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Adventitious Root Growth and Cell-Cycle Induction in Deepwater Rice1

René Lorbiecke and Margret Sauter*

Institut für Allgemeine Botanik, Angewandte Molekularbiologie der Pflanzen II, Ohnhorststrasse 18, D-22609 Hamburg, Germany

Deepwater rice (Oryza sativa) is adapted to survive conditions of severe flooding over extended periods of time. During such periods adventitious roots develop to provide water, nutrients, and anchorage. In the present study the growth of adventitious roots was induced by treatment with ethylene but not auxin, cytokinin, or gibberellin. Root elongation was enhanced between 8 and 10 h after submergence. The population of cells in the S phase and expression of the S-phase-specific histone H3 gene increased within 4 to 6 h. Within 6 to 8 h the G2-phase population increased. Cell-cycle activation was accompanied by sequential induction of a cdc2-activating kinase homolog, R2, of two cdc2 genes, cdc2Os-1 and cdc2Os-2, and of three cyclin genes, cycA1;3, cycB2;1, and cycB2;2, but only induction of the R2 gene expression preceded the induction of the S phase, possibly contributing to cell-cycle regulation in the G1 phase. Both cdc2 genes were expressed at slightly higher levels during DNA replication. Transcripts of the A-type cyclin accumulated during the S and G2 phases, and transcripts of the B-type cyclins accumulated during the G2 phase. Cyclin expression was induced at all nodes with a similar time course, suggesting that ethylene acts systemically and that root primordia respond to ethylene at an early developmental stage.

1   This work was supported by grants from the Deutsche Forschungsgemeinschaft, the Arthur und Aenne Feindt-Stiftung, and the Graduiertenkolleg Biotechnologie at the University of Hamburg and at the Technical University Hamburg-Harburg (to R.L.).
*   Corresponding author; e-mail msauter{at}botanik.unihamburg.de; fax 49-40-82282-229.

Plant Physiol. (1999) 119: 21-30
Copyright Clearance Center:   0032-0889/99/119//10
© 1999 American Society of Plant Physiologists




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