Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, Scottsville, South Africa.
Ann Bot. 2019 Nov 15;124(5):749-767. doi: 10.1093/aob/mcz100.
Strigolactones (SLs) are a diverse class of butenolide-bearing phytohormones derived from the catabolism of carotenoids. They are associated with an increasing number of emerging regulatory roles in plant growth and development, including seed germination, root and shoot architecture patterning, nutrient acquisition, symbiotic and parasitic interactions, as well as mediation of plant responses to abiotic and biotic cues.
Here, we provide a concise overview of SL biosynthesis, signal transduction pathways and SL-mediated plant responses with a detailed discourse on the crosstalk(s) that exist between SLs/components of SL signalling and other phytohormones such as auxins, cytokinins, gibberellins, abscisic acid, ethylene, jasmonates and salicylic acid.
SLs elicit their control on physiological and morphological processes via a direct or indirect influence on the activities of other hormones and/or integrants of signalling cascades of other growth regulators. These, among many others, include modulation of hormone content, transport and distribution within plant tissues, interference with or complete dependence on downstream signal components of other phytohormones, as well as acting synergistically or antagonistically with other hormones to elicit plant responses. Although much has been done to evince the effects of SL interactions with other hormones at the cell and whole plant levels, research attention must be channelled towards elucidating the precise molecular events that underlie these processes. More especially in the case of abscisic acid, cytokinins, gibberellin, jasmonates and salicylic acid for which very little has been reported about their hormonal crosstalk with SLs.
独脚金内酯（SLs）是一类从类胡萝卜素分解代谢中衍生出来的含有丁烯内酯的植物激素。它们与植物生长和发育中越来越多的新兴调节作用有关，包括种子萌发、根和茎的结构模式、养分获取、共生和寄生相互作用，以及介导植物对非生物和生物线索的反应。
本文提供了 SL 生物合成、信号转导途径以及 SL 介导的植物反应的简要概述，并详细论述了 SL 与其他植物激素（如生长素、细胞分裂素、赤霉素、脱落酸、乙烯、茉莉酸和水杨酸）之间存在的串扰（cross talk）。
SL 通过直接或间接影响其他激素的活性和/或其他生长调节剂信号转导途径的组成部分，对生理和形态过程施加其控制作用。其中包括调节激素在植物组织内的含量、运输和分布，干扰或完全依赖其他植物激素下游信号成分，以及与其他激素协同或拮抗作用以引发植物反应。尽管已经做了很多工作来证明 SL 与其他激素在细胞和整个植物水平上的相互作用的影响，但必须将研究注意力集中在阐明这些过程背后的确切分子事件上。特别是在脱落酸、细胞分裂素、赤霉素、茉莉酸和水杨酸方面，关于它们与 SLs 的激素串扰，几乎没有报道。
