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First published online August 8, 2003; 10.1105/tpc.011775

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The Plant Cell, Vol. 15, 2020-2031, September 2003, Copyright © 2003,
American Society of Plant Biologists

BRITTLE CULM1, Which Encodes a COBRA-Like Protein, Affects the Mechanical Properties of Rice Plants

Yunhai Li1,a, Qian Qian1,b, Yihua Zhou1,a, Meixian Yanb, Lei Suna, Mu Zhanga, Zhiming Fua, Yonghong Wanga, Bin Hanc, Xiaoming Panga, Mingsheng Chena and Jiayang Li2,a

a Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
b China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310006, China
c National Center for Gene Research, Chinese Academy of Sciences, Shanghai 200233, China

2 To whom correspondence should be addressed. E-mail jyli{at}genetics.ac.cn; fax 86-10-64873428

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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