高抗性淀粉水稻的遗传育种研究进展

    Advances in Genetic Breeding of Rice with High Resistant Starch

    • 摘要: 抗性淀粉作为一种新型膳食纤维,可以控制血糖和胆固醇水平、改善肠道健康,成为近年来功能性食品和作物遗传领域的研究热点。水稻是我国重要的粮食作物,选育高抗性淀粉水稻品种对改善我国以稻米为主食人群的营养与健康状况,及满足人们未来对健康生活的需求具有重要意义。水稻中抗性淀粉含量主要由少数主效淀粉合成基因与较多微效基因共同调控,不同主效基因的等位组合对抗性淀粉含量的影响存在差异。目前,生产上已经培育出一批抗性淀粉含量高达10% 的水稻品种,但抗性淀粉含量的增高会伴随米饭蒸煮食味品质降低,严重影响消费者的食用意愿,研究和培育口感较好的高抗性淀粉水稻品种是未来重点研究的重点与难点。同时,选育复合型(如高抗性淀粉、高花青素或低谷蛋白等)多功能水稻,也是未来抗性淀粉的选育方向。基因编辑、多基因聚合等多种生物技术育种手段与传统杂交育种相结合,可提高抗性淀粉水稻品种的选育效率。该文对水稻抗性淀粉类型、生物合成途径中主要的相关基因及高抗性淀粉水稻品种选育进展进行综述,并对未来研究的重点与方向进行展望,以期为高抗性淀粉水稻的选育与产业化提供一定的借鉴。

       

      Abstract: As a new type of dietary fiber, resistant starch can control blood sugar and cholesterol levels and improve intestinal health, and has become a research hotspot in the fields of functional food and crop genetics in recent years. Rice is an important food crop in China, and breeding rice varieties with high resistant starch is of great significance to improve the nutrition and health status of people who depend on rice as their staple food and meet the demand for healthy life in the future. The content of resistant starch in rice is mainly regulated by a few major starch synthesized genes and many minor genes, and the allelic combinations of different major genes also have significant effects on the content of resistant starch. At present, some rice varieties with resistant starch content as high as 10% have been cultivated in production, however, the increase of resistant starch content is often accompanied by the decrease of rice cooking taste quality, which seriously affects consumers' willingness to eat. It will be the focus and difficulty of future research to cultivate high resistant starch rice varieties with good taste. At the same time, breeding multi-functional rice with multiple compound functions (such as high resistant starch, high anthocyanin or low protein, etc.) is also a direction of resistant starch breeding in the future. Gene editing, gene pyramiding and other biotechnological breeding methods combined with traditional cross breeding can improve the breeding efficiency of starch resistant rice varieties. In this paper, the types of resistant starch in rice, the main genes related to biosynthesis pathway and the progress in breeding of high resistant starch rice were reviewed, and the focus and direction of future research were prospected, with an aim to provide some references for the breeding and industrialization of high resistant starch rice.

       

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