A new hypothesis on the strategy for acquisition of phosphorus in arbuscular mycorrhiza: Up-regulation of secreted acid phosphatase gene in the host plant

Tatsuhiro Ezawa, Masahito Hayatsu, Masanori Saito

研究成果: Article査読

39 被引用数 (Scopus)

抄録

The mycorrhiza-responsive phosphatase of Tagetes patula in symbiosis with Glomus etunicatum was detected by electrophoresis, was purified by column chromatography, and was characterized as acid phosphatase that was secreted into rhizosphere. The N-terminal amino acid sequence was determined by a gas-phase sequencer, and a cDNA fragment of the phosphatase gene (TpPAP1) was amplified by degenerate primers designed based on the N-terminal amino acid sequence. The full-length cDNA was obtained by the rapid amplification of cDNA ends technique. The TpPAP1 was of host origin, and the cDNA was 1,843 bp long with a predicted open reading frame of polypeptide of 466 amino acids. Phylogenetic analysis revealed that the gene fell into the cluster of plant high-molecular-weight purple acid phosphatase. Expression analysis of the TpPAP1 in T. patula in symbiosis with Archaeospora leptoticha showed that the levels of transcripts increased eightfold by mycorrhizal colonization. Western blot analysis revealed that the 57-kDa protein corresponding to the mycorrhiza-responsive phosphatase increased by mycorrhizal colonization. The present study proposes a new strategy for acquisition of P in arbuscular mycorrhizal associations in which the fungal partner activates a part of the low-P adaptation system of the plant partner, phosphatase secretion, and improves the overall efficiency of P uptake.

本文言語English
ページ(範囲)1046-1053
ページ数8
ジャーナルMolecular Plant-Microbe Interactions
18
10
DOI
出版ステータスPublished - 2005 10

ASJC Scopus subject areas

  • 生理学
  • 農業および作物学

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