Comparison of S3 Progeny and Testcross Performance in Suwan 3 Maize Variety
The objective of this study was to compare S3 progeny (S3) and S3 testcross (TC) methods for population improvement and inbred and hybrid development. Two subpopulations of Suwan 3 (S) C4 (F) (A) and Suwan 3 (S) C4 (SF) (B) and two inbred testers (Ki 45 for A and Ki 47 for B) were used. Hundred progenies from each method in both subpopulations were evaluated in the 2000 late rainy season at Suwan Farm. Ten highest-yielding entries selected from each method in both subpopulations were grouped using their S4 seeds to form 4 synthetics. Fourteen topcrosses of the 4 synthetics and 3 original populations crossed with the 2 testers, 21 population crosses of the 7 populations, and the 7 populations per se were evaluated in the 2002 early rainy season. Ten S6 lines from the highest- yielding selection of each method of AC0 and BC0 crossed with the 2 testers were evaluated. Ten S7 lines from the 2 methods of both subpopulations were also evaluated. Genetic variability among progenies evaluated over both subpopulations showed that the S 3 method was 4.3 times greater than the TC method for all of 14 agronomic characters measured, and 2.4 times for grain yield. Correlation coefficient between the two methods for grain yield was 0.248. The S3 method was more efficient in evaluating S 3 lines than the TC for improving yields of populations per se and topcrosses. The TC method was more efficient in improving yields of population crosses. Both methods were not different in selecting high-yielding inbreds and hybrids.
S3 progeny Testcross Maize Improvement Inbred Hybrid
Chokechai Aekatasanawan Saowanee Dachakumpoo Amnuay Yothasiri Pradit Pongtongkam
National Corn and Sorghum Research Center, Inseechandrastitya Institute for Crops Research and Devel Siam Food Products Public Co., Ltd., 3195/14 Rama IV Road, Vibulthani Tower 1, 9th FI. Klong Toey, B Department of Agronomy, Faculty of Agriculture, Kasetsart University, Chatuchak, Bangkok 10900, Thai Department of Genetics, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
36-39
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）