【摘要】 以湘早籼24、湘早籼143和自选1号3个早籼品种为研究对象,早、中、晚3季栽培,通过分析抽穗后单株主穗籽粒干物质积累量、籽粒颖壳和子房的叶绿素与类胡萝卜素的动态变化,探讨稻米色素形成的规律,确定籽粒灌浆、稻米色素沉积、米质形成的最佳切合时期和保健色米的收获适期。结果表明,水稻灌浆期籽粒的干重随着灌浆的进行呈逐渐上升趋势,早季栽培的水稻籽粒干重的增加速率快,灌浆时间短;而晚季栽培的水稻籽粒干重的增加速率较缓,灌浆时间长,成熟后籽粒干重比早季栽培的重。收获期对色素的影响最大,水稻籽粒子房色素含量的变化趋势与颖壳色素含量的变化趋势相同,且延后于颖壳色素含量的变化。研究表明保健色稻收获适期早、中、晚季稻分别在抽穗后25、20和25d。更多还原

【Abstract】 In order to study the dynamic changes law of the rice grain pigments formation,and determine the optimal integrated stage of rice grain-setting,formation of grain pigments,and the best optimal harvest date of the health colorful grain,the rice varieties Xiangzaoxian 24,Xiangzaoxian 143,and Zixuan 1 were used to analyze the grain dry weight, chlorophyll and carotenoid contents of hull and ovary of grain in a main panicle of the single-plant after heading. The results showed that the dry weight of rice grain increased with the process of rice grain-setting. The harvest stage of the health colorful grain had the most important effect on the grain pigments,and the optimal harvest stage of the early, middle and late-cropping rice were 25,20 and 25 days after heading,respectively.更多还原