Auxin influences strigolactones in pea mycorrhizal symbiosis
Auxin influences strigolactones in pea mycorrhizal symbiosis
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DOI：
10.1016/j.jplph.2012.11.002
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发表时间：
2013-03-15
影响因子：
4.3
通讯作者：
Foo, E.
中科院分区：
文献类型：
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作者：
Foo, E.
激素的相互作用对许多发育过程的控制至关重要，包括细胞内共生。研究了生长素和新植物激素独角麦内酯在调节丛枝菌根共生中的相互作用，这是在菌根物种中为数不多的生长素缺陷突变体之一，即豌豆（Pisum sativum）的生长素缺陷突变体。在低生长素bsh突变体中，根内真菌Glomus的菌根定植显著减少。bsh突变体还表现出了独脚金内酯分泌减少和独脚金内酯生物合成关键基因（PsCCD8）的表达。野生型植物的生长素含量随着茎环化而降低，独角麦内酯的分泌量也随之减少。低的独角麦内酯水平似乎至少是bsh突变体定植减少的部分原因，因为应用合成的独角麦内酯GR24可以部分地挽救bsh突变体的菌根表型。本研究的数据表明，突变型和野生型植物的根生长素含量与独角麦内酯分泌量相关。突变体研究表明，生长素可能通过控制根际和早期根定植过程中的独角麦内酯水平来调节丛枝菌根共生形成的早期事件。(C) 2012 Elsevier GmbH版权所有。
Hormone interactions are essential for the control of many developmental processes, including intracellular symbioses. The interaction between auxin and the new plant hormone strigolactone in the regulation of arbuscular mycorrhizal symbiosis was examined in one of the few auxin deficient mutants available in a mycorrhizal species, the auxin-deficient bsh mutant of pea (Pisum sativum). Mycorrhizal colonisation with the fungus Glomus intra radices was significantly reduced in the low auxin bsh mutant. The bsh mutant also exhibited a reduction in strigolactone exudation and the expression of a key strigolactone biosynthesis gene (PsCCD8). Strigolactone exudation was also reduced in wild type plants when the auxin content was reduced by stem girdling. Low strigolactone levels appear to be at least partially responsible for the reduced colonisation of the bsh mutant, as application of the synthetic strigolactone GR24 could partially rescue the mycorrhizal phenotype of bsh mutants. Data presented here indicates root auxin content was correlated with strigolactone exudation in both mutant and wild type plants. Mutant studies suggest that auxin may regulate early events in the formation of arbuscular mycorrhizal symbiosis by controlling strigolactone levels, both in the rhizosphere and possibly during early root colonisation. (C) 2012 Elsevier GmbH. All rights reserved.