%. MZ1, MZ3, and MZ5 could be used as microbial fertilizers for maize in Northeast China.

Key words: Northeast China, black soil, maize, PGPR, ecological adaptability, growth promoting

CHEN La, MI Guo-hua, LI Ke-ke, SHAO Hui, HU Dong, YANG Jun-peng, SUI Xin-hua, CHEN Wen-xin. Effects of multifunctional plant rhizosphere promoting bacteria on maize growth in black soil areas in Northeast China[J]. Chinese Journal of Applied Ecology, 2020, 31(8): 2759-2766.

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