We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Polyamine-Induced Rapid Root Abscission in Azolla pinnata.
- Authors
Gurung, Sushma; Cohen, Michael F.; Fukuto, Jon; Yamasaki, Hideo
- 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.
- Subjects
ABSCISSION (Botany); PLANT roots; PHYSIOLOGICAL effects of polyamines; AZOLLA pinnata; WATER ferns; EFFECT of stress on plants; PHYSIOLOGICAL effects of hydrogen-ion concentration
- Publication
Journal of Amino Acids, 2012, p1
- ISSN
2090-0112
- Publication type
Article
- DOI
10.1155/2012/493209