Genetic Variability and Heritability Estimates Based on the F2 Generation from Crosses of Large-Seeded Virginia-Type Peanuts with Lines Resistant to Cylindrocladium Black Rot1

1983 ◽  
Vol 10 (1) ◽  
pp. 47-51 ◽  
Author(s):  
C. C. Green ◽  
J. C. Wynne ◽  
M. K. Beute
Keyword(s):  
Genetic Effects ◽  
Fruit Traits ◽  
Resistant Lines ◽  
The Common ◽  
Low Levels ◽  
Selection For ◽  
Heritability Estimates ◽  
F2 Generation ◽  
Additive Genetic Effects ◽  
Selection Of

Abstract Selection of large-fruited, high-yielding Cylindrocladium black rot — (CBR) resistant lines from two sets of crosses, each set consisting of crosses in F2 generation between a virginia and two CBR-resistant lines, was evaluated to determine the potential for selecting cultivars with these traits. Heritabilities, phenotypic and genotypic correlations and estimates of additive and nonadditive genetic effects were determined for yield and fruit traits at two locations and CBR resistance at one location. Crosses with NC 2 as a parent had higher levels of CBR resistance than those with Florigiant as the common virginia-type parent. Heritability estimates for the necrosis index (CBR resistance) were high while estimates for yield and fruit traits were variable over crosses and locations. The necrosis index was significantly and negatively correlated with all fruit and yield traits for three of the four crosses indicating it should be possible to select high-yielding, largefruited lines with low levels of disease from three crosses. Only significant additive genetic effects were found for CBR resistance. Significant additive and nonadditive genetic effects were found for the yield and fruit traits. Estimates of additive and non-additive genetic effects indicate that early generation selection for CBR resistance should be effective, whereas selection for yield and fruit traits would be more effective in later generations.

Relationship between litter size and perinatal and pre-weaning survival in pigs

2002 ◽  
Vol 74 (2) ◽  
pp. 217-222 ◽  
Author(s):  
M. S. Lund ◽  
M. Puonti ◽  
L. Rydhmer ◽  
J. Jensen
Keyword(s):  
Litter Size ◽  
Negative Correlation ◽  
Genetic Effects ◽  
Direct Effects ◽  
Selection For ◽  
Heritability Estimates ◽  
The Relationship ◽  
Piglet Survival

AbstractThe objective of this study was to analyse the relationship between direct and maternal genetic effects on litter size and piglet survival. The analyses were performed on records from 26 564 Landrace litters and 15 103 Yorkshire litters from first parity dams in Finnish herds. The trivariate model fitted total number of piglets born, proportion alive at birth and proportion survived from birth until 3 weeks as traits of the litter. The model included direct genetic and maternal genetic effects for all traits. In Landrace pigs, maternal heritabilities were estimated to be 0·11 for total number born, 0·06 for proportion alive at birth, and 0·08 for proportion survived from birth until 3 weeks. The corresponding estimates for the Yorkshire breed were 0·14, 0·06 and 0·01. All heritability estimates of direct effects were below 0·05. In the Landrace breed, there was a negative correlation of -0·39 between maternal genetic effects on total number born and maternal genetic effects on proportion survived from birth until 3 weeks and a negative correlation of -0·41 between direct and maternal genetic effects on proportion survived from birth until 3 weeks. These correlations were not significant in the Yorkshire breed. The results show that selection for number born in total alone will lead to a deterioration in the maternal ability of sows. Selection for pre-weaning survival could be achieved by selecting on direct and maternal components jointly.

Estimates of genetic parameters for growth and skeletal measurements in Thai swamp buffalo

2000 ◽  
Vol 70 (3) ◽  
pp. 399-406
Author(s):  
K. Meyer ◽  
H. -U. Graser ◽  
A. Na-Chiangmai
Keyword(s):  
Total Variation ◽  
Genetic Association ◽  
Maternal Effects ◽  
Genetic Parameters ◽  
Genetic Effects ◽  
Environmental Correlations ◽  
Length Measurements ◽  
Swamp Buffalo ◽  
Heritability Estimates ◽  
Additive Genetic Effects

AbstractEstimates of genetic parameters were obtained for weight, hip height, heart girth and shoulder to pin length measurements on Thai swamp buffalo, recorded at birth and weaning. Direct heritability estimates were 0·26 for weights at both ages and were low for skeletal measurements, ranging from 0·11 to 0·19. Low values could, in part at least, be caused by inaccuracies in recording. All traits were subject to maternal effects, permanent environmental maternal effects on traits recorded at weaning explaining proportionately up to 0·14 of the total variation. Estimates of genetic (direct and maternal) and permanent environmental correlations between traits recorded at the same time were high throughout, ranging from 0·83 to 0·97 for additive genetic effects and being close to unity otherwise. Except for heart girth measured at weaning, there appeared to be comparatively little genetic association between traits recorded at different times, direct additive correlation estimates ranging from 0·18 to 0·55 in contrast to estimates of 0·38 to 0·65 for correlations with heart girth at weaning.

scholarly journals Typical Errors in the Writing of the Students Participating in Mawapres Selection in ITS Surabaya

2015 ◽  
Vol 6 (1) ◽  
pp. 61-70
Author(s):  
Hermanto Hermanto
Keyword(s):  
Classification System ◽  
English Abstract ◽  
The Common ◽  
Error Classification ◽  
Selection For ◽  
Speaking Performance ◽  
National Selection ◽  
Writing Errors ◽  
Selection Of ◽  
Made In

One of the elements in the selection of the “ITS Heroes 2015” to be the candidates for National Selection for Student Competition (Mawapres) is the ability of the participants to communicate in English in the form of writing and speaking performance. In the writing performance, the participants must submit an English abstract of their papers, and in the speaking performance, the participants are required to tell themselves in English. From these two evaluation items, the abstract is more interesting to analyze in terms of the writing errors the participants made in it. This paper presents the analysis of the common writing errors made by the participants of “ITS Heroes 2015”. The errors are categorized and analyzed based on the checklist items by adopting Kim (2009)’s error classification system, which is based on Dulay, Burt, and Krashen’s classification system.

scholarly journals Selection For Resistance and Tolerance to Oat Mosaic Virus and Oat Golden Stripe Virus in Hexaploid Oats

Plant Disease ◽  
1998 ◽  
Vol 82 (4) ◽  
pp. 423-427 ◽  
Author(s):  
Scott L. Walker ◽  
Steven Leath ◽  
J. Paul Murphy ◽  
Steven A. Lommel
Keyword(s):  
Mosaic Virus ◽  
Yield Loss ◽  
Breeding Lines ◽  
Foliar Symptoms ◽  
Symptomatic Tissue ◽  
Multiple Determination ◽  
Selection For ◽  
F2 Generation ◽  
Resistant Genotypes ◽  
Selection Of

Coker 716, a hexaploid oat cultivar resistant to both oat mosaic virus (OMV) and oat golden stripe virus (OGSV) was crossed to three susceptible cultivars (Brooks, Madison, and Tech) to form three individual populations. Individual breeding lines were derived from each cross in the F2 generation and tested in plots consisting of equally spaced individual hills in OMV- and OGSV-infested soils and non-infested soils to evaluate resistance and yield loss of individual lines. Foliar symptoms, harvest index, and yield loss were examined as selection criteria for resistant genotypes. The study was conducted over 2 years at two North Carolina locations that differed in soil type and climate. Multiple regression models describing yield loss in each cross due to rating, year, and location were calculated. Coefficients of multiple determination in these models ranged from 0.39 to 0.51. Yield loss ranged from 39 to 60% among different crosses. Infection by OMV and OGSV accounted for the majority of yield loss in two of the populations. Disease severity varied widely over years and locations. The results suggest that selection of lines with symptomatic tissue of 10% or less, or selection of tolerant lines, is needed for breeding progress.

Early generation selection for yield and its related traits in soybean [Glycine max (L.) Merrill.]

2016 ◽  
Author(s):  
Tejbir Singh ◽  
Amitesh Sharma
Keyword(s):  
Selection Criteria ◽  
Early Generation ◽  
Mean Values ◽  
Single Character ◽  
Glycine Max L ◽  
Selection For ◽  
F2 Generation ◽  
Selection Group ◽  
Efficient Selection ◽  
Selection Of

The relative efficiency of different selection criteria in early generation (F2) was evaluated in two crosses of soybean. The selection criteria used were (i) selection of plants in F2 generation having high and low mean values for different characters, (ii) randomly selected plants and (iii) selection of plants based on an index involving highest mean values for the different characters. The selection group patterns of F3 selected F4 progeny revealed that (a) plants selected for single character identified more number of F4 progenies than on the basis of an index and randomly selected plants in both the crosses, (b) plants selected for their high mean values further screened more number of F4 progenies than having low means, and (c) selection of plants in F2 generation based on number of pods per plant proved most efficient selection criteria for seed yield improvement.

scholarly journals Additive Genetic Effects of RNF4, RBP4, and IGF2 Polymorphisms on Litter Size in Landrace and Yorkshire Sows

2019 ◽  
Vol 2 (1) ◽  
pp. 314-320 ◽  
Author(s):  
Vinh Thi Nguyen ◽  
Luc Duc Do ◽  
Thinh Hoang Nguyen ◽  
Bo Xuan Ha ◽  
Mai Ngoc Hoang ◽  
...  
Keyword(s):  
Litter Size ◽  
Reproductive Traits ◽  
Genetic Effects ◽  
Additive Effects ◽  
Selection For ◽  
Additive Genetic Effects

The association of the RNF4, RBP4, and IGF2 genotypes and their additive genetic effects with litter size in purebred Landrace and Yorkshire sows were studied. The results revealed significant associations between the RNF4 and RBP4 genotypes with the total number of piglets born (TNB) and number of piglets born alive (NBA) traits (P <0.05). The RNF4 CC genotype had greater TNB and NBA than the TT genotype in both breeds. The RBP4 BB genotype had greater TNB and NBA than the AA genotype in the Landrace breed. Significant additive effects of the RNF4 and RBP4 genes on the TNB and NBA were detected (P <0.05). No significant associations of the IGF2 genotypes and their additive effects with any reproductive traits were observed in both Landrace and Yorkshire sows (P >0.05). The results suggested that the RNF4 and RBP4 genes could be useful in selection for increasing TNB and NBA traits in pigs.

scholarly journals Combining ability and heritability estimates of main agronomic characters in rapeseed breeding lines using line × tester analysis

2012 ◽  
Vol 57 (3) ◽  
pp. 111-120 ◽  
Author(s):  
Valiollah Rameeh
Keyword(s):  
Seed Yield ◽  
Combining Ability ◽  
Yield Components ◽  
Seed Weight ◽  
Oil Content ◽  
Genetic Effects ◽  
Narrow Sense Heritability ◽  
Breeding Lines ◽  
Heritability Estimates ◽  
Additive Genetic Effects

To estimate the general and specific combining ability (GCA and SCA) effects of plant height, yield components, seed yield and oil content, three testers and six lines of spring type of rapeseed varieties were crossed using line ? tester fashion. Significant mean squares of parents and crosses for all the traits indicated significant genetic variation among the parents and their F1 crosses. Significant mean squares of parents vs crosses revealed significant average heterosis for all the traits except seeds per pod, 1000-seed weight and oil content. High narrow-sense heritability estimates for all the traits except seeds per pod, indicating the importance of additive genetic effects for these traits. Due to more importance of additive genetic effects for most of the traits, only a few of the crosses exhibited significant SCA effects. A significant positive correlation between seed yield and some of yield components including pods on main axis, pods per plant and 1000-seed weight indicates that these traits can be used as suitable selection criteria for improving of seed yield. The crosses including Opt ? R01, RG06 ? R01, RG06 ? R08 and RGS3 ? R08 with 3241.91, 3213.68, 3334.28 and 3237.45 kg ha-1 of seed yield detected as prior combinations for improving of this trait and all of these combinations had also positive SCA effect for this trait.

scholarly journals Heritability estimates for body weight and height at withers in Brazilian army horses

2012 ◽  
Vol 42 (12) ◽  
pp. 2246-2251 ◽  
Author(s):  
Priscilla Regina Tamioso ◽  
Tiago Rafael Cosmo ◽  
Concepta Margaret McManus Pimentel ◽  
Laila Talarico Dias ◽  
Rodrigo de Almeida Teixeira
Keyword(s):  
Body Weight ◽  
Genetic Effects ◽  
Complete Data ◽  
The Other ◽  
Individual Selection ◽  
Age Classes ◽  
Linear Effect ◽  
Linear Effects ◽  
Selection For ◽  
Selection Of

The aim of this study was to estimate the heritability for weight and height at withers of 260-780 days of age No Defined Breed (NDB) horses, at intervals of 40 days, which belong to the Brazilian Army cavalry. Thus, the model considered the direct genetic effects as random ones, as fixed, the effects of sex and year of birth and the linear effects of height at withers and age, as covariates for the analysis of body weight, whereas for the analysis of height, the linear effect of weight was included as a covariate. For the complete data, the estimated heritability coefficients were 0.40±0.034 and 0.70±0.019 for weight and height at withers, respectively, indicating that individual selection for these traits may be effective. On the other hand, for the data subdivided into age classes, the heritability coefficients ranged between 0.04 and 0.77 for weight, with the highest estimation for the class between 440 and 480 days of age, which indicates a higher possibility of weight selection during this period. For height, the heritability values ranged between 0.08 and 0.98, being the highest estimate found between 300 and 340 days of age, corroborating, thus, to the selection of the trait at this age.

scholarly journals Partner Selection in China Interorganizational Patent Cooperation Network Based on Link Prediction Approaches

2021 ◽  
Vol 13 (2) ◽  
pp. 1003
Author(s):  
Wei Chen ◽  
Hui Qu ◽  
Kuo Chi
Keyword(s):  
Social Networks ◽  
Link Prediction ◽  
Geographical Location ◽  
Partner Selection ◽  
Basic Properties ◽  
Cooperation Network ◽  
The Common ◽  
Patent Applications ◽  
Selection For ◽  
Selection Of

To enhance competitiveness and protect interest, an increasing number of organizations cooperate on patent applications. Partner selection has attracted much more attention because it directly affects the success of patent cooperation. By collecting some cooperative patents applied for by different categories of organizations in China from 2007 to 2015, an interorganizational patent cooperation network was built for this paper. After analyzing certain basic properties of the network, it was found that the network possessed some typical characteristics of social networks. Moreover, the network could be divided into communities, and three communities were selected to analyze as representative. Furthermore, to explore the partner selection in the patent cooperation network, eight link prediction approaches commonly used in social networks were introduced to run on another interorganizational patent cooperation network built by the patents applied for in 2016. The precision metric results of the eight link prediction approaches show that they are effective in partnership prediction; in particular, the Common Neighbors (CN) index can be effectively applied to the selection of unfamiliar partners for organizations in patent cooperation. Moreover, this paper also verified the trust transitivity based not only on historical cooperation but also on geographical location, and the complementarity of capabilities still plays an important role in partner selection for organizations.

scholarly journals Assessing gene action for hypoxia tolerance in cotton (Gossypium hirsutum L.)

2019 ◽  
pp. 51-62
Author(s):  
Altaf Hussain ◽  
Zafar Ullah Zafar ◽  
Habib-Ur-Rehman Athar ◽  
Jehanzeb Farooq ◽  
Saghir Ahmad ◽  
...  
Keyword(s):  
Genetic Effects ◽  
Hypoxia Tolerance ◽  
Narrow Sense Heritability ◽  
Partial Dominance ◽  
Additive Component ◽  
Hypoxic Environment ◽  
High Heritability ◽  
Selection For ◽  
Additive Genetic Effects ◽  
F1 Generation

Introduction. The inheritance studies on hypoxia tolerance in cotton are very scanty. Objective. The objective of this work was to study the inheritance pattern of seed cotton yield, ginning out-turn, and fiber length under normal and hypoxia conditions. Materials and Methods. An 8•8 diallel mating system was employed in F1 generation of cotton. The experiment was conducted during the years 2011-2012 at Cotton Research Institute, Multan, Pakistan. Results. Analysis of variance revealed significant variation (P<0.01) for all the traits under both non-stress and flooding stress conditions. The value of regression coefficient b deviated significantly from zero but not from unity for all the traits which enabled further analysis of the data. The additive component (D) was significant for all the traits and this has more values than the values of dominance components H1 and H2, which clearly indicates the preponderance of additive genetic effects. Under normal and hypoxia conditions the estimates of narrow sense heritability were higher. Conclusion. Predominance of additive genetic effects, high heritability along with partial dominance under both conditions suggested that selection for these traits under hypoxic environment at early generation will be useful.

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