Diallel cross among eight Thai supersweet composite 1 DMR inbreds
1997
Chokechai Aekatasanawan | Sansern Jampatong | Chamaiporn Aekatasanawan | Noppong Chulchoho (Kasetsart Univ., Bangkok (Thailand). National Corn and Sorghum Research Center)
Objective of this research was to investigate good shrunken-2 (sh2) sweet corn inbreds for pruducing high-yielding hybrids with high eating quality for the fresh market and processing. A diallel cross among eight Thai Supersweet Composite 1 DMR (TSC 1 DMR) inbreds controlled by sh2 gene was done. Combining ability of these inbreds was analyzed by using Griffing's (1956) Method 4, Model I. The resulting 28 crosses and two check varieties (TSC 1 DMR and HSX 27127) were evaluated in the 1992 early and late rainy seasons at the National Corn and Sorghum Research Center, Nakhonratchasima. The results indicated that TSC 1 DMR-S9-8-2-1-1 had significant positive general combining ability effects for husked ear weight (146.1 kg/rai), ear length (0.642 cm), soluble solids content (0.638 percent brix), and tenderness (rating -0.179). The single cross of this inbred crossed with SSWI 114 showed a significant positive specific combining ability effect (P0.05) for husked ear weight (83.2 kg/rai). This hybrid gave significantly higher means of husked ear weight (1,392 kg/rai), ear length (15.8 cm), and tenderness (rating 1.1) than those of HSX 27127, a check. Furthermore, it gave higher soluble solids content (15.1 percent brix) and the same ear diameter (3.9 cm) as the check. It also had some agronomic traits better than the check, i.e., earlier anthesis and silking dates (51 and 52 days, respectively) and synchronization.
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