论文部分内容阅读
铵态氮(NH4~+)和硝态氮(NO_3~-)是茶树吸收利用的两种主要氮素形态,且茶树具有对NH4~+偏性利用的特点,其对NH4~+的吸收利用效率明显高于NO_3~-,造成这种差异的原因可能在于茶树对NH4~+、NO_3~-吸收、同化机制的差异。从代谢途径来看,茶树对NH4~+、NO_3~-的吸收利用均首先需要通过对氮素的转运,然后再参与谷氨酰胺合成酶/谷酰胺–α–酮戊二酸氨基转移酶(GS/GOGAT)同化过程。系统地综述了茶树氮素利用的营养特性及对参与氮素吸收、同化过程所涉及关键基因的研究现状;同时重点关注氮素同化中限速酶——谷氨酰胺合成酶(GS)编码基因家族成员的相关研究,为解析茶树氮素偏性利用机制提供新的研究点。
NH4 + and NO3- are the two main forms of nitrogen absorption and utilization in tea plants, and tea plants have the characteristics of NH4 + biased utilization, and their absorption and utilization of NH4 + The efficiency is obviously higher than that of NO_3 ~ -, the reason of this difference may lie in the difference of NH4 +, NO_3 ~ - absorption and assimilation mechanism of tea tree. From the perspective of metabolic pathway, the absorption and utilization of NH4 + and NO3- in tea plant must first be mediated by nitrogen transport and then glutamine synthetase / glutamine-α-ketoglutarate aminotransferase GS / GOGAT) assimilation process. This paper systematically reviews the current status of the nutritional characteristics of nitrogen utilization in tea plant and the key genes involved in the process of nitrogen assimilation and assimilation. At the same time, we focus on the genes encoding rate-limiting enzyme-glutamine synthetase (GS) in nitrogen assimilation Family members of the relevant research, to resolve tea plant nitrogen offset utilization mechanism provides a new research point.