<br>顶端优势的生长素独立效应诱导与芽生长相关的植物激素的变化,Plant Physiology

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顶端优势的生长素独立效应诱导与芽生长相关的植物激素的变化
Plant Physiology ( IF 6.5 ) Pub Date : 2023-01-24 , DOI: 10.1093/plphys/kiad034
Da Cao _{1,

2} , Tinashe Chabikwa ₂ , Francois Barbier _{1,

2} , Elizabeth A Dun _{1,

2} , Franziska Fichtner _{1,

2} , Lili Dong ₂ , Stephanie C Kerr ₂ , Christine A Beveridge _{1,

2}

Affiliation

植物生长的茎尖对茎分枝的抑制，称为顶端优势，最初被认为是由生长素介导的。最近，随着最近的研究强调糖在促进分枝中的作用，茎尖下沉强度在顶端优势期间的重要性再次出现。这对生长素和糖在顶端优势中的相对作用提出了许多悬而未决的问题。在这里，我们表明，断头后生长素的消耗并不总是芽中细胞分裂素快速增加的最初触发因素，而是与增强的糖相关。生长素也可能通过独脚金内酯发挥作用，独脚金内酯已被证明可以抑制断头后的分枝，但在这里我们表明独脚金内酯对断头后最初的芽生长没有显着影响。我们在此报告，当蔗糖或细胞分裂素丰富时，与后期相比，独脚金内酯在芽释放阶段的抑制作用较小，并且独脚金内酯处理可快速抑制完整植物豌豆（Pisum sativum）腋芽中细胞分裂素的积累。在最初的芽释放后，我们发现赤霉素在促进生长素下游的持续芽生长中发挥着重要作用。因此，我们能够提出一种顶端优势模型，该模型整合了生长素、蔗糖、独脚金内酯、细胞分裂素和赤霉素，并描述了芽释放到持续生长各个阶段的信号传导差异。

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Auxin-independent effects of apical dominance induce changes in phytohormones correlated with bud outgrowth

The inhibition of shoot branching by the growing shoot tip of plants, termed apical dominance, was originally thought to be mediated by auxin. Recently the importance of the shoot tip sink strength during apical dominance has re-emerged with recent studies highlighting roles for sugars in promoting branching. This raises many unanswered questions on the relative roles of auxin and sugars in apical dominance. Here we show that auxin depletion after decapitation is not always the initial trigger of rapid cytokinin increases in buds that are instead correlated with enhanced sugars. Auxin may also act through strigolactones which have been shown to suppress branching after decapitation, but here we show that strigolactones do not have a significant effect on initial bud outgrowth after decapitation. We report here that when sucrose or cytokinin is abundant, strigolactones are less inhibitory during the bud release stage compared to during later stages and that strigolactone treatment rapidly inhibits cytokinin accumulation in pea (Pisum sativum) axillary buds of intact plants. After initial bud release, we find an important role of gibberellin in promoting sustained bud growth downstream of auxin. We are therefore able to suggest a model of apical dominance that integrates auxin, sucrose, strigolactones, cytokinins and gibberellins and describes differences in signalling across stages of bud release to sustained growth.

更新日期：2023-01-24

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