AKIN beta 1 is Involved in the Regulation of Nitrogen Metabolism and Sugar Signaling in Arabidopsis

作者：Li Xiao Fang^*; Li Yu Ju; An Ying Hui; Xiong Li Jun; Shao Xing Hua; Wang Yang; Sun Yue

来源：Journal of Integrative Plant Biology, 2009, 51(5): 513-520.

DOI：10.1111/j.1744-7909.2009.00811.x

• AKIN beta 1
• metabolism
• nitrate reductase
• sucrose phosphate synthase
• sugar signaling

Sucrose non-fermenting-1-related protein kinase 1 (SnRK1) has been located at the heart of the control of metabolism and development in plants. The active SnRK1 form is usually a heterotrimeric complex. Subcellular localization and specific target of the SnRK1 kinase are regulated by specific beta subunits. In Arabidopsis, there are at least seven genes encoding beta subunits, of which the regulatory functions are not yet clear. Here, we tried to study the function of one beta subunit, AKIN beta 1. It showed that AKIN beta 1 expression was dramatically induced by ammonia nitrate but not potassium nitrate, and the investigation of AKIN beta 1 transgenic Arabidopsis and T-DNA insertion lines showed that AKIN beta 1 negatively regulated the activity of nitrate ruductase and was positively involved in sugar repression in early seedling development. Meanwhile AKIN beta 1 expression was reduced upon sugar treatment (including mannitol) and did not affect the activity of sucrose phosphate synthase. The results indicate that AKIN beta 1 is involved in the regulation of nitrogen metabolism and sugar signaling.

• 出版日期2009-5
• 单位华东师范大学