Nfluence of Jasmonic Acid on Endogenous Gibberellin and Abscisic Acid in Salt-Stressed Chard Plant

ournal of Environmental Biology May 2009, 30(3) 333-338 (2009)

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Influence of jasmonic acid on endogenous gibberellin and

abscisic acid in salt-stressed chard plant

S.K. Kim1

, E.Y. Sohn2

, G.J. Joo2

and I.J. Lee*

2

1

Institute for Bioresources Research, Gyeongbuk Provincial Agricultural Technology Administration, Andong 760-891, Korea

2

College of Agricultural and Life Sciences, Kyungpook National University, Daegu 702-701, Korea

(Received: August 25, 2007; Revised received: December 29, 2007; Accepted: January 10, 2008)

Abstract: The endogenous gibberellin (GA) and abscisic acid (ABA) contents as an effect of different application times of jasmonic acid

(JA) in chard seedlings exposed to salt stress were investigated. Endogenous ABA content was increased by JA treatment after NaCl

treatment, rather than after JA application before NaCl treatment. JA application after NaCl treatment caused higher ABA content than

treatment with 160 mM NaCl alone. Total gibberellin content decreased after NaCl stress, but NaCl-reduction in total GA contents

counteracted by exogenous JA. Total endogenous GA contents were increased in JA treatment after NaCl and were highest at 24 hr of JA

application before NaCl exposure. JA treatment promoted the increase of dry weight compared to chard plant exposed to 160 mM NaCl.

Thus, JA presumably induces gibberellin biosynthesis showing the promotion of growth and dry weight of chard plants under salt stress.

Key words: Salt stress, Gibberellins, Abscisic acid, Jasmonic acid, Chard plant

PDF of full length paper is available with author (*ijlee@knu.ac.kr)

Introduction

Plants are often exposed to adverse environmental factors

such as high soil salinity or drought. Reduction in the growth of plants

exposed to saline environments could be due to either the effects of...