eprintid: 7421
rev_number: 11
eprint_status: archive
userid: 128
dir: disk0/00/00/74/21
datestamp: 2014-01-28 09:24:54
lastmod: 2018-04-26 09:11:07
status_changed: 2014-01-28 09:24:54
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
creators_name: Gasura, E
creators_name: Setimela, P
creators_name: Edema, R
creators_name: Gibson, P T
creators_name: Okori, P
creators_name: Tarekegne, A
icrisatcreators_name: Okori, P
affiliation: University of Zimbabwe(Harare)
affiliation: CIMMYT(Harare)
affiliation: Makerere University(Kampala)
country: Zimbabwe
country: Uganda
title: Exploiting Grain-Filling Rate and Effective Grain-Filling Duration to Improve Grain Yield of Early-Maturing Maize
ispublished: pub
subjects: s2.6
full_text_status: restricted
note: NOTE: Currently Okori, Patrick is scientist at ICRISAT(Malawi)
abstract: 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.
date: 2013
date_type: published
publication: Crop Science
volume: 53
publisher: Crop Science Society of America
pagerange: 2295-2303
refereed: TRUE
issn: 0011-183X
official_url: http://dx.doi.org/10.2135/cropsci2013.01.0032
related_url_url: http://scholar.google.co.in/scholar?as_q=%22Exploiting+Grain-Filling+Rate+and+Effective+Grain-Filling+Duration+to+Improve+Grain+Yield+of+Early-Maturing+Maize%22&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&as_yhi=&btnG=&hl=en&a
related_url_type: pub
funders: Regional Universities Forum for Capacity Building in Agriculture (RUFORUM), (CIMMYT)
funders: International Foundation for Science (IFS)
citation:   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     
document_url: http://oar.icrisat.org/7421/1/cs-53-6-2295%281%29.pdf