The impact of genotype multiply environment interactions for sugar yield on the use of indirect selection in southern Queensland

1993 ◽  
Vol 33 (5) ◽  
pp. 629 ◽  
Author(s):  
PDN Mirzawan ◽  
M Cooper ◽  
DM Hogarth
Keyword(s):  
Pattern Analysis ◽  
Relative Magnitude ◽  
Indirect Selection ◽  
Sugar Yield ◽  
Genetic Advance ◽  
Genotype X Environment ◽  
Sugarcane Varieties ◽  
Selection Analysis ◽  
Efficiency Of Selection ◽  
The Impact

To develop a strategy to improve the efficiency of selection, indirect selection and pattern analysis were used to examine the magnitude and form of genotype x environment (GE) interactions for sugar yield in sugarcane clones in southern Queensland. Clone x location interactions were the predominant source of clone X environment interactions and were much larger than clone x crop-year and clone x location x crop-year interactions. Both the indirect selection study and the pattern analysis emphasised the relative magnitude of these sources of interactions. Pattern analysis strongly associated crop classes at each location, and indirect selection analysis emphasised an opportunity to exploit correlated genetic advance between crop classes within a location. These suggest that more emphasis should be placed on sampling a greater number of locations than on the testing of clonal ratooning ability within locations. This would improve the chances of obtaining both broadly and specifically adapted sugarcane varieties.

Genotype × environment interactions in sugarcane. II. Use of performance in plant cane as an indirect selection criterion for performance in ratoon crops

1992 ◽  
Vol 43 (7) ◽  
pp. 1461 ◽  
Author(s):  
PA Jackson
Keyword(s):  
Genetic Correlations ◽  
Selection Criterion ◽  
Relative Yield ◽  
Indirect Selection ◽  
Sugar Yield ◽  
Ratoon Crop ◽  
Breeding Programs ◽  
Sugarcane Breeding ◽  
Efficiency Of Selection ◽  
Plant Crop

This study aimed to determine whether sugar yield of sugarcane genotypes in the plant crop could be used to predict relative yield in subsequent ratoon crops. Results from two series of trials, planted in 1985 and 1986, were examined. Within each series genotypes were planted at four locations and evaluated in plant, first ratoon and second ratoon crops. The genotypes used had not been selected previously in the test environments. Genetic correlations between sugar yield in plant and ratoon crop-years were moderate to high (greater than 0.65) for most locations. The relative efficiency of selection for yield in ratoon crop-years via indirect selection in the plant crop-year averaged 0.67. Realized gains from selection were compared for selection based on only plant crop results and selection based on average performance across all crop-years (the latter being the method routinely used in sugarcane breeding programs at present). In most cases the increases in realized gains in yield across independent environments brought about by considering results from more than the plant crop-year were small or non-existent. In the two series of trials, 11 and 12 of the top ranking 15 genotypes, respectively, based on mean performance across all crop-years, were also in the top 15 genotypes based on only the plant crop results. It is suggested that the testing of genotypes in only the plant crop may be appropriate in the early stages of selection in sugarcane breeding programs. Resources otherwise allocated to testing early stage material in ratoon crops may be more usefully employed elsewhere such as testing in more sites, with more replicates or more genotypes. It is emphasized, however, that this strategy may not be appropriate for highly selected populations, such as those in the final stages of selection, where genetic variance and genetic correlations between crop-years would be expected to be smaller than those obtained in this study.

Interactions Between Natural Selection, Recombination and Gene Density in the Genes of Drosophila

Genetics ◽  
2002 ◽  
Vol 160 (2) ◽  
pp. 595-608 ◽  
Author(s):  
Jody Hey ◽  
Richard M Kliman
Keyword(s):  
Gene Expression ◽  
Natural Selection ◽  
Recombination Rate ◽  
Codon Bias ◽  
Gene Density ◽  
Drosophila Genome ◽  
Functional Variation ◽  
Subtle Effect ◽  
Efficiency Of Selection ◽  
The Impact

AbstractIn Drosophila, as in many organisms, natural selection leads to high levels of codon bias in genes that are highly expressed. Thus codon bias is an indicator of the intensity of one kind of selection that is experienced by genes and can be used to assess the impact of other genomic factors on natural selection. Among 13,000 genes in the Drosophila genome, codon bias has a slight positive, and strongly significant, association with recombination—as expected if recombination allows natural selection to act more efficiently when multiple linked sites segregate functional variation. The same reasoning leads to the expectation that the efficiency of selection, and thus average codon bias, should decline with gene density. However, this prediction is not confirmed. Levels of codon bias and gene expression are highest for those genes in an intermediate range of gene density, a pattern that may be the result of a tradeoff between the advantages for gene expression of close gene spacing and disadvantages arising from regulatory conflicts among tightly packed genes. These factors appear to overlay the more subtle effect of linkage among selected sites that gives rise to the association between recombination rate and codon bias.

scholarly journals Pattern analysis of S. haematobium infection and elimination in the area of Alsuki, Sudan

2021 ◽  
Vol 8 (3) ◽  
pp. 1059
Author(s):  
Rawia A. Abdelshafie ◽  
Abdalla I. Abdalla Mohamed
Keyword(s):  
Risk Factors ◽  
Statistical Analysis ◽  
Health Program ◽  
Pattern Analysis ◽  
Cross Sectional Study ◽  
P Value ◽  
Sectional Study ◽  
Cross Sectional ◽  
The People ◽  
The Impact

Background: The aim of this study was to determine the current conditions of children of the selected area, for the purpose of measuring the new effective health program for schistosomiasis disease eliminations and obtain the prevalence intensity and risk factors of S. haematobium among school children in the study area.Methods: A descriptive cross-sectional study was used to screen school going children of all the ages from five randomly selected schools from Alsuki region. A statistical analysis derived from data formulated based on 1062 samples aged between 6 and 15 years attending the selected schools during the period testing within 6 months were enrolled.Results: The impact of health awareness program was measured usefully and the responded factor for reducing the Schistosomiasis diseases was significantly became less than (0.05). Therefore, the actual qualified fitting degree and applicability was significantly becoming (p value=0.001).Conclusions: This research concluded that the prediction of Schistosomiasis diseases due to the risk Ratio of the collected data for those who did not attended awareness over the people who attended program became (0.248).

Identification of Transgressive Segregants and Variability Studies in Segregating Generations of Four Crosses in Chickpea

2021 ◽  
Author(s):  
P. Sundaram ◽  
S. Samineni ◽  
S.B. Sajja ◽  
S.P. Singh ◽  
P. Joshi ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Genetic Advance ◽  
The Past ◽  
Breeding Programmes ◽  
Additive Gene ◽  
Transgressive Segregants ◽  
Efficiency Of Selection ◽  
100 Seed Weight ◽  
Number Of Seeds ◽  
Made In

Background: An impressive progress has been made in development and promotion of extra-large kabuli chickpea varieties in India during the past decade. As a result, India has become from importer to exporter of kabuli chickpea. The breeding programmes need to continue efforts on enhancing genetic gain in breeding kabuli chickpea varieties through increasing genetic variability and precision and efficiency of selection. This study was aimed at evaluating early segregating generations of chickpea to assess genetic variability for various important traits. Methods: Four large-seeded kabuli chickpea genotypes (JGK 2, KAK 2, KRIPA and ICC 17109); were crossed with a common small-seeded kabuli genotype (ICC 16644). F1, F2 and F3 along with parents were evaluated under normal field conditions and observations were recorded on various phenological, morphological and yield traits. Data was analysed to estimate genetic variability, heritability and genetic advance in the segregating populations.Result: Considerably high variability was observed in F2 and F3 populations of all the crosses. Heritability estimates in broad sense were high coupled with high genetic advance as per cent of mean for days to first flower, days to pod initiation, number of pods per plant, number of seeds per plant and 100-seed weight which indicated the presence of additive gene action for these traits. Large number of transgressive segregants was identified for number of seeds per plant followed by number of pods per plant and yield per plant. The most promising transgressive segregants could be used in future breeding programme. 

scholarly journals Estimates of genetic variability in vegetable amaranth (A. tricolor) over different cuttings

2011 ◽  
Vol 32 (No. 2) ◽  
pp. 60-67 ◽  
Author(s):  
S. Shukla ◽  
A. Bhargava ◽  
A. Chatterjee ◽  
A. Srivastava ◽  
S. P Singh
Keyword(s):  
Genetic Variability ◽  
Protein Content ◽  
Plant Height ◽  
Leaf Size ◽  
Indirect Selection ◽  
Stem Diameter ◽  
Genetic Advance ◽  
Plant Leaves ◽  
General Protein ◽  
Selection Parameters

The present investigation was carried out to study different selection parameters for foliage yield and its important yield contributing traits in 29 strains of vegetable amaranth (A. tricolor). The data were recorded for plant height (cm), stem diameter (cm), branches/plant, leaves/plant, leaf size (cm<sup>2</sup>), and protein content (mg/100 mg) in each cutting separately. Foliage yield (kg) was recorded on plot basis comprising 4 cuttings. The highest foliage yield per plot was recorded for strain AV-38, followed by AV-23 and AV-31. In general, protein content was high in the 2<sup>nd</sup> cutting in all strains. The heritability estimates were in general high for all the characters in all the cuttings and ranged from 74.87% to 93.33%. Genetic advance was maximum for foliage yield (42.50%), followed by leaf size (31.02%) and stem diameter (21.13%). It was concluded that foliage yield could be increased substantially in vegetable amaranth through indirect selection based on the characters leaf size and stem diameter. &nbsp;

Contexts of Trends in the Catholic Church's Male Workforce:Chile, Ireland, and Poland Compared

2016 ◽  
Vol 40 (3) ◽  
pp. 405-432 ◽  
Author(s):  
Brian Conway
Keyword(s):  
Labor Market ◽  
Vatican Ii ◽  
Pattern Analysis ◽  
Moderate Increase ◽  
Critical Events ◽  
Theoretical Contribution ◽  
Time Period ◽  
Market Trends ◽  
Defection Rate ◽  
The Impact

Using case pattern analysis, this study examines Catholic male workforce trends in the majority Catholic countries of Chile, Ireland, and Poland. Employing denominational data for three categories of church male professionals in the 1950–2010 time period, I document four important trends. First, ordinations to the diocesan priesthood in Ireland went into decline especially after Vatican II, have been relatively stable in Chile with only a moderate increase in the 1990s, and spiked in Poland in the 1980s, 20 years after Vatican II. Second, in all three countries the average defection rate among diocesan seminarians increased in the 2000s compared with the earlier two decades. Third, the religious priest workforce has declined in Chile, has been relatively stable in Ireland until the 2000s, and is growing in Poland. Fourth, from the late 1960s there has been a decline in the workforce of religious brothers in each country, especially in Ireland. The theoretical contribution to the Catholic workforce literature is discussed in terms of a critical events argument emphasizing the impact of Vatican II, prophetic stances, sexual scandals, and papal visits on labor market trends. I conclude with implications for the study of religion and society in general.

scholarly journals Relationships between carbohydrates and reproductive development in chardonnay grapevine: impact of defoliation and fruit removal treatments during four successive growing seasons

OENO One ◽  
2014 ◽  
Vol 48 (4) ◽  
pp. 219 ◽  
Author(s):  
Nathalie Vaillant-Gaveau ◽  
Geneviève Wojnarowiez ◽  
Anne-Noëlle Petit ◽  
Lucile Jacquens ◽  
Laurent Panigai ◽  
...  
Keyword(s):  
Sexual Reproduction ◽  
Sugar Yield ◽  
Yield Potential ◽  
Total Acidity ◽  
Fruit Removal ◽  
Alcohol Content ◽  
Plant Weight ◽  
Carbohydrate Reserves ◽  
Entire Plant ◽  
The Impact

<p style="text-align: justify;"><strong>Aim</strong>: The present study was conducted in grapevines to evaluate the influence of source/sink disturbance on reserve restoration in the entire plant (trunk, roots) and the consequences on reproduction, yield, sugar yield, potential alcohol content and total acidity over four successive years of treatment.</p><p style="text-align: justify;"><strong>Methods and results</strong>: At véraison, either total defoliation or total fruit removal was performed on Chardonnay plants grown in vineyards. The impact was measured each year on reproductive parameters and after four years on both plant weight and carbohydrate content. Defoliation induced an alteration in carbohydrate distribution in the entire plant, as revealed by decrease of starch content and parallel increase of soluble sugar content. These modifications affected the number of inflorescences/clusters per plant the year after. By contrast, fruit removal resulted in a significant increase of carbohydrate reserves in the whole plant, although the efficiency of sexual reproduction was not improved the year after.</p><p style="text-align: justify;"><strong>Conclusion</strong>: Results confirm the close correlation between carbohydrate reserves and the efficiency of sexual reproduction. Moreover, grapevine is able to adapt the number of both inflorescences and flowers according to the amount of available carbohydrate reserves in perennial organs.</p><p style="text-align: justify;"><strong>Significance and impact of the study</strong>: The quality of the crop is affected by defoliation, as shown by the decrease in yield and sugar yield. However, the impact on potential alcohol content and total acidity was less pronounced.</p>

scholarly journals Biological fundamentals of hardneck garlic productivity of different reproductions

2021 ◽  
Vol 1 (98) ◽  
pp. 126-141
Author(s):  
V. V. Yatsenko ◽  
Keyword(s):  
Raw Materials ◽  
Selection Process ◽  
Physiological State ◽  
Sharp Decrease ◽  
Research Field ◽  
Planting Material ◽  
National University ◽  
Efficiency Of Selection ◽  
General Studies ◽  
The Impact

Providing the population with food, agriculture with planting material, and raw materials for the processing and canning industries is an urgent problem of garlic production. Currently, not studied yet the passage and changes in the production processes of garlic plants under the influence of reproduction, which in some way constrains the industrial production of planting material and marketable products in general. Studies on the impact of reproductions on changes in physiological state, plant resistance to disease and productivity were conducted during 2017–2020 in the research field of the Department of Vegetable Growing, Uman National University of Horticulture. During the biometric measurements, a significant change in the variation of approbation traits (height of the plant and scape, number of leaves and its size, number and weight of bulbils, cloves in the bulb) of garlic plants under the influence of reproduction, ie variety testing must indicate what is this generation. There was a significant decrease in the concentration of chlorophyll and the antioxidant enzymes activity in the leaves in III–V reproductions, which significantly affected the productivity and tolerance of plants. Indicators of plant damage disease on a natural infectious background indicated a sharp decrease in the resistance of plants of the Sofiivskyi cultivar in IV–V reproductions, Prometei and Lyubasha cultivarss in III–V. It was found that in the cultivar Sofiivskyi the largest mass of the bulb was formed in the first reproduction, while in the cultivars Prometheus and Lyubasha – in the second, and its gradual decrease to 21.2 % in the fifth reproduction. Yield had a similar trend, where the maximum reduction in yield was observed at 18.2; 28.0 and 17.0 % in the cultivars Sofiivskyi, Prometei and Lyubasha. The developed scientifically substantiated provisions will allow to increase efficiency of selection process and production of seed material.

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