Moss Biology and Phytohormones - Cytokinins in Physcomitrella

K. von Schwartzenberg

doi:10.1055/s-2006-923962

Plant Biology, Table of Contents

Plant Biol (Stuttg) 2006; 8(3): 382-388
DOI: 10.1055/s-2006-923962

Review Article

Georg Thieme Verlag Stuttgart KG · New York

Moss Biology and Phytohormones - Cytokinins in Physcomitrella

K. von Schwartzenberg¹

¹Biozentrum Klein Flottbek und Botanischer Garten, Universität Hamburg, Ohnhorststraße 18, 22609 Hamburg, Germany

Abstract

Mosses present several advantages for the analysis of phytohormone physiology. Their enormous regeneration capacity, the possibility of controlling their whole life cycle under in vitro culture conditions, as well as the small number of cell types facilitate studies of hormone homeostasis. This review focuses on the metabolism and biosynthesis of cytokinins, mostly summarising data obtained using the moss Physcomitrella patens (Hedw.) B.S.G. which has served as a model system for cytokinin research for many years. A comparison of metabolic differences with respect to seed plants is presented, pointing out an important role of adenosine kinase for the formation of nucleotides during cytokinin interconversion in Physcomitrella. Results on cytokinin biosynthesis in Physcomitrella are summarised with respect to the ove mutants, which can be considered unique in the plant kingdom due to their strong overproduction of cytokinins. The ove phenotype is correlated with both increased activity in early stages of cytokinin biosynthesis as well as increased conversion of cytokinin riboside to the base. Cytokinin interconverting reactions can contribute to the increased levels of cytokinins in ove mutants. Further studies on hormone physiology in moss will help to complete our understanding of hormonal homeostasis by elucidating the situation in an evolutionary early embryophyte.

Key words

Bryophyte - adenosine kinase - biosynthesis - metabolism - cytokinin - Physcomitrella.

Full Text

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K. von Schwartzenberg

Biozentrum Klein Flottbek und Botanischer Garten
Universität Hamburg

Ohnhorststraße 18

22609 Hamburg

Germany

Email: kvschwartzenberg@iangbot.uni-hamburg.de

Guest Editor: R. Reski