Single cross corn hybrids developed from indigenous and exotic inbred lines
1996
Suphot Iamsangsri
Exotic corn inbred lines from International Maize and Wheat Improvement Center (CIMMYT) and International Institute for Tropical Agriculture (IITA) were crossed with Ki 21 (tester) of the Corn Breeding Project, KU. Evaluation of single cross hybrids was carried out in 1992 late rainy season with Suwan 3101 as a check. It was found that the cross between Tzi 15 (W)-6 x Ki 21 gave the highest yield 6,962 kilogram per hectare which was higher than check 29 percent. Selection was done and 12 advanced exotic inbred lines were crossed with 6 indigenous inbred lines to produce single crosses. Evaluation of 72 single crosses was conducted in 1993 late rainy season and found that Tzi 15(W)-6 x Ki 37 produced the highest yield 6,225 kilogram per hectare. Evaluation in 1994 dry season found that IITA 6(Y)-3 x Ki 37 gave the highest yield 10,112 kilogram per hectare with 17 and 6 percent higher than Suwan 3101, respectively. And yield average from 2 seasons (1993 late rainy season and 1994 dry season) found that CML 56 x Ki 37 gave the highest yield 7,919 kilogram per hectare with 6 percent higher than Suwan 3101. For the combining ability, the indigenous inbred lines that showed good general combining ability were Ki 37 and Ki 35 whereas the exotic inbred lines that expressed good general combining ability were Pool 32 C19MH233-2-1--xb--, Across 7632-12-3-xb-- and Tzi 15(W)-6. These inbred lines seem to have potential in development of new hybrids.
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