Characterization and cloning of SMALL GRAIN 4, a novel DWARF11 allele that affects brassinosteroid biosynthesis in rice
文献类型: 外文期刊
作者: Zhenyuan Shi ; Yuchun Rao +; Jie Xu +; Shikai Hu ; Yunxia Fang ; Haiping Yu ; Jiangjie Pan ; Ruifang Liu ; Deyong Ren ; Xiaohu Wang ; Yangzhou Zhu ; Li Zhu ; Guojun Dong ; Guangheng Zhang ; Dali Zeng ; Longbiao Guo ; Jiang Hu *; Qian Qian *
作者机构:
关键词: Brassinosteroid;Gene cloning;Oryza sativa L.;Rice mutant
期刊名称: Science Bulletin
ISSN: 2095-9273
年卷期: 2015 年 60 卷 10 期
页码:
收录情况: JCR(2021版) ; EI(2021版) ; CSCD(2020-2021年度)
摘要: Brassinosteroids (BRs) are important hormones that regulate plant development and physiology. Substantial progresses have been made in BR-related studies, and especially an increasing number of new genes involved in BR biosynthesis have been identified. Here, we characterize a BR-related rice mutant, small grain 4 (sg4), obtained from callus culture of japonica cultivar Nipponbare. This mutant showed multiple phenotypes such as dark green, rugose erect leaves and small round grains. It was higher than the wild type, different from the majority of BR- and gibberellin-related mutants. Genetic analysis showed that the mutant phenotypes are controlled by a single recessive locus. The gene was fine-mapped to a 90.7-kb interval with 1,100 F-2 recessive individuals by means of map-based cloning. Totally 11 open reading frames were found in this interval, only one of which was detected with an 8-bp insertion in the 5'UTR region by sequencing. Functional complementation test revealed that a DWARF11 allele, LOC_Os04g39430, is answer for the mutant phenotype of sg4. Tissue-specific response to BR and decreased expression levels of BR biosynthetic genes suggest that sg4 is a weak BR-deficient mutant. These results are beneficial to understanding the physiological action of sg4 in a more comprehensive way.
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