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Gibberellins Interfere with Symbiosis Signaling and Gene Expression, and Alter Colonization by Arbuscular Mycorrhizal Fungi in Lotus japonicus.

著者 Takeda N , Handa Y , Tsuzuki S , Kojima M , Sakakibara H , Kawaguchi M
Plant Physiol.2014 Dec 19 ; ():.
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Arbuscular mycorrhiza (AM) is a mutualistic plant-fungal interaction that confers great advantages for plant growth. Arbuscular mycorrhizal (AM) fungi enter the host root and form symbiotic structures that facilitate nutrient supplies between the symbionts. The phytohormones gibberellins (GAs) are known to inhibit AM fungal infection. However, our transcriptome analysis and phytohormone quantification revealed GA accumulation in the roots of Lotus japonicus infected with AM fungi, suggesting that de novo GA synthesis plays a role in AM development. We found pleiotropic effects of GAs on the AM fungal infection. In particular, the morphology of AM fungal colonization was drastically altered by the status of GA signaling in the host root. Exogenous GA treatment inhibited AM hyphal entry into the host root and suppressed expression of RAM1 and RAM2 homologs that function in hyphal entry and arbuscule formation. On the other hand, inhibition of GA biosynthesis or suppression of GA signaling also affected AM development in the host root. Low GA conditions suppressed SbtM1 expression that is required for AM fungal colonization, and reduced hyphal branching in the host root. The reduced hyphal branching and SbtM1 expression caused by inhibition of GA biosynthesis were recovered by GA treatment, supporting that insufficient GA signaling causes the inhibitory effects on AM development. Most studies have focused on the negative role of GA signaling, whereas our study demonstrates that GA signaling also positively interacts with symbiotic responses and promotes AM colonization of the host root.
PMID: 25527715 [PubMed - as supplied by publisher]
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