論文

査読有り 国際誌
2019年4月

The Structural Integrity of Lignin Is Crucial for Resistance against Striga hermonthica Parasitism in Rice.

Plant physiology
  • J Musembi Mutuku
  • ,
  • Songkui Cui
  • ,
  • Chiaki Hori
  • ,
  • Yuri Takeda
  • ,
  • Yuki Tobimatsu
  • ,
  • Ryo Nakabayashi
  • ,
  • Tetsuya Mori
  • ,
  • Kazuki Saito
  • ,
  • Taku Demura
  • ,
  • Toshiaki Umezawa
  • ,
  • Satoko Yoshida
  • ,
  • Ken Shirasu

179
4
開始ページ
1796
終了ページ
1809
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1104/pp.18.01133

Striga species are parasitic weeds that seriously constrain the productivity of food staples, including cereals and legumes, in Sub-Saharan Africa and Asia. In eastern and central Africa, Striga spp. infest as much as 40 million hectares of smallholder farmland causing total crop failure during severe infestation. As the molecular mechanisms underlying resistance are yet to be elucidated, we undertook a comparative metabolome study using the Striga-resistant rice (Oryza sativa) cultivar 'Nipponbare' and the susceptible cultivar 'Koshihikari'. We found that a number of metabolites accumulated preferentially in the Striga-resistant cultivar upon Striga hermonthica infection. Most apparent was increased deposition of lignin, a phenylpropanoid polymer mainly composed of p-hydroxyphenyl (H), guaiacyl (G), and syringyl (S) aromatic units, around the site of interaction in Nipponbare. The increased deposition of lignin was accompanied by induction of the expression of corresponding enzyme-encoding genes in the phenylpropanoid pathway. In addition, perturbing normal lignin composition by knocking down or overexpressing the genes that regulate lignin composition, i.e. p-COUMARATE 3-HYDROXYLASE or FERULATE 5-HYDROXYLASE, enhanced susceptibility of Nipponbare to Shermonthica infection. These results demonstrate that enhanced lignin deposition and maintenance of the structural integrity of lignin polymers deposited at the infection site are crucial for postattachment resistance against Shermonthica.

リンク情報
DOI
https://doi.org/10.1104/pp.18.01133
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/30670602
PubMed Central
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6446757

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