Biological implications of the occurrence of 32 members of the XTH (xyloglucan endotransglucosylase/hydrolase) family of proteins in the bryophyte Physcomitrella patens

Ryusuke Yokoyama, Yohei Uwagaki, Hiroki Sasaki, Taro Harada, Yuji Hiwatashi, Mitsuyasu Hasebe, Kazuhiko Nishitani

研究成果査読

37 被引用数 (Scopus)

抄録

This comprehensive overview of the xyloglucan endotransglucosylase/ hydrolase (XTH) family of genes and proteins in bryophytes, based on research using genomic resources that are newly available for the moss Physcomitrella patens, provides new insights into plant evolution. In angiosperms, the XTH genes are found in large multi-gene families, probably reflecting the diverse roles of individual XTHs in various cell types. As there are fewer cell types in P.patens than in angiosperms such as Arabidopsis and rice, it is tempting to deduce that there are fewer XTH family genes in bryophytes. However, the present study unexpectedly identified as many as 32 genes that potentially encode XTH family proteins in the genome of P.patens, constituting a fairly large multi-gene family that is comparable in size with those of Arabidopsis and rice. In situ localization of xyloglucan endotransglucosylase activity in this moss indicates that some P.patens XTH proteins exhibit biochemical functions similar to those found in angiosperms, and that their expression profiles are tissue-dependent. However, comparison of structural features of families of XTH genes between P.patens and angiosperms demonstrated the existence of several bryophyte-specific XTH genes with distinct structural and functional features that are not found in angiosperms. These bryophyte-specific XTH genes might have evolved to meet morphological and functional needs specific to the bryophyte. These findings raise interesting questions about the biological implications of the XTH family of proteins in non-seed plants.

本文言語English
ページ(範囲)645-656
ページ数12
ジャーナルPlant Journal
64
4
DOI
出版ステータスPublished - 11月 2010
外部発表はい

ASJC Scopus subject areas

  • 遺伝学
  • 植物科学
  • 細胞生物学

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