Trehalose 6-Phosphate/SnRK1 Signaling Participates in Harvesting-Stimulated Rubber Production in the Hevea Tree
文献类型： 外文期刊
作者： Zhou, Binhui 1 ; Fang, Yongjun 2 ; Xiao, Xiaohu 2 ; Yang, Jianghua 2 ; Qi, Jiyan 1 ; Qi, Qi 6 ; Fan, Yujie 1 ; Tang, Chaorong 1 ;
作者机构： 1.Hainan Univ, Coll Trop Crops, Haikou 570228, Hainan, Peoples R China
2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Hainan, Peoples R China
3.Nat Rubber Cooperat Innovat Ctr Hainan Prov, Haikou 570228, Hainan, Peoples R China
4.Minist Educ PRC, Haikou 570228, Hainan, Peoples R China
5.Hainan Univ, Sanya Nanfan Res Inst, Hainan Yazhou Bay Seed Lab, Sanya 572025, Peoples R China
6.Beijing Forestry Univ, Coll Biol Sci & Biotechnol, Beijing 100083, Peoples R China
关键词： Hevea brasiliensis; laticifers; rubber; harvesting; sucrose; trehalose-6-phosphate (T6P); T6P synthase; SnRK1
期刊名称：PLANTS-BASEL （ 影响因子：4.658； 五年影响因子：4.827 ）
ISSN：
年卷期： 2022 年 11 卷 21 期
页码：
收录情况： SCI
摘要： Trehalose 6-phosphate (T6P), the intermediate of trehalose biosynthesis and a signaling molecule, affects crop yield via targeting sucrose allocation and utilization. As there have been no reports of T6P signaling affecting secondary metabolism in a crop plant, the rubber tree Hevea brasiliensis serves as an ideal model in this regard. Sucrose metabolism critically influences the productivity of natural rubber, a secondary metabolite of industrial importance. Here, we report on the characterization of the T6P synthase (TPS) gene family and the T6P/SNF1-related protein kinasel (T6P/SnRK1) signaling components in Hevea laticifers under tapping (rubber harvesting), an agronomic manipulation that itself stimulates rubber production. A total of fourteen TPS genes were identified, among which a class II TPS gene, HbTPS5, seemed to have evolved with a function specialized in laticifers. T6P and trehalose increased when the trees were tapped, this being consistent with the observed enhanced activities of TPS and T6P phosphatase (TPP) and expression of an active TPS-encoding gene, HbTPS1. On the other hand, SnRK1 activities decreased, suggesting the inhibition of elevated T6P on SnRK1. Expression profiles of the SnRK1 marker genes coincided with elevated T6P and depressed SnRK1. Interestingly, HbTPS5 expression decreased significantly with the onset of tapping, suggesting a regulatory function in the T6P pathway associated with latex production in laticifers. In brief, transcriptional, enzymatic, and metabolic evidence supports the participation of T6P/SnRK1 signaling in rubber formation, thus providing a possible avenue to increasing the yield of a valuable secondary metabolite by targeting T6P in specific cells.
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