Journal Article

Possible Involvement of Greening in Cell Growth of <i>Suaeda japonica</i> under Salt Stress

Shizufumi Tanimoto, Yoko Itoh and Takaharu Yokoishi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 2, pages 129-132
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029142
Possible Involvement of Greening in Cell Growth of Suaeda japonica under Salt Stress

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Suaeda japonica, a member of the family Chenopodiaceae, is a halophyte that grows on the shores of the Ariake Sea in Japan. Using yellowish and selected green callus tissues of S. japonica, we examined the correlation between cell growth and glycinebetaine content, as well as the activity of betaine aldehyde dehydrogenase (BADH), under salt stress. Although the growth of yellowish callus tissues was markedly inhibited by 0.1 M NaCl, that of green callus tissues was not. However, in 0.3 M NaCl, the fresh weight of green callus tissues was decreased by 15%. Both the endogenous level of glycinebetaine and the activity of BADH in yellowish callus tissues were very low, but green callus tissues contained very high levels of glycinebetaine and high BADH activity. The activity in green callus increased significantly with increases in the concentration of NaCl. The increase in levels of Chl was also observed, but the increase occurred earlier than that in the level of glycinebetaine. Functional development of chloroplasts (an increase in the level of Chl) seems to be involved in the increase in the activity of BADH, and the resultant increase in levels of glycinebetaine seems to facilitate callus growth under salt stress.

Keywords: Betaine aldehyde dehydrogenase (EC 1.2.1.8); Callus growth; Glycinebetaine; Greening; Salt stress; Suaeda japonica

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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