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Effects of the fungal endophyte Phomopsis liquidambari on nitrogen uptake and metabolism in rice

文献类型： 外文期刊

作者： Yang, Bo 1 ; Wang, Xiao-Mi 1 ; Ma, Hai-Yan 1 ; Jia, Yong 1 ; Li, Xia 2 ; Dai, Chuan-Chao 1 ;

作者机构： 1.Nanjing Normal Univ, Jiangsu Key Lab Microbes & Funct Genom, Jiangsu Engn & Technol Res Ctr Industrializat Mic, Coll Life Sci, Nanjing 210023, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing 210014, Jiangsu, Peoples R China

关键词： Fungal endophyte;Rice;Symbiosis;Nitrogen uptake;Nitrogen metabolism;Gene expression

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

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收录情况： SCI

摘要： Phomopsis liquidambari can establish a mutualistic symbiotic relationship with rice. It promotes the growth and yield of the host plant and reduces the amount of nitrogen (N) fertilizer required for plant growth. However, the mechanisms responsible for the effects of the fungal endophyte on N use in rice are largely unknown. We conducted a hydroponic experiment to investigate the effects of P. liquidambari on N uptake and N metabolism in rice plants. Rice plants were cultivated in the presence or absence of P. liquidambari under three N levels. Under the low-N treatment, fungal infection significantly increased the biomass, and the total N, soluble protein, free amino acid, free NH4 ?, and chlorophyll contents of rice roots and shoots. The activities of nitrate reductase and glutamine synthetase were increased in infected rice plants. Some genes related to N uptake (OsAMT1;1, OsAMT1;3, OsAMT2;2, OsAMT3;2, OsAMT3;3, OsNRT2;1) and N metabolism (OsNR1, OsGS1, OsGS2, OsNADH-GOGAT) were also up-regulated in infected plants under the low-N treatment. However, these effects gradually weakened as the N level increased. The colonization rate of the endophyte substantially decreased with increasing N levels. Taken together, these results suggest that low-N fertilization induces a physiological state in rice that is favorable for the P. liquidambari symbiosis. The greater extent of P. liquidambari colonization under low-N conditions stimulated the expression of several genes involved in N uptake and N metabolism in rice, thereby enhancing N utilization. These results have implications for enhancing plant growth in low-input systems at nutrient-poor sites.

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