Characterization and fine mapping of an early senescence mutant (es-t) in Oryza sativa L.
Characterization and fine mapping of an early senescence mutant (es-t) in Oryza sativa L.作者机构：State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China College of Life and Environment Sciences Hangzhou Normal University Hangzhou 310036 China
出 版 物：《Chinese Science Bulletin》 (Chinese Science Bulletin)
年 卷 期：2011年第56卷第23期
页 面：2437-2443页
核心收录：
基 金：supported by the National Special Program for Research and Transgenic Plants (2011ZX08009-003) the National Key Basic Research Program of China (2007CB10920203) the National Natural Science Foundation of China (30971760)
主 题：ES 衰老 早期 精细定位 突变 水稻 扫描电子显微镜 表征
摘 要：An es-t (early senescence-temporary) mutant, produced by ethylene methylsulfonate treatment of strain Nipponbare, was identified in rice. The leaves of es-t appeared yellow at the seedling stage, and had decreased chlorophyll content. Rust spots were found during growth in es-t, especially at the leaf margin and tip. The plants showed a typical early-senescence phenotype at the milky stage. The leaf surface of es-t appeared smoother than wild-type leaves under a scanning electron microscope, because the leaves lack siliceous protuberances around the stoma. Chloroplasts grow abnormally and are filled with many starch grains in es-t. Paraffin section analysis showed that the development of the sclerenchyma cells and vascular bundles were also abnormal in es-t. Genetic analysis indicated that es-t was controlled by a recessive gene, which was finely mapped to a 42-kb interval on chromosome 5. These results will facilitate the positional cloning and functional studies of the gene.
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