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Published on March 19, 2008; 10.1104/pp.107.114256

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Received December 10, 2007
Accepted March 7, 2008

Further characterization of a rice AGL12-group MADS-box gene, OsMADS26

Shinyoung Lee , Young-Min Woo , Sung-Il Ryu , Young-Duck Shin , Woo Taek Kim , Ky Young Park , In-Jung Lee , and Gynheung An *

Department of Life Science and National Research Laboratory of Plant Functional Genomics, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea; Department of Biology, College of Science, Yonsei University, Seoul 120-749, Republic of Korea; Department of Biology, Sunchon National University, Sunchon 540-742, Republic of Korea; Division of Plant Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 702-701, Korea

* Corresponding author; email: genean{at}postech.ac.kr.

Plant MADS-box genes can be divided into 11 groups. Genetic analysis has revealed that most of them function in flowering-time control, reproductive organ development, and vegetative growth. Here, we elucidated the role of OsMADS26, a member of the AGL12 group. Transcript levels of OsMADS26 were increased, in an age-dependent manner, in the shoots and roots. Transgenic plants of both rice and Arabidopsis over-expressing this gene manifested phenotypes related to stress responses, such as chlorosis, cell death, pigment accumulation, and defective root/shoot growth. In addition, apical hook development was significantly suppressed in Arabidopsis. Plants transformed with the OsMADS26-glucocorticoid receptor (GR) fusion construct displayed those stress-related phenotypes when treated with dexamethasone (DEX). Microarray analyses using this inducible system showed that biosynthesis genes for jasmonate, ethylene, and reactive oxygen species as well as putative downstream targets involved in the stress-related process were up-regulated in OsMADS26-overexpressing plants. These results suggest that OsMADS26 induces multiple responses that are related to various stresses.






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