论文部分内容阅读
干旱是当前水稻实现高产稳产所面临的重要限制因子之一,增强水稻深根系是提高水稻抗旱性的重要途径。以“全球水稻分子育种计划”中的177份优异种质为试验材料,利用改良的“篮子法”鉴定了55d秧龄时的株高、分蘖数、深根数、浅根数、总根数以及深根比,并分析了这些性状在群体中的分布特征。结果表明,这些农艺性状在群体中都呈正态分布,存在丰富的表型变异。水稻品种间的深根比差异较大,大部分属于浅根系材料,只有沈农265、Lemont、Yen Fang Chu和原粳7号4个材料的深根比超过了40%。对这些优异资源农艺性状的了解,为在节水抗旱稻育种中深入利用这些亲本及其构建的导入系群体提供理论依据。
Drought is one of the most important limiting factors to achieve high and stable rice yield. Enhancing the deep root system of rice is an important way to improve the drought resistance of rice. Using 177 excellent germplasm resources in the “Global Rice Molecular Breeding Program” as test material, the plant height, tiller number, deep root number, shallow root number, total root number, Root number and deep root ratio, and analyzed the distribution characteristics of these traits in the population. The results showed that these agronomic traits in the population were normal distribution, there are abundant phenotypic variation. The deep root ratio among rice cultivars was quite different, mostly belonging to the shallow root materials. Only the deep roots ratio of Shennong 265, Lemont, Yen Fang Chu and Yuanjing 7 exceeded 40%. The understanding of these excellent agronomic traits provides a theoretical basis for further utilization of these parents and the population of introgressed lines they are constructed in water-saving and drought-resistant rice breeding.