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Nature :Myc因子在真菌与植物维持共生关系中发挥重要作用

来源:新华网 2011-01-12 11:52

法国研究人员1月6日报告说,他们发现了一种生物维持共生关系的关键因子。这一成果将有助于开发绿色技术,提高作物产量。

真菌与植物的共生由来已久,这种共生关系不但为真菌提供了栖身之所,也有助于植物充分吸收水和矿物质等营养素。

法国国家科研中心等机构的研究人员在新一期英国《自然》杂志上介绍说,他们在对共生关系进行研究的过程中发现了一种名为Myc的因子。它是真菌菌根在共生过程中合成的,虽然数量极少,却十分活跃。它能通过信号传导,刺激植物根部生长。此外,Myc还能在植物的生长中发挥调节器的作用。

此前研究曾发现过一种名为Nod的因子,它也存在于真菌菌根部位,其作用与Myc十分类似,现正被用于提高大豆、苜蓿、豌豆等作物的产量。法国研究人员认为,Myc的应用范围应该比Nod更广泛,且与使用化学肥料不同,这类分子技术将不会对环境产生任何影响。(生物谷Bioon.com)

生物谷推荐原文出处:

Nature   doi:10.1038/nature09622

Fungal lipochitooligosaccharide symbiotic signals in arbuscular mycorrhiza

Fabienne Maillet,Véréna Poinsot,Olivier André,Virginie Puech-Pagès,Alexandra Haouy,Monique Gueunier,Laurence Cromer,Delphine Giraudet,Damien Formey,Andreas Niebel,Eduardo Andres Martinez,Hugues Driguez,Guillaume Bécard& Jean Dénarié

Arbuscular mycorrhiza (AM) is a root endosymbiosis between plants and glomeromycete fungi. It is the most widespread terrestrial plant symbiosis, improving plant uptake of water and mineral nutrients. Yet, despite its crucial role in land ecosystems, molecular mechanisms leading to its formation are just beginning to be unravelled. Recent evidence suggests that AM fungi produce diffusible symbiotic signals. Here we show that Glomus intraradices secretes symbiotic signals that are a mixture of sulphated and non-sulphated simple lipochitooligosaccharides (LCOs), which stimulate formation of AM in plant species of diverse families (Fabaceae, Asteraceae and Umbelliferae). In the legume Medicago truncatula these signals stimulate root growth and branching by the symbiotic DMI signalling pathway. These findings provide a better understanding of the evolution of signalling mechanisms involved in plant root endosymbioses and will greatly facilitate their molecular dissection. They also open the way to using these natural and very active molecules in agriculture.

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