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- W639959904 abstract "Local composite varieties of sweet com (lea mays L. saccharata) offer moderateyields and eating quality, while imported hybrid varieties are less adaptable to thelocal environment, although having good eating quality. A breeding programme wastherefore initiated at Universiti Putra Malaysia (UPM). utilising both geneticmaterials to produce new superior genotypes. The main objectives of this study wereto investigate the genetics of populations, and to evaluate genetic response in twosweet com populations generated from two cycles of phenotypic mass selection.In Experiment 1, a local cotnposite variety, Manis Madu and two imported hybridvarieties, Hybrid SSC 240 and Hybrid 368 were first evaluated, and found to showcomparable performance. Consequently, Manis Madu and Hybrid SSC 240 werechosen as source populations for selection and were then crossed to generate the basepopulation. In Experiment 2, the performance of the cross population was comparedto its parents, and was found to show more resemblance to Hybrid SSC 240. Separately and simultaneously, two cycles of phenotypic mass selection for earlength were employed on the two base populations, Manis Madu, designated asM CO, and the intennated crossed population, designated as MS CO, at Field 2, UPM.The two base populations and the populations generated from the two cycles ofselection were then evaluated and compared for general performance at twolocations, Field 2 and Share Farm, in UPM.In Manis Madu populations (M), the predicted responses to individual cycles ofselection were almost the same for both cycles, 19.3% in the first cycle and 19.6% inthe second. The cumulative predicted response in M C2 population was 43.6%. Inthe cross populations (MS), the predicted response to individual cycles of selectionwas higher in the second cycle (26.5%) than it was in the first (16.8%). Thecumulative pred icted response in MS C2 population was 46.4%.The two populations responded differently to the two cycles of selection, where, inManis Madu populations, a positive realised response was only attained in first cycle(4.1%), while a negative one was observed in the second (-0.7%). In contrast, thecross populations showed negative realised response in the first cycle (-0.7%), whilea reasonable positive one (2.08%) was observed in the second. The averagecumulative realised response to selection was higher in M C2 (3.4%) than that in MSC2 0.4%). As expected, the realized responses were lower than the predicted." @default.
- W639959904 created "2016-06-24" @default.
- W639959904 creator A5086247592 @default.
- W639959904 date "2003-05-01" @default.
- W639959904 modified "2023-09-27" @default.
- W639959904 title "Genetics and Genetic Response in Populations Generated from Two Cycles of Phenotypic Mass Selection in Sweet Corn (Zea Mays L. Saccharata)" @default.
- W639959904 hasPublicationYear "2003" @default.
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