文献类型： 外文期刊
作者： Wang, Tianhao 1 ; Miao, Miao 1 ; Zhao, Jinfeng 1 ; Kumar, Ashmit 1 ; Li, Xueyong 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Natl Key Facil Crop Gene Resources & Genet Improve, Beijing, Peoples R China
2.Fiji Natl Univ, Coll Agr Fisheries & Forestry, Koronivia, Fiji
关键词： phloem; phytohormone; shoot branching; sink; source; sugars; tillering
期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.3； 五年影响因子：7.7 ）
ISSN： 0140-7791
年卷期： 2025 年
页码：
收录情况： SCI
摘要： Plant phenotypes exhibit high plasticity, with shoot branching as a prime example and a key factor influencing yield in many species. The availability of photosynthates is a critical determinant of shoot branching (or tillering in monocots). Carbohydrates, primarily in the form of sucrose, are synthesised in actively photosynthetic leaves (sources) and transported to non-photosynthetic tissues (sinks), such as tiller buds. Glucose, fructose, sucrose and their intermediates, including trehalose-6-phosphate (Tre6P), function both as energy sources and signalling molecules. Once sucrose is transported from source to sink tissues, it is rapidly hydrolysed into hexoses, which support starch accumulation, and the formation and elongation of tiller buds (outgrowth into a branch or tiller). This review aims to summarise recent discoveries with the focus on (i) sugar synthesis, metabolism, loading and unloading; (ii) sugars as crucial signals in regulating branching; (iii) roles of sugars in mediating the environment-modulated branching; (iv) the interactions between sugars and phytohormonal pathways that influence bud outgrowth and branching. A comprehensive understanding of sugar synthesis, transport, metabolism and signalling in relation to shoot branching will aid in optimising plant architecture and ultimately contribute to enhanced crop yield.
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