Abstract: With high-yield varieties Yangdao 6 and Lvhan 1 build 192 recombinant inbred lines as the experimental material, the eight lodging resistance traits (plant height, fresh weight, bending force, base transverse area, base area of the medullary cavity, basal stem wall area, wall thickness and lodging index) and three yield related traits (spike length, weight per panicle and effective panicle number) were selected for correlation analysis and QTL mapping. A total of 14 antiinversion related QTLS were identified, which were distributed on chromosome 1, 2, 3, 5, 7, 8, 10 and 12. LOD ranged from 3.02 to 14.78, additive effect ranged from -5.22 to 2.36, and QTL contribution rate was 3.36% to 20%. Eight yield related QTLS were distributed on chromosome 1, 3, 5 and 12, with LOD ranging from 3.1 to 9.43, additive effect value ranging from -12.55 to 4.58, and QTL contribution rate ranging from 3.93% to 14.53%. There was significant negative correlation between yield traits and lodging resistance, and many QTLs appeared in clusters. In this study, QTL mapping and correlation analysis were conducted for lodging resistance traits and yield traits, and the projection area method was adopted instead of wall thickness as an evaluation index to comprehensively excavate excellent QTL loci, providing scientific basis for breeding high yield and lodging resistance rice varieties.

Key words: rice, lodging resistance, yield, association analysis, QTL mapping, Linkage map