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Enhancement of root architecture and nitrate transporter gene expression improves plant growth and nitrogen uptake under long-term low-nitrogen stress in barley (Hordeum vulgare L.) seedlings

文献类型： 外文期刊

作者： Gao, Runhong 1 ; Guo, Guimei 2 ; Xu, Hongwei 2 ; Chen, Zhiwei 2 ; Li, Yingbo 2 ; Lu, Ruiju 2 ; Liu, Chenghong 2 ; Chen, J 1 ;

作者机构： 1.Yangzhou Univ, Coinnovat Ctr Modern Prod Technol Grain Crops Jia, Jiangsu Key Labs Crop Genet & Physiol & Plant Fun, Minist Educ, Yangzhou 225009, Jiangsu, Peoples R China

2.Shanghai Acad Agr Sci, Biotechnol Res Inst, Shanghai 201106, Peoples R China

3.Shanghai Key Lab Agr Genet & Breeding, Shanghai 201106, Peoples R China

关键词： Barley (Hordeum vulgare L; ); Low-nitrogen stress; Root morphology; Nitrogen influx rate; Nitrate transporter; Nitrogen assimilation

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

ISSN： 0167-6903

年卷期： 2021 年 95 卷 3 期

页码：

收录情况： SCI

摘要： Over application of nitrogen (N) fertilizers to crops ultimately causes N pollution in the ecosphere. Studying the response of plant growth and N uptake to low-N stress may aid in elucidating the mechanism of low N tolerance in plants and developing crop cultivars with high nitrogen use efficiency (NUE). In this study, a high-NUE mutant line A9-29 and the wild-type barley cultivar Hua30 were subjected to hydroponic culture with high and low N supply, and the dry weight, N accumulation, root morphology, and expression levels of the potential genes involved in nitrate uptake and assimilation were measured at seedling stage. The results showed that under low-N conditions, A9-29 had a higher dry weight, N content, N influx rate and larger root uptake area than did Hua30. Under long-term low-N stress, compared with Hua30, A9-29 demonstrated higher expression of the HvNRT2/3 genes, especially HvNRT2.1, HvNRT2.5, and HvNRT3.3. Similarly, the expression levels of N assimilation genes including HvNIA1, HvNIR1, HvGS1_1, HvGS1_3, and HvGLU2 increased significantly in A9-29. Taken together, our results suggested that the larger root area and the upregulation of nitrate transporter and assimilation genes may contribute to stronger N uptake capacity for plant growth and N accumulation in responding to long-term low-N stress. These findings may aid in understanding the mechanism of low N tolerance and developing barley cultivars with high-NUE.

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