Comparison of S2 progeny and testcross performance in Suwan 5 maize variety: I. Line evaluation | เธเธฒเธฃเนเธเธฃเธตเธขเธเนเธเธตเธขเธเธงเธดเธเธตเธเธฒเธฃเธเธฑเธเนเธฅเธทเธญเธเธชเธฒเธขเธเธฑเธเธเธธเนเธเธชเธกเธเธฑเธงเนเธญเธเธชเธญเธเธเธฑเนเธงเธเธฑเธเธงเธดเธเธตเธชเธฒเธขเธเธฑเธเธเธธเนเธเธชเธกเธเธฑเธเธเธฑเธงเธเธเธชเธญเธเนเธเธเนเธฒเธงเนเธเธเธเธฑเธเธเธธเนเธชเธธเธงเธฃเธฃเธ 5 : 1. เธเธฒเธฃเธเธฃเธฐเนเธกเธดเธเธชเธฒเธขเธเธฑเธเธเธธเน
2007
Chokechai Aekatasanawan(Kasetsart University, Bangkok (Thailand). Inseechandrasatitya Institute for Crop Research. National Corn and Sorghum Research Center) E-mail:ijscca@ku.ac.th | Noppong Chulchoho(Kasetsart University, Bangkok (Thailand). Inseechandrasatitya Institute for Crop Research. National Corn and Sorghum Research Center) | Amnuay Yothasiri(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Agronomy) | Sombun Techapinyawat(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Science. Department of Genetics)
Objective of this research was to compare the two evaluation methods of S2 line per se (S2) and S2 testcross (TC) for line evaluation in two subpopulations of Suwan 5(S)C3 (AB), Suwan 5(S)C3(F) (A) and Suwan 5(S)C3(SF) (B). The inbred testers of the TC method were Ki 45 in A and Ki 46 in B subpopulations, respectively. A hundred progenies from each method in both subpopulations (A-S2 x Ki 45 เนเธฅเธฐ B-S2 x Ki 46) were evaluated in the 2000 early rainy season at the National Corn and Sorghum Research Center, Nakhon Ratchasima. The results of genetic variability among progenies evaluated over both subpopulations showed that the S2 method (22.38 percent) was 1.84 times greater than the TC method (12.15 percent) for all of 15 agronomic characters measured, and 4.35 times for grain yield. Correlation coefficient (r) between the two methods for grain yield was 0.069. Total number of common S2 lines of the two methods for the 10-highest and 10 lowest-yielding groups in both subpopulations were the two lines.
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