イメージング質量分析による植物細胞壁木化過程の研究(<特集>情報処理システムとしての植物細胞壁)

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  • Studies on the plant cell wall lignification by imaging mass spectrometry(<Feature Articles>The plant cell wall as an information processing system)
  • イメージング質量分析による植物細胞壁木化過程の研究
  • イメージング シツリョウ ブンセキ ニ ヨル ショクブツ サイボウヘキ モクカ カテイ ノ ケンキュウ

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<p>Lignification is an important differentiation process in plant cell walls in which lignin is deposited in the polysaccharide matrix. The actual chemical structure of the lignin polymer is still unclear for several reasons : it has multiple structural units and bonding patterns ; it is entangled with the polysaccharide matrix and, therefore, very difficult to isolate ; and the lignin structure may vary among the different cells and tissues in plants. The controlling mechanism of lignin formation is also still controversial. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) has been used to investigate the structure and formation of lignin in individual cells ; herein, those lignin studies are reviewed. TOF-SIMS is a rapidly developing analytical method that can provide mass spectral information with submicron lateral resolution. The main polymer components of plant cell walls (cellulose, hemicellulose, and lignin) are detected as fragment ions in the TOF-SIMS spectra. Because an understanding of fragmentation behavior is essential in order to discuss the original structure, such behavior is described in detail. Subsequently, practical results on the relative amounts and the structure of the lignin in specific tissues are introduced. The latest advances in cryo-TOF-SIMS, which allows the analysis of frozen-hydrated samples, are also described. Cryo-TOF-SIMS is a powerful visualization tool, especially for water-soluble compounds of nearly equal distributions in a living system. The heterogeneous distribution of the many chemical components in plants should provide useful information for innovative discussions of the various mechanisms in plants.</p>

収録刊行物

  • 植物の生長調節

    植物の生長調節 50 (1), 57-63, 2015

    一般社団法人 植物化学調節学会

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