Plant Physiol. Illumina
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
QUICK SEARCH:   [advanced]


     

Plant Physiology Preview
Published on February 11, 2009; 10.1104/pp.108.134684

OPEN ACCESS ARTICLE
This Article
Free via Open Access: OA
Right arrow Full Text (Plant Physiology Preview (PDF))
Right arrow Supplemental Data
Right arrowOA All Versions of this Article:
149/4/1751    most recent
pp.108.134684v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Web of Science (1)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kim, E. H.
Right arrow Articles by Kim, J.-K.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kim, E. H.
Right arrow Articles by Kim, J.-K.
Agricola
Right arrow Articles by Kim, E. H.
Right arrow Articles by Kim, J.-K.

Received December 18, 2008
Accepted February 4, 2009

Methyl Jasmonate Reduces Grain Yield by Mediating Stress Signals to Alter Spikelet Development in Rice

Eun Hye Kim , Youn Shic Kim , Su-Hyun Park , Yeon Jong Koo , Yang Do Choi , Yong-Yoon Chung , In-Jung Lee , and Ju-Kon Kim *

School of Biotechnology and Environmental Engineering, Myongji University, Yongin, 449-728, Korea; School of Agricultural Biotechnology, Seoul National University, Seoul, 151-921, Korea; School of Life Science and Biotechnology, Korea University, Seoul, 136-701, Korea; Department of Plant-Life Science, Kyungbuk National University, Daegu, 702-701, Korea

* Corresponding author; email: jukon306{at}gmail.com.

Jasmonic acid (JA) is involved in plant development and the defense response. Transgenic overexpression of the Arabidopsis gene jasmonic acid carboxyl methyltransferase (AtJMT) linked to the Ubi1 promoter increased levels of methyl jasmonate (MeJA) by 6-fold in young panicles. Grain yield was greatly reduced in Ubi1:AtJMT plants due to lower numbers of spikelets and lower filling rates than were observed for nontransgenic (NT) controls. Ubi1:AtJMT plants had altered numbers of spikelet organs, including the lemma/palea, lodicule, anther, and pistil. The loss of grain yield and alteration in spikelet organ numbers was reproduced by treating NT plants with exogenous MeJA, indicating that increased levels of MeJA in Ubi1:AtJMT panicles inhibited spikelet development. Interestingly, MeJA levels were increased by 19-fold in young NT panicles upon exposure to drought conditions, resulting in a loss of grain yield that was similar to that observed in Ubi1:AtJMT plants. Levels of abscisic acid (ABA) were increased by 1.9- and 1.4-fold in Ubi1:AtJMT and drought-treated NT panicles, respectively. The ABA increase in Ubi1:AtJMT panicles grown in non-drought conditions suggests that MeJA, rather than drought stress, induces ABA biosynthesis under drought conditions. By using microarray and qPCR analyses, we identified 7 genes that were regulated in both Ubi1:AtJMT and drought-treated NT panicles. Two genes, OsJMT1 and OsSDR, are involved in MeJA and ABA biosynthesis, respectively. Overall, our results suggest that plants produce MeJA during drought stress, which in turn stimulates the production of ABA, together leading to a loss of grain yield.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 2009 by the American Society of Plant Biologists