Plant Cell Advance Online Publication
Published on August 8, 2003; 10.1105/tpc.011775
Received March 8, 2003
Accepted June 19, 2003
BRITTLE CULM1, Which Encodes a COBRA-Like Protein, Affects the Mechanical
Properties of Rice Plants
Yunhai Li 1, Qian Qian 2, Yihua Zhou 1, Meixian Yan 2, Lei Sun 1, Mu Zhang 1, Zhiming Fu 1, Yonghong Wang 1, Bin Han 3, Xiaoming Pang 1, Mingsheng Chen 1, and Jiayang Li 1*
1
Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing
100101, China
2
China National Rice Research Institute, Chinese Academy of Agricultural Sciences,
Hangzhou 310006, China
3
National Center for Gene Research, Chinese Academy of Sciences, Shanghai 200233,
China
* To whom correspondence should be addressed. E-mail: jyli{at}genetics.ac.cn.
Plant mechanical strength is an important agronomic trait. To understand the molecular
mechanism that controls the plant mechanical strength of crops, we characterized
the classic rice mutant brittle culm1 (bc1) and isolated BC1
using a map-based cloning approach. BC1, which encodes a COBRA-like
protein, is expressed mainly in developing sclerenchyma cells and in vascular bundles
of rice. In these types of cells, mutations in BC1 cause not only a reduction
in cell wall thickness and cellulose content but also an increase in lignin level,
suggesting that BC1, a gene that controls the mechanical strength of monocots,
plays an important role in the biosynthesis of the cell walls of mechanical tissues.
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