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Genetic variability of oxalate oxidase activity and elongation in water-stressed primary roots of diverse maize and rice lines

Permanent URL:
http://handle.nal.usda.gov/10113/56971
Abstract:
A previous study of maize primary roots under water stress showed pronounced increases in oxalate oxidase activity and apoplastic hydrogen peroxide in the apical region of the growth zone where cell elongation is maintained. We examined whether increased oxalate oxidase activity in water-stressed roots is conserved across diverse lines of maize and rice. The maize lines exhibited varied patterns of activity, with some lines lacking activity in the apical region. Moreover, none of the rice lines showed activity in the apical region. Also, although the genotypic response of root elongation to water stress was variable in both maize and rice, this was not correlated with the pattern of oxalate oxidase activity. Implications of these findings for root growth regulation under water stress are discussed.
Author(s):
Priyamvada Voothuluru , Hallie J. Thompson , Sherry A. Flint-Garcia , Robert E. Sharp
Subject(s):
Oryza sativa , Zea mays , cell growth , corn , enzyme activity , genetic variation , hydrogen peroxide , oxidoreductases , phenotypic variation , plant response , plant stress , plant-water relations , rice , root growth , roots , stress response , water stress
Source:
Plant Signaling & Behavior 2013 v.8 no.3
Language:
English
Year:
2013
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.