Zhao Yanhui, Zha Manrong, Xu Congshan, Hou Fangxu, Wang Yan
College of Biology Resources and Environmental Sciences, Jishou University, Jishou 416000, China.
Key Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou 416000, China.
Plants (Basel). 2023 Dec 27;13(1):91. doi: 10.3390/plants13010091.
Removing the panicle encourages the growth of buds on the elongated node by getting rid of apical dominance. Strigolactones (SLs) are plant hormones that suppress tillering in rice. The present study employed panicle removal (RP) and external application of synthesized strigolactones (GR) to modulate rice bud growth at node 2. We focused on the full-heading stage to investigate proteomic changes related to bud germination (RP-Co) and suppression (GR-RP). A total of 434 represented differentially abundant proteins (DAPs) were detected, with 272 DAPs explicitly specified in the bud germination process, 106 in the bud suppression process, and 28 in both. DAPs in the germination process were most associated with protein processing in the endoplasmic reticulum and ribosome biogenesis. DAPs were most associated with metabolic pathways and glycolysis/gluconeogenesis in the bud suppression process. Sucrose content and two enzymes of sucrose degradation in buds were also determined. Comparisons of DAPs between the two reversed processes revealed that sucrose metabolism might be a key to modulating rice bud growth. Moreover, sucrose or its metabolites should be a signal downstream of the SLs signal transduction that modulates rice bud outgrowth. Contemplating the result so far, it is possible to open new vistas of research to reveal the interaction between SLs and sucrose signaling in the control of tillering in rice.
去除稻穗通过消除顶端优势来促进伸长节上芽的生长。独脚金内酯（SLs）是抑制水稻分蘖的植物激素。本研究采用去除稻穗（RP）和外源施加合成独脚金内酯（GR）来调节水稻第二节上芽的生长。我们聚焦于齐穗期，以研究与芽萌发（RP-Co）和抑制（GR-RP）相关的蛋白质组变化。共检测到434个代表性差异丰富蛋白（DAPs），其中272个DAPs在芽萌发过程中有明确规定，106个在芽抑制过程中有明确规定，28个在两个过程中都有明确规定。萌发过程中的DAPs与内质网中的蛋白质加工和核糖体生物合成最为相关。芽抑制过程中的DAPs与代谢途径和糖酵解/糖异生最为相关。还测定了芽中的蔗糖含量和两种蔗糖降解酶。两个相反过程中DAPs的比较表明，蔗糖代谢可能是调节水稻芽生长的关键。此外，蔗糖或其代谢产物应该是独脚金内酯信号转导下游调节水稻芽生长的信号。鉴于目前的结果，有可能开辟新的研究视野，以揭示独脚金内酯与蔗糖信号在水稻分蘖控制中的相互作用。
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