Research@Lincoln
    • Login
     
    View Item 
    •   Research@Lincoln Home
    • Theses and Dissertations
    • Theses and Dissertations with Restricted Access
    • View Item
    •   Research@Lincoln Home
    • Theses and Dissertations
    • Theses and Dissertations with Restricted Access
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Inheritance studies in four New Zealand wheat cultivars

    Mohd, Noor Abdul Ghani
    Abstract
    Inheritance and correlations of yield, yield components, and morpho-physiological and agronomic characters involving four parent diallel crosses of F₁ and F₂ generation were studied in Kopara, Ruru, Hilgendorf and Oroua. Three environments in terms of different sowing dates were imposed in the Fl generation in order to study the stability of the genetic system. Dominance variation was important in governing the inheritance of yield, and significance of specific combining ability from a combining ability analysis was established. Additive genetic variation was significant for two yield components, that is, number of spikelets on the main stem and number of grains per ear, and all morpho-physiological and agronomic characters, except maximum tiller production, tiller survival, and tiller mortality. Dominance variation was significant for 1000 grain weight. Epistasis was present for number of ears per plant and yield in the F₁ and F₂ generations respectively. (Wr, Vr) graphical analysis indicated the presence of over-dominance for yield, 1000 grain weight, ear area, and maximum tiller production in F₁ generation, and number of ears per plant and tiller survival in F₂ generation. Partial dominance was present for other characters in both generations. Narrow sense heritability was high for number of spikelets on the main stem, number of grains per ear, and all morpho-physiological and agronomic characters, except maximum tiller production, tiller survival, and tiller mortality. Positive genotypic correlations between yield and number of spikelets on the main stem, number of grains per ear, 1000 grain weight, and all morpho-physiological and agronomic characters, except tiller characters, were indicated. Combining ability analysis suggested that Ruru and Kopara gave consistently high general combining ability effects for yield, number of spikelets on the main stem, number of grains per ear, and all morpho-physiological and agronomic characters, except tiller characters. Based on spaced planting of F₁ and F₂ generations, bulk population breeding for yield would be a more efficient method to use in early generations and the pedigree method may be best applied in later generations. In early generations, selection for number of spikelets on the main stem, number of grains per ear, and all morpho-physiological and agronomic characters, except tiller characters, should give good response. Analysis of genetic-environmental interactions indicated instability of additive effects for number of spikelets on the main stem, flag leaf area, ear area, anthesis date, plant height, spikelets 12 fertility, and flag leaf angle under different environments. Dominance effect was quite stable for all characters. Epistasis which controlled the inheritance of number of ears per plant and flag leaf angle was also quite stable.... [Show full abstract]
    Keywords
    wheat; cultivars; yield components; inheritance; wheat crosses; epistasis; genetic variation; genetic-environmental interactions
    Date
    1980
    Type
    Thesis
    Access Rights
    Digital thesis can be viewed by current staff and students of Lincoln University only. If you are the author of this item, please contact us if you wish to discuss making the full text publicly available.
    Collections
    • Theses and Dissertations with Restricted Access [2368]
    • Department of Agricultural Sciences [1572]
    View/Open
    Staff/student login to read
    Share this

    on Twitter on Facebook on LinkedIn on Reddit on Tumblr by Email

    Metadata
     Expand record
    This service is maintained by Learning, Teaching and Library
    • Archive Policy
    • Copyright and Reuse
    • Deposit Guidelines and FAQ
    • Contact Us
     

     

    Browse

    All of Research@LincolnCommunities & CollectionsTitlesAuthorsKeywordsBy Issue DateThis CollectionTitlesAuthorsKeywordsBy Issue Date

    My Account

    LoginRegister

    Statistics

    View Usage Statistics
    This service is maintained by Learning, Teaching and Library
    • Archive Policy
    • Copyright and Reuse
    • Deposit Guidelines and FAQ
    • Contact Us