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A missense mutation in the transmembrane domain of CESA9 affects cell wall biosynthesis and plant growth in rice

文献类型： 外文期刊

作者： Wang, Daofeng 1 ; Yuan, Shoujiang 3 ; Yin, Liang 3 ; Zhao, Jinfeng 2 ; Guo, Baotai 4 ; Lan, Jinhao 1 ; Li, Xueyong 2 ;

作者机构： 1.Qingdao Agr Univ, Coll Agron & Plant Protect, Qingdao 266109, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

3.Shandong Rice Res Inst, Jinan 250100, Peoples R China

4.Qingdao Agr Univ, Coll Life Sci, Qingdao 266109, Peoples R China

关键词： Rice; Brittle culms; CESA; Cellulose

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2012 年 196 卷

页码：

收录情况： SCI

摘要： Rice is a model organism in poaceae plants to study cell wall biosynthesis. In this study, a mutant S1-60 isolated from an EMS mutagenized japonica cultivar Nipponbare, is characterized by brittle culms that can be easily broken by bending. The reduction in mechanical strength was due to defect in thickening of the sclerenchyma cell wall. The amount of cellulose in S1-60 culms was reduced to 44.7% of that of wild-type plants. Besides, the mutant also exhibited pleiotropic phenotypes, such as dwarfism and partial sterility. Genetic analysis and map-based cloning showed that all the phenotype of S1-60 mutant was caused by a recessive point mutation in the OsCESA9 gene, which encodes the cellulose synthase A subunit 9. This yet uncharacterized missense mutation changed the highly conserved G905 to D at the beginning of the fifth transmembrane domain. The OsCESA9 gene is predominantly expressed in the culms of mature stage plants, consistent with the brittle phenotype in the culm. These results indicate that OsCESA9 plays an important role in cell wall biosynthesis and plant growth. (C) 2012 Elsevier Ireland Ltd. All rights reserved.

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