GENE EFFECTS IN CORN (<i>ZEA MAYS</i> L.): II. RELATIVE IMPORTANCE OF GENE EFFECTS FOR PLANT HEIGHT AND CERTAIN COMPONENT ATTRIBUTES OF YIELD

Gamble, E. E.

doi:10.4141/cjps62-049

Cited by 35 publications

(25 citation statements)

References 4 publications

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“…Generation means were calculated for each of the 6 generations on an individual plant basis using OPSTAT software .To determine the mode of inheritance of resistance/tolerance to Striga, Gamble's (1962) The model for a generation mean, Y, is:…”

Section: Discussionmentioning

confidence: 99%

Generation Means Analysis for Estimation of Genetic Parameters for Striga hermonthica Resistance in Maize (Zea mays L.)

Mbogo¹,

Dida²,

Owuor³

2015

JAS

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Striga hermonthica is a parasitic weed species that causes considerable yield loss in susceptible maize cultivars in western Kenya. A generation means analysis was conducted to estimate gene effects influencing resistance/tolerance to Striga hermonthica in maize cultivars adapted to western Kenya. A resistant inbred line developed by Maseno University, MSMP1/P2 was crossed to Striga susceptible inbred line 5057. Experimental units comprised of resistant parent P 1 , susceptible parent P 2 , their F 1 and F 2 generations, and BC 1 P 1 and BC 1 P 2 generations. The six generations were evaluated under Striga sick plots at Nyahera during the short rains of 2012 and long rains of 2013. Field evaluation for entries were grown in a randomized complete block design with three replicates. The results showed significant differences among generations for emerged Striga, Striga damage rating and maize growth including Plant and Ear height. Most of the additive, dominance, additive x additive, additive x dominance and dominance x dominance effects were significant indicating the importance of the additive, dominance and epistatic modes of gene actions in controlling emerged Striga, Striga damage rating, plant and ear height. Most components conferring Striga tolerance behaved in a qualitative manner. Dominance effects had higher mean values over additive effects. Significant dominant genetic effects (d) for Striga emergence and Striga damage rating suggested preponderance of non-additive genetic effects in the inheritance of Striga tolerance. The results also reveal the involvement of duplicate epistasis where the dominance estimate and dominance x dominance interaction had opposite signs. The presence of duplicate type of gene interaction confirms the importance of dominance gene effects.

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Section: Discussionmentioning

confidence: 99%

Generation Means Analysis for Estimation of Genetic Parameters for Striga hermonthica Resistance in Maize (Zea mays L.)

Mbogo¹,

Dida²,

Owuor³

2015

JAS

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“…Population means and variances were used to estimate the type of gene action for each in vitro trait. The six population means in each cross were used to estimate six parameters for gene effects, using the relationships given by Gamble (1962); ie, m, a, d, aa, ad and dd which refer to mean effects, additive, dominance, additive x additive, additive x dominance, and dominance x dominance gene effects, respectively. The significance of these effects were tested by the ttest.…”

Section: Methodsmentioning

confidence: 99%

“…The relative importance of additive, dominance and the two-loci epistasis was studied using the model proposed by Gamble (1962). The five genetic effects for the five in vitro traits are given in Table 3.…”

Section: Type Of Gene Action Using Generation Meansmentioning

confidence: 99%

Estimation of genetic parameters for in vitro traits in wheat immature embryo cultures involving high X low regeneration capacity genotypes

Barakat

1996

Euphytica

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Estimates of gene actions were obtained for five in vitro traits of immature wheat (Triticum aestivum L.) embryo cultures from a cross of two wheat cultivars and the resulting reciprocal, Fl, F2 and backcross populations. The contribution of additive gene effects to in vitro traits was not as important as the dominance gene effects. Epistatic gene effects were relatively more important than either additive or dominance gene effects. Of the individual types of digenic epistatic effects, the dominance x dominance estimates were relatively larger in magnitude for all in vitro culture traits measured. The maternal effect played a minor role in the inheritance of the in vitro studied traits since the difference among the reciprocal values was not significant. It is shown from the generation mean method that epistasis played a major role in the inheritance of most of the traits under study, The negative values of additive and dominance genetic variance were estimates of zero. Heritability estimates, in broad sense, were relatively high for the in vitro studied traits. In some cases, heritability estimates in broad and narrow senses are almost equal since the estimation of dominance genetic variance led to negative values. According to the results of the gene effects, dominance and epistasis were important for the shoot formation trait. Selection would be effective among the isolated genotypes on individual basis.

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“…Using his 1957 thesis data Gamble (1962aGamble ( , 1962b) reevaluated for epis tasis by Hayman's (1958) method. The particular maize inbreds, generations.…”

Section: Applications Of the Methods Of Determining Gene Actionmentioning

confidence: 99%

Genetic parameters estimated from generation means in four diallel sets of maize inbreds

Darrah

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GENE EFFECTS IN CORN (ZEA MAYS L.): II. RELATIVE IMPORTANCE OF GENE EFFECTS FOR PLANT HEIGHT AND CERTAIN COMPONENT ATTRIBUTES OF YIELD

Abstract: ABSTRACT

Cited by 35 publications

References 4 publications

Generation Means Analysis for Estimation of Genetic Parameters for Striga hermonthica Resistance in Maize (Zea mays L.)

Generation Means Analysis for Estimation of Genetic Parameters for Striga hermonthica Resistance in Maize (Zea mays L.)

Estimation of genetic parameters for in vitro traits in wheat immature embryo cultures involving high X low regeneration capacity genotypes

Genetic parameters estimated from generation means in four diallel sets of maize inbreds

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