Genetic variability for tolerance of drying injury in seed corn (Zea mays L.)

dc.contributor.author Bdliya, Paul
dc.contributor.department Agronomy
dc.date 2018-08-17T01:58:44.000
dc.date.accessioned 2020-07-02T06:07:24Z
dc.date.available 2020-07-02T06:07:24Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 1987
dc.date.issued 1987
dc.description.abstract <p>Research was conducted to study the influence of parentage and to assess the degree of contribution of the various genetic components in the variation for tolerance of seed to high drying temperature among six maize inbred lines;The inbred lines (A632, A641, B14A, B73, Mol7 and W64A) selected for this study were based on the seeds' previous history of susceptibility to drying injury. Diallel crosses among the six lines were made by hand in 1984 and 1985. Seeds were harvested at two different times; a high moisture harvest (ca. 50%) and a low moisture harvest (ca. 35%). Seeds from each harvest were dried to 12% at either 50 C or 35 C. Hybrid seeds were evaluated in the laboratory for tolerance of drying injury using five seed quality traits--warm (standard) and cold germinations, 100 kernel weight, seedling dry weight and shoot/root ratio;Analyses of inbred means, combined for both years, indicate that larger and significant (P < 0.05) variability exists among lines when used as seed rather than as pollen parents for warm and cold germinations when seeds were dried at 50 C. The influence of inbreds as pollen parents was not significant, as assessed by cold germination, in any of the treatment combinations. For 100 kernel weight, seedling dry weight and shoot/root ratio, variability observed among inbred means used as seed or pollen parents were however significant (P < 0.05). This, perhaps, was due to heterosis;General combining ability (GCA) and maternal gene effect mean squares were significant (P < 0.01) and larger than those of specific combining ability (SCA) and reciprocal components for the five seed quality traits in the four treatment combinations. This indicates that both additive and maternal gene effects were more important than nonadditive, dominant and reciprocal gene effects in the variation for tolerance of drying injury among these six lines. Environment (year), however, had a significant (P < 0.01) effect on the contributions of these genetic components.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/8513/
dc.identifier.articleid 9512
dc.identifier.contextkey 6335268
dc.identifier.doi https://doi.org/10.31274/rtd-180813-8601
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/8513
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/81510
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/8513/r_8716743.pdf|||Sat Jan 15 02:12:55 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.keywords Agronomy
dc.subject.keywords Crop production and physiology
dc.title Genetic variability for tolerance of drying injury in seed corn (Zea mays L.)
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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