Comparison of S2 progeny and testcross performance in Suwan 5 maize variety: II. Population improvement | เธเธฒเธฃเนเธเธฃเธตเธขเธเนเธเธตเธขเธเธงเธดเธเธตเธเธฒเธฃเธเธฑเธเนเธฅเธทเธญเธเธชเธฒเธขเธเธฑเธเธเธธเนเธเธชเธกเธเธฑเธงเนเธญเธเธชเธญเธเธเธฑเนเธงเธเธฑเธเธงเธดเธเธตเธชเธฒเธขเธเธฑเธเธเธธเนเธเธชเธกเธเธฑเธเธเธฑเธงเธเธเธชเธญเธเนเธเธเนเธฒเธงเนเธเธเธเธฑเธเธเธธเนเธชเธธเธงเธฃเธฃเธ 5 : 2. เธเธฒเธฃเธเธฃเธฑเธเธเธฃเธธเธเธเธฃเธฐเธเธฒเธเธฃ
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 population improvement in two subpopulations of Suwan 5(S)C3 (ABC0), Suwan 5(S)C3(F) (AC0) and Suwan 5(S)C3(SF) (BC0). The inbred testers of the TC method were Ki 45 in AC0 and Ki 46 in BC0 subpopulations, respectively. Ten entries selected from each of the highest yield of each method in the two subpopulations were pollinated by using their S2 seeds to form 4 synthetics (A(S2)C1, A(TC)C1, B(S2)C1 and B(TC)C1). The 4 synthetics and 3 original 2 populations were testcrossed with Ki 45 and Ki 46, 21 population crosses of the 7 populations, and the 7 populations per se were evaluated in the 2001 late rainy season at the National Corn and Sorghum Research Center, Nakhon Ratchasima. In conclusion, the S2 method was more efficient in improving yields of populations per se and populations topcrossed with unrelated inbreds. However, the TC method was more efficient in improving yields of related population crosses.
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