AN INVESTIGATION OF GENOTYPE × ENVIRONMENT INTERACTION IN RELATION TO A SELECTION EXPERIMENT IN TRIBOLIUM CASTANEUM

1971 ◽  
Vol 13 (1) ◽  
pp. 144-154 ◽  
Author(s):  
G. W. Friars ◽  
B. N. Nayak ◽  
P. Y. Jui ◽  
B. L. Raktoe
Keyword(s):  
Tribolium Castaneum ◽  
Environment Interaction ◽  
Selection Experiment ◽  
Response To Selection ◽  
Slight Tendency ◽  
Offspring Number ◽  
Genotype Environment Interaction ◽  
Reverse Trend ◽  
Selection For ◽  
Selection Of

An experiment involving the selection of certain lines of Tribolium castaneum for larva weight and others for offspring number in both wet and dry environments was carried out over nine generations. No apparent interactions of environment-selected-in × environment-tested-in was found. That is, the environment-selected-in did not condition response to selection for larva weight, although some slight tendency toward this type of effect was noted for offspring number. However, lines selected for high larva weight showed greater response over controls when tested in the wet as opposed to the dry environment.Crosses of the respective lines indicated that the hatchability of lines selected for larva weight was elevated when they were shifted from the dry to the wet environment. However, the reverse trend was apparent for the control lines. A cross of lines selected for offspring number in wet and dry environments respectively showed repeated superiority in hatchability over other lines and crosses to which it was compared.

scholarly journals Genotype × environment interaction in Tribolium castaneum

1964 ◽  
Vol 5 (3) ◽  
pp. 335-340 ◽  
Author(s):  
J. F. Kidwell ◽  
A. E. Freeman ◽  
L. H. Haverland ◽  
G. M. H. Rolfes
Keyword(s):  
Relative Humidity ◽  
Tribolium Castaneum ◽  
Total Variance ◽  
Direct Selection ◽  
Environment Interaction ◽  
Breeding Values ◽  
Genotype Environment Interaction ◽  
The Mean ◽  
Selection For ◽  
C 30

An experiment was conducted with the flour beetle, Tribolium castaneum to investigate genotype-environment interaction. Ninety-two matings of one male and three females were made at random from a large panmictic population. The females were transferred to individual containers after 4 days. Six daughters were randomly selected from each sire–dam pair and individually mated to unrelated males. Three of the six were placed in an incubator (33·3°C., 45% relative humidity) and three in a cabinet at room conditions (22·2–26·7°C., 30–35% relative humidity) and allowed to produce eggs during a 3-day period. Progeny were counted as pupae and larvae. The traits studied were number of pupae and number of pupae plus number of larvae. A transformation to (X +1)½ was required. A conventional least-squares model was employed, and a large environmental effect was observed. In the incubator the mean number of pupae was 13·4 and of pupae + larvae was 20·1 while the corresponding figures for room conditions were 3·3 and 9·2. Genotype-environment interaction accounted for 3·7 to 6·7% of the total variance for (pupae + 1)½ and 2·1 to 8·3% for (pupae + larvae+ 1)½. Heritability of the traits was essentially the same in both environments. The interaction was due to an increasing difference between environments in production associated with increasing breeding values of the sire, and to small changes in rank of breeding values on the two environments. As a result of the interaction, selection in one environment for production on the other would be expected to be only 71 to 72% as effective as direct selection for (pupae + 1)½ and 62 to 86% for (pupae + larvae + 1)½ even though the fraction of the total variance attributed to genotype-environmental interaction was less than 10%.

scholarly journals MULTIPLICATIVE GENOTYPE-ENVIRONMENT INTERACTION AS A CAUSE OF REVERSED RESPONSE TO DIRECTIONAL SELECTION

Genetics ◽  
1986 ◽  
Vol 114 (1) ◽  
pp. 333-343
Author(s):  
A Gimelfarb
Keyword(s):  
Sudden Change ◽  
Phenotypic Selection ◽  
Directional Selection ◽  
Quantitative Character ◽  
Environment Interaction ◽  
Response To Selection ◽  
Random Drift ◽  
Genotype Environment Interaction ◽  
Possible Cause ◽  
Selection Of

ABSTRACT In experiments with directional selection on a quantitative character a "reversed response" to selection is occasionally observed, when selection of individuals for a higher (lower) value of the character results in a lower (higher) value of the character among their offspring. A sudden change in environments or random drift is often assumed to be responsible for this. It is demonstrated in this paper that these two causes cannot account for the reversed response at least in some of the experiments. Multiplicative genotype-environment interaction is discussed as a possible cause of a reversed response to directional selection. Such interaction entails either disruptive or stabilizing genotypic selection, even when the phenotypic selection is directional.

ADDENDUM AND CORRECTION TO AN INVESTIGATION OF GENOTYPE × ENVIRONMENT INTERACTION IN RELATION TO A SELECTION EXPERIMENT IN TRIBOLIUM CASTANEUM

1974 ◽  
Vol 16 (1) ◽  
pp. 234-236
Author(s):  
S. Malik ◽  
G. W. Friars ◽  
B. L. Raktoe
Keyword(s):  
Canadian Journal ◽  
Tribolium Castaneum ◽  
Environment Interaction ◽  
Selection Experiment ◽  
Missing Value ◽  
Cell Means ◽  
Genotype Environment Interaction

The analysis of the data of experiment 2 in the original paper (Canadian Journal of Genetics and Cytology, XIII, 1971, 144-154) was not exact, in that the indicator covariate was not introduced for each missing value. An analysis based on cell means has not changed any of the biological conclusions in the original paper.

scholarly journals Studies in Artificial Selection of Quantitative Characters II. Selection for Body Weight in Drosophila Melanogaster

1963 ◽  
Vol 16 (2) ◽  
pp. 516 ◽  
Author(s):  
BL Sheldon
Keyword(s):  
Body Weight ◽  
Genetic Variability ◽  
Genetic Parameters ◽  
Random Mating ◽  
Environment Interaction ◽  
Genotype Environment Interaction ◽  
Quantitative Characters ◽  
Diallel Crossing ◽  
Selection For ◽  
Selection Of

The method of diallel crossing within a population with random mating was used to estimate genetic parameters for body weight in an Oregon-RO laboratory stock. This showed an absence of additive genetic variability, a high proportion of non-additive genetic variability, and considerable genotype-environment interaction.

Simultaneous selection for high yield and stability in common bean (Phaseolus vulgaris) genotypes

2002 ◽  
Vol 138 (3) ◽  
pp. 249-253 ◽  
Author(s):  
F. MEKBIB
Keyword(s):  
Common Bean ◽  
Genotype By Environment Interaction ◽  
Yield Stability ◽  
High Yield ◽  
Environment Interaction ◽  
Yield Performance ◽  
Simultaneous Selection ◽  
Selection For ◽  
Stability Statistics ◽  
Selection Of

Phenotypic yield stability is a trait of special interest for plant breeders and farmers. This value can be quantified if genotypes are evaluated in different environments. Common bean is the main cash crop and protein source of farmers in many lowland and mid-altitude areas of Ethiopia. An experiment was undertaken to evaluate common bean genotypes for yield performance at Alemaya, Bako and Nazreth in Ethiopia for 3 years. The yield performance of genotypes was subjected to stability analysis and yield-stability statistics were generated to aid the selection of genotypes that were high yielding and very stable. The significant genotype by environment interaction indicated that the relative performance of the varieties altered in the different environments. Genotype yield performance varied ranging from 1511–2216 kg/ha. Simultaneous selection for yield and yield-stability statistics using YS(i) statistics indicated that A 410, GLP x92, Mx-2500-19, G 2816, A-195, 997-CH-1173, Diacol calima, ICA 15541 and AND 635 were both high yielding and stable. Following this study, using farmers’ evaluation and other criteria, GLP x92 and G-2816 were identified as preferred genotypes and were released for further production.

The impact of racial pattern on the genetic improvement of Morada Nova sheep

2016 ◽  
Vol 58 ◽  
pp. 73-82 ◽  
Author(s):  
L. Shiotsuki ◽  
P.H.T. Silva ◽  
K.M. Silva ◽  
A.V. Landim ◽  
O.R. Morais ◽  
...  
Keyword(s):  
Birth Weight ◽  
Genetic Improvement ◽  
Coat Colour ◽  
Simulated Population ◽  
Response To Selection ◽  
Selection For ◽  
Productive Traits ◽  
Red Variety ◽  
The Impact ◽  
Selection Of

SummaryThe objective of the present study was to describe the frequency of the main racial traits of Morada Nova sheep and simulate the impact of this culling on the response to selection for birth weight. The data from sex, coat colour, hoof pigmentation, muzzle pigmentation, polled and cryptorchidism were collected individually at weaning from 385 Morada Nova sheep of the red variety, born between 2010 and 2012, which belonged to four different flocks in the state of Ceará, Brazil. To estimate the impact of culling of animals due to racial pattern on the genetic improvement of the Morada Nova population, the genetic gains in birth weight per generation were calculated considering the following different scenarios of culling due to racial pattern in a simulated population. The present results indicate that the most urgent step is flexibilization of the requirement of dark muzzles and hooves. The selection of Morada Nova sheep based on racial pattern has caused losses in the genetic gain for productive traits such as birth weight. Readaptation of the official racial pattern established for Morada Nova sheep is necessary so that the racial pattern is achieved and an adequate number of animals will be available for selection.

scholarly journals Challenges and adaptive strategies in pig breeding from the aspect of heat stress and heat tolerance

2020 ◽  
Vol 24 (1) ◽  
pp. 1-13
Author(s):  
István Nagy ◽  
György Kövér ◽  
Zsolt Gerencsér ◽  
Gabriella Szász
Keyword(s):  
Heat Tolerance ◽  
Temperature Effects ◽  
Selection Criteria ◽  
Relevant Literature ◽  
Genetic Selection ◽  
Adaptive Strategies ◽  
Environment Interaction ◽  
Genotype Environment Interaction ◽  
Selection For ◽  
The Ideal

Authors summarized the results of the last three decades’ relevant literature examining the temperature effects on the various growth, reproductive and carcass traits in pigs. The ideal period of temperature measurement and the different methodologies characterizing temperature effects were summarized. The aspects of genotype environment interaction for the measured traits under hot and temperate conditions were also presented. Finally the possibilities of direct genetic selection for heat tolerance and its possible selection criteria traits were also discussed.

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