dominance interaction
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2014 ◽  
Vol 3 (2) ◽  
pp. 175-191 ◽  
Author(s):  
Hiren B Soni ◽  
Sheju Thomas

The present research was undertaken at three sampling stations of Gomti catchment, Central Gujarat, India, to study dominance, interaction, and interdependence among biotic components (phytoplankton, zooplankton and aquatic macrophytes). The phytoplankton population was represented by 39 genera and 48 species belongs to family Bacillariophyceae (21 species), followed by Cyanophyceae (7), Cholorophyceae (18), and Euglenophyceae (2). In total, seven classes of zooplankton were represented by 36 genera and 39 species. Zooplankton dominance was reflected by class Ciliophora (16 species), followed by Zooflagellata, Rhizopoda and Rotifera (6 each), and Cladocera (3),and least by Copepoda and Ostracoda (1 species each). Of 16 species of aquatic macrophytes, 3 (18.75%) were abundant, 4 (25%) common, and 9 (56.25%) were rare. The indices (Palmer, Nygaard’s, and Macrophyte index) were determined to delineate the interdependent relationship among studied biotic components. Strong association was observed between Chlorophyceae and Bacillariophyceae, Ostracods and Ciliophorans, and Cladocerans and Bacillariophyceans. The detailed results of indices and interdependent associations among biotic components are discussed. The information provided herewith makes an insight for better understanding of the environmental aspects to be addressed effectively for the better protection, conservation, and management of Gomti reservoir, Gujarat, India. DOI: http://dx.doi.org/10.3126/ije.v3i2.10528 International Journal of the Environment Vol.3(2) 2014: 175-191


Genome ◽  
1995 ◽  
Vol 38 (2) ◽  
pp. 277-282 ◽  
Author(s):  
M. K. Das ◽  
C. A. Griffey

Gene action for adult-plant resistance to powdery mildew was studied using generation mean analyses of parents and of F1, F2, and backcross populations derived from a diallel cross of one susceptible and three adult-plant resistant wheat cultivars. Joint scaling tests showed that an additive–dominance model was sufficient to explain the variability in the expression of adult-plant resistance in one cross, while digenic epistasis was involved in the other five crosses. Additive gene effects were predominant; however, dominance was significant in four crosses, additive × additive interaction was significant in three crosses, additive × dominance interaction was significant in three crosses, and dominance × dominance interaction was significant in one cross. Therefore, selection for adult-plant resistance would likely be most effective in advanced generations derived from crosses among the adult-plant resistant cultivars Redcoat, Houser, and Massey.Key words: gene action, adult-plant resistance, Blumeria, Erysiphe graminis f.sp. tritici, Triticum aestivum.


1977 ◽  
Vol 57 (4) ◽  
pp. 1185-1191 ◽  
Author(s):  
M. J. SOKOL ◽  
R. J. BAKER

Simulation of two-locus genetic models was used to investigate the effects of gene frequency, non-random association of genes, and epistasis on the interpretation of diallel experiments in self-pollinating crops. It was demonstrated that general combining ability includes effects due to additive, epistatic, and, when gene frequencies are not equal to 0.5, dominance gene action. Similarly, when gene frequencies do not equal 0.5, average heterosis depends upon additive × dominance interaction as well as dominance and dominance × dominance interaction. Negative associations between genes greatly inflate the apparent amount of specific combining ability. These findings cast serious doubt on the utility of diallel analysis for studying the genetics of self-pollinating crops.


Heredity ◽  
1958 ◽  
Vol 12 (1) ◽  
pp. 73-75 ◽  
Author(s):  
I R Goodwins

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