一个水稻脆秆突变体bc21的鉴定和基因定位  

Identification and gene mapping of brittle culm mutant bc21 in rice

作　　者：戴文慧 朱琪 张小芳 吕沈阳 项显波 马涛 陈宇杰 朱世华[1] 丁沃娜[1] DAI Wen-Hui;ZHU Qi;ZHANG Xiao-Fang;LYU Shen-Yang;XIANG Xian-Bo;MA Tao;CHEN Yu-Jie;ZHU Shi-Hua;DING Wo-Na(College of Science and Technology,Ningbo University,Ningbo 315212,Zhejiang,China;School of Marine Science,Ningbo University,Ningbo 315211,Zhejiang,China;Pingyang Administration for Market Regulation,Wenzhou 325400,Zhejiang,China)

机构地区：[1]宁波大学科学技术学院,浙江宁波315212 [2]宁波大学海洋学院,浙江宁波315211 [3]平阳县市场监督管理局,浙江温州325400

出　　处：《作物学报》2023年第5期1426-1431,共6页Acta Agronomica Sinica

基　　金：国家自然科学基金项目(32071981);宁波市自然科学基金重点项目(202003N4016)资助。

摘　　要：利用甲基磺酸乙酯(EMS)诱变籼稻Kasalath获得一个脆秆突变体bc21。表型分析发现,该突变体的茎秆及叶片均易折断,且该脆性表型在苗期开始表现,至成熟期时最显著。茎秆机械强度分析表明, bc21茎秆的抗折力、拉伸力显著下降。树脂切片及扫描电镜观察发现, bc21茎秆的厚壁组织细胞空隙增多,细胞壁明显变薄。茎秆细胞壁组分含量分析表明,与野生型相比, bc21的纤维素含量降低36.60%,半纤维素和木质素含量分别升高23.08%和26.06%。经遗传分析得出,bc21的脆性性状由隐性单基因控制。利用SSR标记和自行设计的STS标记将BC21基因定位于水稻第6号染色体STS标记STS2和STS3之间约52.9kb的范围内,该区间内没有已报道的水稻脆性相关基因,表明BC21可能是1个新的水稻脆秆基因,为进一步揭示水稻茎秆机械强度的调控机制提供了材料支撑。A brittle culm mutant bc21 was obtained by mutagenesis of indica rice Kasalath with ethyl methanesulfonate(EMS) .Phenotypic analysis revealed that the mutant displayed both brittle culm and leaf phenotypes, which began to manifest at seedling stage and were most pronounced at mature stage. The mechanical strength analysis showed that the breaking resistance and tensile force of bc21 stems decreased significantly. Resin sections and scanning electron microscope observation showed that the sclerenchyma cells of bc21 culms had increased voids and thinner cell walls. Compared with the wild type, the cell wall component of stems revealed that the cellulose content of bc21 decreased by 36.60%, and the hemicellulose and lignin contents increased by 23.08% and 26.06%, respectively. Genetic analysis indicated that the brittle trait of bc21 was controlled by a single recessive gene.Using SSR markers and self-designed STS markers, BC21 was located in a 52.9 kb region between the markers STS2 and STS3on chromosome 6, and there was no previously reported rice brittleness-related gene within this region, indicating that BC21might be a new brittle culm gene in rice. This study will provide material support for further dissection of the regulation mechanism of mechanical strength of rice stems.

关 键 词：水稻 脆秆突变体 细胞壁 纤维素 基因定位 

分 类 号：S511[农业科学—作物学]