Journal of Plant Research

, Volume 124, Issue 4, pp 437–453

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

Authors

  • Daisuke Takezawa
    • Graduate School of Science and Engineering, Institute for Environmental Science and TechnologySaitama University
  • Kenji Komatsu
    • Department of BioscienceTokyo University of Agriculture
    • Kihara Institute for Biological ResearchYokohama City University
    • Department of BioscienceTokyo University of Agriculture
JPR Symposium Opening a New Era of ABA Research

DOI: 10.1007/s10265-011-0410-5

Cite this article as:
Takezawa, D., Komatsu, K. & Sakata, Y. J Plant Res (2011) 124: 437. doi:10.1007/s10265-011-0410-5

Abstract

Abscisic acid (ABA) is not a plant-specific compound but one found in organisms across kingdoms from bacteria to animals, suggesting that it is a ubiquitous and versatile substance that can modulate physiological functions of various organisms. Recent studies have shown that plants developed an elegant system for ABA sensing and early signal transduction mechanisms to modulate responses to environmental stresses for survival in terrestrial conditions. ABA-induced increase in stress tolerance has been reported not only in vascular plants but also in non-vascular bryophytes. Since bryophytes are the key group of organisms in the context of plant evolution, clarification of their ABA-dependent processes is important for understanding evolutionary adaptation of land plants. Molecular approaches using Physcomitrella patens have revealed that ABA plays a role in dehydration stress tolerance in mosses, which comprise a major group of bryophytes. Furthermore, we recently reported that signaling machinery for ABA responses is also conserved in liverworts, representing the most basal members of extant land plant lineage. Conservation of the mechanism for ABA sensing and responses in angiosperms and basal land plants suggests that acquisition of this mechanism for stress tolerance in vegetative tissues was one of the critical evolutionary events for adaptation to the land. This review describes the role of ABA in basal land plants as well as non-land plant organisms and further elaborates on recent progress in molecular studies of model bryophytes by comparative and functional genomic approaches.

Keywords

ABA signalingBryophytesEvolutionGroup A PP2CMarchantia polymorphaPhyscomitrella patens

Supplementary material

10265_2011_410_MOESM1_ESM.pptx (106 kb)
Supplementary figure (PPTX 106 kb)
10265_2011_410_MOESM2_ESM.xls (35 kb)
Supplementary table (XLS 35 kb)

Copyright information

© The Botanical Society of Japan and Springer 2011