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Gurung S, Cohen MF, Fukuto J, et al. Polyamine-Induced Rapid Root Abscission in Azolla pinnata. J Amino Acids. 2012;2012:493209doi: 10.1155/2012/493209.
Gurung, S., Cohen, M. F., Fukuto, J., & Yamasaki, H. (2012). Polyamine-Induced Rapid Root Abscission in Azolla pinnata. Journal of amino acids, 2012493209. https://doi.org/10.1155/2012/493209
Gurung, Sushma, et al. "Polyamine-Induced Rapid Root Abscission in Azolla pinnata." Journal of amino acids vol. 2012 (2012): 493209. doi: https://doi.org/10.1155/2012/493209
Gurung S, Cohen MF, Fukuto J, Yamasaki H. Polyamine-Induced Rapid Root Abscission in Azolla pinnata. J Amino Acids. 2012;2012:493209. doi: 10.1155/2012/493209. Epub 2012 Sep 11. PMID: 22997568; PMCID: PMC3446730.
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J Amino Acids. 2012;2012:493209. doi: 10.1155/2012/493209. Epub 2012 Sep 11.

Polyamine-Induced Rapid Root Abscission in Azolla pinnata.

Journal of amino acids

Sushma Gurung, Michael F Cohen, Jon Fukuto, Hideo Yamasaki

Affiliations

  1. Faculty of Science, University of the Ryukyus, Nishihara 903-0213, Japan.

PMID: 22997568 PMCID: PMC3446730 DOI: 10.1155/2012/493209

Abstract

Floating ferns of the genus Azolla detach their roots under stress conditions, a unique adaptive response termed rapid root abscission. We found that Azolla pinnata plants exhibited dose-dependent rapid root abscission in response to the polyamines spermidine and spermine after a substantial time lag (>20 min). The duration of the time lag decreased in response to high pH and high temperature whereas high light intensity increased the time lag and markedly lowered the rate of abscission. The oxidation products of polyamines, 1,3-diaminopropane, β-alanine and hydrogen peroxide all failed to initiate root abscission, and hydroxyethyl hydrazine, an inhibitor of polyamine oxidase, did not inhibit spermine-induced root abscission. Exposure of A. pinnata to the polyamines did not result in detectable release of NO and did not affect nitrite-dependent NO production. The finding of polyamine-induced rapid root abscission provides a facile assay for further study of the mode of action of polyamines in plant stress responses.

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