The ecological center has made progress in the molecular mechanism of arbuscular mycorrhiza to improve plant drought resistance

The ecological center has made progress in the molecular mechanism of arbuscular mycorrhiza to improve plant drought resistance

Recently, the research group of Chen Baodong, State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, has made important progress in studying molecular mechanisms of drought resistance of arbuscular mycorrhizal host plant Published in "Home" (New Phytologist 197: 617-630; 2013).

Arbuscular mycorrhiza (AM) fungi are widespread in nature and can form a symbiotic system with most terrestrial higher plants. It is one of the most closely related soil microorganisms discovered to date. Many studies have shown that the mycorrhizal symbiosis system is of great significance for plants to adapt to various stresses. There have been many reports on the active role of arbuscular mycorrhizal in the resistance of plants to drought stress, but most of the research has focused on the indirect effects of AM fungi, and the mycorrhizal affects the plant's own drought resistance physiology, and for AM fungi to enhance plant drought resistance The direct effect, especially the molecular evidence that AM fungi help host plants absorb water under drought stress, is still a research gap.

Chen Baodong's group used 5'- and 3'-RACE techniques to clone two aquaporin genes GintAQPF1 and GintAQPF2 from the AM fungus Glomus intraradices. The heterologous overexpression of Pichia pastoris proves that GintAQPF1 and GintAQPF2 have obvious water transport functions. Using polyethylene glycol to simulate drought stress, GintAQPF1 and GintAQPF2 increased protein activity under stress conditions, significantly promoting yeast growth. Under normal water conditions, the expression of GintAQPF1 and GintAQPF2 in corn mycorrhizal was the highest in root cells containing twigs, followed by extra-root hyphae, and finally germinated spores; drought stress significantly promoted the root cells and roots containing twigs The expression of GintAQPF1 and GintAQPF2 in the mycelium, and the growth of extra-root hyphae were also significantly induced by drought. Under drought stress, the high expression of two aquaporins and the promotion of mycelial growth led to a significant increase in the relative water content of the host plant roots.

This study provides direct molecular evidence for the absorption of water by arbuscular mycorrhizal fungi, which helps people to more fully understand the interaction mechanism between mycorrhizal fungi and host plants under stress, and also reveals that AM fungi maintain arid Potentially important role in structural and functional stability of fragile ecosystems in arid regions.

This work was supported by the important direction project of the Chinese Academy of Sciences Knowledge Innovation Project and the independent direction project of the State Key Laboratory of Urban and Regional Ecology.

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