Tamaoki Daisuke, Karahara Ichirou, Schreiber Lukas, Wakasugi Tatsuya, Yamada Kyoji, Kamisaka Seiichiro
Department of Biology, Faculty of Science, Toyama University, Toyama 930-8555, Japan,
J Plant Res. 2006 Mar;119(2):79-84. doi: 10.1007/s10265-005-0243-1. Epub 2005 Nov 19.
The effects of hypergravity on elongation growth and lignin deposition in secondary cell walls of the Arabidopsis thaliana (L.) Heynh. inflorescence stem were examined in plants grown for 3 days after exposure to hypergravity in the direction from shoot to root at 300 g for 24 h. The content of acetylbromide-extractable lignins in a secondary cell wall fraction prepared by enzyme digestion of inflorescence stem segments removing primary cell wall components was significantly increased by the hypergravity stimulus. Xylem vessels, particularly in a region closer to the base of the inflorescence stem, increased in number. Gadolinium chloride at 0.1 mM, a blocker of mechanoreceptors, partially suppressed the effect of hypergravity on lignin deposition in the secondary cell wall fraction. These results suggest that mechanoreceptors are responsible for hypergravity-induced lignin deposition in secondary cell walls in A. thaliana inflorescence stems.
研究了超重力对拟南芥（L.）海因植株花序茎次生细胞壁伸长生长和木质素沉积的影响。将植株在300 g条件下从地上部向根部施加超重力24小时后，再生长3天，进行相关检测。通过酶消化去除花序茎段的初生细胞壁成分制备次生细胞壁组分，超重力刺激显著增加了其中乙酰溴可提取木质素的含量。木质部导管数量增加，尤其是在靠近花序茎基部的区域。0.1 mM的氯化钆作为机械感受器阻滞剂，部分抑制了超重力对次生细胞壁组分中木质素沉积的影响。这些结果表明，机械感受器在超重力诱导拟南芥花序茎次生细胞壁木质素沉积中发挥作用。
