Exploiting Grain-Filling Rate and Effective Grain-Filling Duration to Improve Grain Yield of Early-Maturing Maize

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dc.contributor.authorGasura, Edmore
dc.contributor.authorSetimela, Peter
dc.contributor.authorEdema, Richard
dc.contributor.authorGibson, Paul T.
dc.contributor.authorOkori, Patrick
dc.contributor.authorTarekegne, Amsal
dc.date.accessioned2022-05-26T16:36:22Z
dc.date.available2022-05-26T16:36:22Z
dc.date.issued2013
dc.description.abstractEarly-maturing maize (Zea mays L.) genotypes yield 15 to 30% less than late-maturing genotypes. One strategy for improving grain yield in the early-maturing group involves assessment of grain-filling traits as secondary traits for selection for high grain yield. In this study, we investigated the possibility of using grainfilling rate and duration for improving grain yield in early-maturing tropical maize. Forty-four hybrids generated using North Carolina design II were evaluated at CIMMYT-Zimbabwe during the 2011/2012 season under irrigated and nonirrigated environments. Although grain-filling rate and effective grain-filling duration were negatively correlated, several hybrids were distinctly above the trend line. The earliest-maturing hybrid took 127 d to reach physiological maturity and produced grain yields comparable to those of the medium-maturing genotypes (7 t ha-1). It had a high grain-filling rate of 2.40 g per plant d-1 (18% higher than those of the lowyielding hybrids) and a relatively longer effective grain-filling duration. Grain-filling rate and effective grain-filling duration had high coefficients of genetic determination, positive correlations with grain yield, low error terms, and low genotype × environment interactions, making them appropriate selection traits for improved grain yield. The study shows that it is possible to develop high-yielding early- to medium-maturing maize hybrids based on favorable combining ability values for grain-filling rate and duration.en_US
dc.identifier.citationGasura, E., Setimela, P., Edema, R., Gibson, P. T., Okori, P., & Tarekegne, A. (2013). Exploiting grain-filling rate and effective grain-filling duration to improve grain yield of early-maturing maize. Crop Science, 53, 2295-2303. doi: 10.2135/cropsci2013.01.0032en_US
dc.identifier.other10.2135/cropsci2013.01.0032
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/3504
dc.language.isoenen_US
dc.publisherCrop Scienceen_US
dc.subjectGrain-Filling Rateen_US
dc.subjectGrain-Filling Durationen_US
dc.subjectGrain Yielden_US
dc.subjectEarly-Maturing Maizeen_US
dc.titleExploiting Grain-Filling Rate and Effective Grain-Filling Duration to Improve Grain Yield of Early-Maturing Maizeen_US
dc.typeArticleen_US
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