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        <dc:title>Exploiting Grain-Filling Rate and Effective Grain-Filling Duration to Improve Grain Yield of Early-Maturing Maize</dc:title>
        <dc:creator>Gasura, E</dc:creator>
        <dc:creator>Setimela, P</dc:creator>
        <dc:creator>Edema, R</dc:creator>
        <dc:creator>Gibson, P T</dc:creator>
        <dc:creator>Okori, P</dc:creator>
        <dc:creator>Tarekegne, A</dc:creator>
        <dc:subject>Maize</dc:subject>
        <dc:description>Early-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 grain-filling 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 low-yielding 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.</dc:description>
        <dc:publisher>Crop Science Society of America</dc:publisher>
        <dc:date>2013</dc:date>
        <dc:type>Article</dc:type>
        <dc:type>PeerReviewed</dc:type>
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        <dc:language>en</dc:language>
        <dc:identifier>http://oar.icrisat.org/7421/1/cs-53-6-2295%281%29.pdf</dc:identifier>
        <dc:identifier>  Gasura, E and Setimela, P and Edema, R and Gibson, P T and Okori, P and Tarekegne, A  (2013) Exploiting Grain-Filling Rate and Effective Grain-Filling Duration to Improve Grain Yield of Early-Maturing Maize.  Crop Science, 53.  pp. 2295-2303.  ISSN 0011-183X     </dc:identifier>
        <dc:relation>http://dx.doi.org/10.2135/cropsci2013.01.0032</dc:relation></oai_dc:dc>
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