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The Plant Cell, Vol. 12, 871884, June 2000, www.plantcell.org 2000 American Society of Plant Physiologists leafy hull sterile1 Is a Homeotic Mutation in a Rice MADS Box
 

Summary: The Plant Cell, Vol. 12, 871884, June 2000, www.plantcell.org 2000 American Society of Plant Physiologists
leafy hull sterile1 Is a Homeotic Mutation in a Rice MADS Box
Gene Affecting Rice Flower Development
Jong-Seong Jeon,a Seonghoe Jang,a Sichul Lee,a Jongmin Nam,a Chanhong Kim,a Sang-Hee Lee,b
Yong-Yoon Chung,b Seong-Ryong Kim,c Yeon Hee Lee,d Yong-Gu Cho,e and Gynheung Ana,1
a National Research Laboratory of Plant Functional Genomics, Division of Molecular Life Sciences, Pohang University of
Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
b Department of Biology, Korea University, Seoul 136-701, Republic of Korea
c Department of Life Science, Sogang University, Seoul 121-742, Republic of Korea
d Department of Cytogenetics, National Institute of Agricultural Science and Technology, Suweon 441-707, Republic of Korea
e Department of Agronomy, Chungbuk National University, Cheongju 361-763, Republic of Korea
Rice contains several MADS box genes. It has been demonstrated previously that one of these genes, OsMADS1 (for
Oryza sativa MADS box gene1), is expressed preferentially in flowers and causes early flowering when ectopically ex-
pressed in tobacco plants. In this study, we demonstrated that ectopic expression of OsMADS1 in rice also results in
early flowering. To further investigate the role of OsMADS1 during rice flower development, we generated transgenic
rice plants expressing altered OsMADS1 genes that contain missense mutations in the MADS domain. There was no
visible alteration in the transgenic plants during the vegetative stage. However, transgenic panicles typically exhibited
phenotypic alterations, including spikelets consisting of elongated leafy paleae and lemmas that exhibit a feature of
open hull, two pairs of leafy palea-like and lemma-like lodicules, a decrease in stamen number, and an increase in the
number of carpels. In addition, some spikelets generated an additional floret from the same rachilla. These characteris-

  

Source: An, Gynheung - Department of Life Science, Pohang University of Science and Technology

 

Collections: Biotechnology; Biology and Medicine