Chinese Journal OF Rice Science >
Effects of Plant Growth-promoting Rhizobacteria(PGPR) on Physiological Characteristics of Rice Under Drought Stress
Received date: 2017-10-10
Revised date: 2017-12-15
Online published: 2018-09-10
【Objective】This study aims to reveal the effects of plant growth-promoting rhizobacteria Bacillus cereus F06 on physiological characteristics of the rice Shanyou 63 under different drought stress treatments(light, moderate, severe and a control).【Method】The combined effects of F06 inoculation and various levels of drought stress on the photosynthetic characteristics, chlorophyll fluorescence parameters, cytokinin and abscisic acid(ABA) concentrations, relative water content,and relative electrolyte leakage were studied in a pot experiment. 【Result】The results showed that Pn and gs decreased with increasing drought stress. However, F06 inoculation significantly slowed down the decrease of Pn and gs under drought stress compared with non-inoculation(NP) treatment, Pn and gs increased by 7.67%, 12.97%, 18.14% and 11.51%, 16.63% and 17.07%, respectively. With the intensifying drougnt stress, it followed an increasing trend. F06 inoculation inhibited the decrease of Fv/ Fm and qP and the increase of Fo, NPQ and improved the light conversion efficiency of rice leaves significantly under drought stress. Under the drought stress, B.cereus F06 inoculation could reduce the change amplitude of leaf water potential, relative water content and relative conductivity. However, F06 inoculation could not reverse the decrease trend of leaf water potential,relative water content and relative conductivity. F06 inoculation also significantly depressed the pigment decomposition or reduction. Although no significant increase was observed under well-watered conditions, drought significantly reduced the cytokinin(CTK) content in leaves and roots of rice, and increased ABA content in leaves, but F06 inoculation significantly increased the cytokinin content of drought-stressed leaves and roots Shanyou 63. 【Conclusion】In conclusion,inoculation of PGPR could reduce the decomposition or loss of photosynthetic pigments and improve the photosynthetic rate,showing real potential for practical use in arid environments as a drought stress inhibitor．
Su CHEN, Jiankun XIE, Wenxin HUANG, Dengyun CHEN, Xiaojian PENG, Xueqin FU . Effects of Plant Growth-promoting Rhizobacteria(PGPR) on Physiological Characteristics of Rice Under Drought Stress[J]. Chinese Journal OF Rice Science, 2018 , 32(5) : 485 -492 . DOI: 10.16819/j.1001-7216.2018.7123
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