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Quality assesment and characterization of hybrid wheat in South Africa

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dc.contributor Labuschagne, M. T.
dc.creator Van Eeden, Elaine
dc.date 2018-07-20T09:53:40Z
dc.date 2018-07-20T09:53:40Z
dc.date 2009
dc.date.accessioned 2018-08-07T10:58:53Z
dc.date.available 2018-08-07T10:58:53Z
dc.identifier http://hdl.handle.net/11660/8854
dc.identifier.uri http://hdl.handle.net/11660/8854
dc.description English: The objectives of this study were to determine the quality characteristics of hybrid wheat in South Africa, the influence of the male and female parents on quality and to assess heterosis in hybrid wheat quality. The stability performance of the hybrids, their parental lines and conventional cultivars were also determined. A further objective was to assess sprouting tolerance in hybrid wheat. Twelve hard red genotypes were planted at six locations throughout the Free State in separate winter and facultative trials, during 2004 and 2005. A separate sprouting and falling number trial consisting of 25 genotypes was planted at Bethlehem during 2004 and 2005 to evaluate the sprouting and falling number problem in hybrid wheat and included males, females, hybrids and conventional cultivars. Heads were cut at physiological maturity and thereafter with seven day intervals, for evaluation in a rain simulation facility. Mean squares were highly significant for genotype, environment and year for test weight, SKCS kernel size, Hagberg falling number, ash, alveograph strength and mixograph mixing time in both trials. Highly significant differences were seen for hardness index, break flour yield, flour yield, consistograph water absorption in the IHBPT trial and wet gluten content in the WHBPT trial. The males mainly contributed to poor quality, with the females and conventional cultivars having acceptable quality. The hybrids made up from high quality parents, had better quality in general. Positive heterosis was expressed for test weight, SKCS kernel size and mixing time and negative heterosis for falling number, ash and alveograph strength for both the intermediate and winter trials. Negative heterosis was revealed for hardness index, flour yield and consistograph water absorption in the Intermediate trial and wet gluten content in the winter trial. AMMI stability values confirmed that hybrids had the best stability performance, even more stable than Elands. The males and females performed intermediate with the male genepool being more stable than the female one. The sprouting trial revealed that the male genepool mainly contributed to the poor sprouting tolerance of the hybrids. Combining males and females with good sprouting tolerance provided tolerant hybrids. This was also true for falling number. The method of evaluating sprouting was also revised and should be applied to ensure true tolerant types are selected and to exclude environmental affects.
dc.description Afrikaans: Die doel van hierdie studie was on Suid Afrikaanse winter en fakultatiewe basterkoring te bestudeer ten opsigte van hul bak-en maalkwaliteit en stabiliteit in vergelyking met hul ouers en ander konvensionele cultivars. ‘n Aparte uitloopproef is ontleed om die oorsprong van basters se uitloopprobleme te bepaal. Twaalf harde, rooi genotipes per winter en fakultatiewe proef is gedurende 2004 en 2005 op ses lokaliteite in die Vrystaat geplant. ‘n Aparte uitloop en valgetal proef bestaande uit 25 genotipes inluitende basters, wyfies, mannetjies en konvensionele cultivars is op Bethlehem geplant gedurende 2004 en 2005 om die oorsprong van die uitloop en valgetal probleem in die baster koring vas te stel. Die ryp are is op fisiologies ryp geoes met 7 dae intervalle daarna, en in die reensimuleerder geëvalueer. Die gemiddelde kwadrate was betekenisvol vir genotipes, omgewings en jaar vir hektolitermassa, korrelgewig en–grootte, Hagberg valgetal, as, alveo sterkte en mengtyd in beide proewe. Hoogs betekenisvolle verskille is gekry vir hardheid, breekmeel, meelopbrengs en waterabsorpsie in die fakultatiewe proef en vir nat gluten in die winterproef. Die mannetjies het hoofsaaklik swakker kwaliteit gehad met die wyfies en konvensionele cultivars wat beter kwaliteit getoon het. Positiewe heterose is gevind vir hektolitermassa, korrelgrootte en gewig en mengtyd asook negatiewe heterose vir valgetal, as en alveo sterkte in beide proewe. Negatiewe heterose is gesien vir hardheid, meelopbrengs en waterabsorpsie in die intermediere proef en vir nat gluten in die winterproef. Die AMMI analise het bevestig dat basters die beste stabiliteit getoon het, selfs meer as Elands. Die mannetjies en wyfies het intermediêre stabiliteit getoon en mannetjies was meer stabiel as die wyfies. Die mannetjie genepoel het hoofsaaklik bygedra tot swakker uitloop weerstand. Deur tolerante mannetjies en wyfies te kombineer kan basters met beter toleransie teen uitloop verkry word. Dieselfde is gevind ten opsigte van die valgetal. Die metode om die uitloop te evalueer is ook verfyn om te verseker dat werlik tolerante tipes geselekteer word en om die effekte van jaar uit te skakel.
dc.description National Research Foundation (NRF)
dc.description Monsanto/Sensako
dc.language en
dc.publisher University of the Free State
dc.rights University of the Free State
dc.subject Wheat
dc.subject Wheat -- Quality
dc.subject Wheat -- Breeding
dc.subject Wheat -- Genetics
dc.subject Wheat -- Preharvest sprouting
dc.subject Dissertation (M.Sc.Agric. (Plant Sciences (Plant Breeding))--University of the Free State, 2009
dc.title Quality assesment and characterization of hybrid wheat in South Africa
dc.type Dissertation


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