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Effects of Population Improvement of BHO for High Oil Content Maize and Selection Method Evaluation

Cao Yongguo; Kong Fanling; Song Tongming(College of Plant Science & Technology, CAU)  
Different cycles of BHO population were grown in 1992 and 1993 with RCBD. Oilcontent and other 15 quality and agronomic traits were measured. Changes along with selec-tion on all traits were analyzed. Phenotypic correlation coefficients between oil content andother traits were calculated. The selection effects were evaluated and scvcral selection meth-ods were compared, and following results were obtained: ①The oil content had increasedfrom 4. 81 % in cycle 0 to 9. 24%; in cycle 8 with average increase of 0. 55% per cycle and therealized heritability was 0. 459 5. ②Along with selection of oil content, protein and lysinecontent in seeds increased significantly; yield, 100-kernel weight, ear weight, kernel weightper ear, plant height and ear diameter reduced significantly; other traits didn't change sig-nificantly. ③Highly significant positive correlations between oil content and protein/lysinecontent were detected; significant negative correlations with ear weight, kerne1 weight perear, eardiameter, 100-kernel weight and yield were also existed. ④The selection method i.e. within-ear selection used in BHO population for oil cantent improvement was reasonableand effective. But the genetic gain would be 10% higher than the level already obtained if acombined selection scheme was applied.
【Fund】: 国家自然科学基金!39170470
【CateGory Index】: S513.33
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