A diallel study of flowering and of ear components of yield in Corn Belt maize and their interactions with population density

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dc.contributor.authorMcClane, John Michaelen
dc.contributor.committeecochairAycock, Harold S.en
dc.contributor.committeecochairStarling, Thomas M.en
dc.contributor.committeememberRoane, Curtis W.en
dc.contributor.committeememberEsen, Asimen
dc.contributor.committeememberStromberg, Eriken
dc.contributor.departmentAgronomyen
dc.date.accessioned2015-06-29T22:07:03Zen
dc.date.available2015-06-29T22:07:03Zen
dc.date.issued1985en
dc.description.abstractA diallel study of American Corn Belt maize (Zea mays L.) was conducted at Holland, Virginia in 1981 and 1982. All possible crosses of twelve inbred parents (A619, A632, B73, H60, H93, H96, Mo17, Oh7B, Pa91, Val7, Va.79:419, Va85) were planted in three replications with population density treatments of 39,536, 49,420, 59,304, and 69,188 pl/ha in strips across hybrid treatments. Analyses of variance and combining ability analyses were performed on traits measuring the timing of anthesis (pollen shed) and silk emergence, on ear components of yield, and on components of kernel size. Density effects were highly significant for all traits, except for that of pollen shed duration, in the analyses combined over years. Hybrid-by-year interactions were highly significant for all traits. Correlations between GCA effects of grain yield and GCA effects of silking delay (anthesis-to-silking interval), kernels per row on the ear, ear kernel number, and kernel depth[(ear diameter - cob diameter)/2] were -0.79, 0.64, 0.66, and 0.80 in 1981, and 0.24, 0.81, 0.71, and 0.26 in 1982, respectively. Moisture stress sufficient to cause wilting occurred before and during silking in 1981. Apparently, short silking delay was associated with high moisture stress tolerance for grain yield in 1981 and was associated with long ear shoot length in 1982. Deep kernel depth apparently was associated with drought stress tolerance for yield as well. The heritabilities of ear traits were higher the earlier they became established in the sequence of development. Heritabilities of silking delay and most ear components of yield were increased by increasing planting density. However, the correlations among flowering and ear traits largely were unaffected by density, perhaps because densities were not high enough to make barrenness a substantial factor in grain yield. The most important traits related to yield were silking delay, kernels per row, kernel depth, and kernel row number. GCA to SCA variance component ratios were increased by combining data over years and by the more optimum season for yield.en
dc.description.degreePh. D.en
dc.format.extentvi, 172 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/53890en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 13535245en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1985.M324en
dc.subject.lcshCorn -- Field experiments. -- Virginiaen
dc.subject.lcshHybrid corn -- Field experiments. -- Virginiaen
dc.subject.lcshCorn -- Spacing -- Virginiaen
dc.subject.lcshCorn -- Genetics. -- Virginiaen
dc.titleA diallel study of flowering and of ear components of yield in Corn Belt maize and their interactions with population densityen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineAgronomyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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