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Chinese Agricultural Science Bulletin ›› 2019, Vol. 35 ›› Issue (31): 1-10.doi: 10.11924/j.issn.1000-6850.casb18080056

Special Issue: 生物技术 水稻

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Identification and Screening of Rice Quality Characteristics of Introgression Lines Carrying African Rice Genes

  

  • Received:2018-08-13 Revised:2018-12-21 Accepted:2019-01-24 Online:2019-11-04 Published:2019-11-04

Abstract: It is becoming an important goal to improve the rice quality characteristic in the modern rice breeding work. Exploring of the quality potential for the newly bred African rice introgression lines would be an important foundation for their further utilization in the breeding of new rice cultivars with good quality. In this study, 12 rice quality characteristics of 50 African rice introgression lines were investigated, and the integrate quality performance of the tested materials were further assessed and screened with correlation analysis, clustering, and typical discriminant analysis methods. Our results showed that all introgression lines performed high brown rice rate (≥74.19%), high milled rice rate (≥67.83%), high length-width ratio (≥2.79), and low moisture content(≤13.03%); appropriate rice amylose content (17.00-22.00%) were observed for most (26/50) of the introgression lines according to the national standard of good quality in milled rice. The Fifty introgression lines were clustered to 5 groups based on DIST distances calculating with 12 rice quality characteristics, in which group I performed optimal rice quality characteristics. The typical discriminant analysis revealed distinct grouping results which is identical with that of clustering method. Two typical discriminant functions were obtained, and can explain 89.5% and 7.2% of phenotypic variation in all the 12 characteristics, respectively. The appearance quality including chalky rice rate and length-width ratio were highlighted in the two functions, which could be the key traits to be improved in the further study. The newly selected 50 introgression lines of African cultivated rice have good advantages on further research and application potential in terms of brown rice rate, milled rice rate, length-width ratio and amylose content; the chalky grain rate and aspect ratio can be the important indicators for rice quality improvement using introgression lines of African cultivated rice. Our results will provide a basis for the breeding of new rice varieties with high yield and excellent quality.

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