PLANT GROWTH AND GLUTAMINE SYNTHASE GENE SCGS1 EXPRESSION IN SUGARCANE (SACCHARUM L. SPP. HYBRIDS) UNDER DIFFERENT NITROGEN LEVELS

文献类型： 外文期刊

第一作者： Zhu, K.

作者： Zhu, K.;Yuan, D.;Xing, Y. X.;Nong, Y. Y.;Yang, L. T.;Li, Y. R.;Li, Y. R.;Li, Y. R.

作者机构：

关键词： physiological characteristic; photosynthesis; molecular response; chlorophyll; nitrogen utilization

期刊名称：APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH （ 影响因子：0.711； 五年影响因子：0.796 ）

ISSN： 1589-1623

年卷期： 2019 年 17 卷 5 期

页码：

收录情况： SCI

摘要： The main aim of this study was to investigate the responses of agronomic traits, photosynthesis and glutamine synthase (GS) expression in different sugarcane (Saccharum L. spp. hybrids) varieties under different nitrogen levels. Sugarcane varieties GT11 (nitrogen inefficient) and GXB9 (nitrogen efficient) were planted at three levels of nitrogen supply, e.g. 0 kg/ha (low nitrogen level, L-N), 150 kg/ha (medium nitrogen level, M-N) and 300 kg/ha (high nitrogen level, H-N) of urea application. The agronomic traits, photosynthesis, and GS activity and expression were determined at different growth stages of sugarcane. The results showed that the plant height, stalk diameter, leaf area, chlorophyll content, net photosynthetic rate, GS activity and GS1 protein expression in GT11 increased with the increase of nitrogen application, while the plant height, stalk diameter, chlorophyll content, net photosynthetic rate, GS activity and GS1 protein expression in GXB9 reached the maximum on medium nitrogen level. The leaf area of GXB9 was always higher than that of GT11 on the same nitrogen level. Under the low and medium nitrogen levels, the activities of GS and expression of GS1 protein were higher in GXB9 than GT11. The transcription expression levels of scGS1.a and scGS1.b were down-regulated while that of scGS1.c up-regulated by the increase of nitrogen application level. In conclusion, the nitrogen inefficient sugarcane variety needs more nitrogen application, but excessive nitrogen application is not good for the nitrogen efficient sugarcane variety.

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