期刊论文详细信息
Journal of genetics
Map-based cloning and expression analysis of BMR-6 in sorghum
Lihua Wang1  Yanlong Liu1  Jieqin Li1  Qiuwen Zhan11 
[1] College of Agriculture, Anhui Science and Technology University, Fengyang 233100, People’s Republic of China$$
关键词: bmr-6;    cinnamyl alcohol dehydrogenase;    lignin biosynthesis;    sorghum.;   
DOI  :  
学科分类:生物科学(综合)
来源: Indian Academy of Sciences
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【 摘 要 】

Brown midrib mutants in sorghum are associated with reduced lignin content and increased cell wall digestibility. In this study, we characterized a bmr-6 sorghum mutant, which shows reddish pigment in the midrib and stem after the fifth-leaf stage. Compared to wild type, Kalson lignin content of bmr-6 is decreased significantly. We used histological analysis to determine that the mutant exhibited a modified pattern of lignin staining and found an increased polysaccharide content. We cloned BMR-6 gene, a gene encoded a cinnamyl alcohol dehydrogenase (CAD), using a map-based cloning approach. Genetic complementation confirmed that CAD is responsible for the BMR-6 phenotype. BMR-6 gene was expressed in all tested sorghum tissues, with the highest being in midrib and stem. Transient expression assays in Nicotiana benthamiana leaves demonstrated cytomplasmic localization of BMR-6. We found that the expression level of bmr-6 was significantly decreased in the mutant but expression of SbCAD3 and SbCAD5 were significantly increased. Our results indicate that BMR-6 not only affects the distribution of lignin but also the biosynthesis of lignin in sorghum.

【 授权许可】

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