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AOBPreview originally published online on August 14, 2008
Annals of Botany 2008 102(4):551-559; doi:10.1093/aob/mcn141
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© The Author 2008. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Reductions in Maize Root-tip Elongation by Salt and Osmotic Stress do not Correlate with Apoplastic O2•– Levels

Dolores Bustos1, Ramiro Lascano1, Ana Laura Villasuso2, Estela Machado2, María Eugenia Senn1, Alicia Córdoba1 and Edith Taleisnik1,*

1 IFFIVE-INTA, Camino a 60 Cuadras Km 5 1/2, X5020ICA Córdoba, Argentina
2 Química Biológica, FCEFQN, Universidad Nacional de Río Cuarto, X5804BYA Río Cuarto, Córdoba, Argentina

* For correspondence. E-mail etaleisnik{at}correo.inta.gov.ar or etaleisnik{at}yahoo.com

Received: 1 May 2008    Returned for revision: 28 May 2008    Accepted: 3 July 2008    Published electronically: 15 August 2008

Background and Aims: Experimental evidence in the literature suggests that O2•– produced in the elongation zone of roots and leaves by plasma membrane NADPH oxidase activity is required for growth. This study explores whether growth changes along the root tip induced by hyperosmotic treatments in Zea mays are associated with the distribution of apoplastic O2•–.

Methods: Stress treatments were imposed using 150 mM NaCl or 300 mM sorbitol. Root elongation rates and the spatial distribution of growth rates in the root tip were measured. Apoplastic O2•– was determined using nitro blue tetrazolium, and H2O2 was determined using 2', 7'-dichlorofluorescin.

Key Results: In non-stressed plants, the distribution of accelerating growth and highest O2•– levels coincided along the root tip. Salt and osmotic stress of the same intensity had similar inhibitory effects on root elongation, but O2•– levels increased in sorbitol-treated roots and decreased in NaCl-treated roots.

Conclusions: The lack of association between apoplastic O2•– levels and root growth inhibition under hyper-osmotic stress leads us to hypothesize that under those conditions the role of apoplastic O2•– may be to participate in signalling processes, that convey information on the nature of the substrate that the growing root is exploring.

Key words: Root tip growth, Zea mays, salt stress, reactive oxygen species, ROS


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