Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Biochemistry & Molecular Biology Regular Papers
Exogenous Proline and Glycinebetaine Suppress Apoplastic Flow to Reduce Na+ Uptake in Rice Seedlings
Muhammad Abdus SOBAHANCarlos Raul ARIASEiji OKUMAYasuaki SHIMOISHIYoshimasa NAKAMURAYoshihiko HIRAIIzumi C. MORIYoshiyuki MURATA
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2009 Volume 73 Issue 9 Pages 2037-2042

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Abstract

The application of exogenous proline and glycinebetaine (betaine) confers salt tolerance on plants under salt stress. The effects of exogenous proline and betaine on apoplastic flow in rice plants under saline conditions were investigated using trisodium-8-hydroxy-1,3,6-pyrenetrisulphonic acid (PTS), an apoplastic tracer. Rice plants took up more PTS under light conditions than under dark conditions. Salt stress increased PTS uptake and Na+ content of rice leaves, but did not affect K+ content, resulting in a lower K+/Na+ ratio. Addition of proline or betaine to the saline medium suppressed Na+-induced PTS uptake and Na+ accumulation, while the K+ content was slightly increased, which led to a high K+/Na+ ratio under saline conditions. These results suggest that exogenous proline and betaine suppressed Na+-enhanced apoplastic flow to reduce Na+ uptake in rice plants.

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© 2009 by Japan Society for Bioscience, Biotechnology, and Agrochemistry
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