scholarly journals Sample size for family evaluation in potato breeding programs

2006 ◽  
Vol 30 (2) ◽  
pp. 277-282 ◽  
Author(s):  
Maria Cristina Duarte Rios Diniz ◽  
César Augusto Brasil Pereira Pinto ◽  
Eduardo de Souza Lambert
Keyword(s):  
Potato Breeding ◽  
Genetic Variance ◽  
Correlation Coefficients ◽  
Small Sample ◽  
Family Selection ◽  
Breeding Programs ◽  
Lattice Design ◽  
Experimental Variation ◽  
The Family ◽  
Tuber Specific Gravity

Clonal families from a broad genetic base population in the Potato Breeding Program at the Universidade Federal de Lavras (UFLA), Brazil, were used in this trials. Twenty-five families were assessed in a 5 x 5 triple lattice design. Each plot consisted of 30 clones distributed in three rows of ten plants. Tuber yield per plant, percentage of large tubers, mean weight of large tubers, mean medium-sized tuber weight and tuber specific gravity were measured. Three hundred experiments were simulated varying the family sizes from three to 90 clones. The coefficients of experimental variation (CVe), the coefficients of genetic variation (CVg), heritabilities for family mean and the CVg/CVe ratio were estimated. Genetic parameters were stabilized with family sizes as small as six clones, depending on the trait. This indicates that the families can be adequately represented by a small sample of clones. Using the maximum curvature method it is possible to conclude that approximately 30 clones would be sufficient to represent each family, even for traits with the highest CVe. The genetic variance within family was greater than the genetic variance among families for all traits, indicating a favorable potential for within family selection. The correlation coefficients of the family means with the 5%, 10%, 15% and 20% best clones from each family, considering the five traits assessed, were always high, meaning that within the best families generally are the best clones.

scholarly journals Heritability estimation in early generations of two-way crosses in soybean

Bragantia ◽  
2008 ◽  
Vol 67 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Marcelo Marchi Costa ◽  
Antonio Orlando Di Mauro ◽  
Sandra Helena Unêda-Trevisoli ◽  
Nair Helena Castro Arriel ◽  
Ivana Marino Bárbaro ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Genetic Variance ◽  
Selection Process ◽  
Broad Sense ◽  
Selection Methods ◽  
Narrow Sense ◽  
Breeding Programs ◽  
Heritability Estimation ◽  
The Family ◽  
Simple Selection

The estimation of genetic parameters, especially in early generations, is very useful for directing the selection process in breeding programs. The present research was undertaken to estimate heritabilities in the broad sense, narrow sense and using parent-offspring regression in F3 soybean populations from six two-way crosses, originated from the Soybean Breeding Program of Faculdade de Ciências Agrárias e Veterinárias (UNESP), Jaboticabal campus. It was used the family design with common checks located ten plots apart. It was observed highly significant differences among families. The experimental coefficient of variation (CVe), the CVg/CVe ratio and the heritability showed wide variation among traits, being the highest values found for number of pods, number of seeds and grain yield, making evident the existence of variance to be exploited by breeding. The estimation of the heritability coefficients in the broad sense, narrow sense and by regression were close in most of the situations, showing that the largest part of genetic variance is of additive nature, in which simple selection methods can lead to satisfactory genetic gains.

scholarly journals Sugarcane Family Selection and Genetic Parameter Prediction via the REML/BLUP Methodology

2019 ◽  
Vol 11 (11) ◽  
pp. 303
Author(s):  
Hugo Zeni Neto ◽  
Renato Frederico dos Santos ◽  
Luiz Gustavo da Mata Borsuk ◽  
Henrique Sanches Angeli ◽  
Guilherme Souza Berton
Keyword(s):  
Maximum Likelihood ◽  
Mixed Models ◽  
Genetic Parameter ◽  
Restricted Maximum Likelihood ◽  
Family Selection ◽  
Improvement Program ◽  
Breeding Programs ◽  
Program Selection ◽  
The Family ◽  
Parameter Prediction

Most sugarcane breeding programs tend to evaluate low heritability characteristics during the initial stages of genotype selection. Thus, family selection has been recently preferred. In this context, the aim of the present study was to select the best family among 78 sugarcane families, as well as estimate genetic values through the mixed models of restricted-maximum likelihood and best non-bias predictor (REML/BLUP) methodology, originating from the República Brasil 2005 (RB05) series. This strategy was deemed efficient, and 34 to 38 families were chosen from four evaluated characteristics underexplored by genetic researchers such as total plot mass (MTT), mean mass of one tiller in the plot (M1C), stature (EST), and mean number of canes per square meter (NCM). The family increments ranging from 6.02 to 82.11%, in the next genetic culture improvement program selection phases.

scholarly journals Genetic worth of multiple sets of cowpea breeding lines destined for advanced yield testing

Euphytica ◽  
2021 ◽  
Vol 217 (2) ◽  
Author(s):  
Patrick Obia Ongom ◽  
Christian Fatokun ◽  
Abou Togola ◽  
Oluwaseye Gideon Oyebode ◽  
Mansur Sani Ahmad ◽  
...  
Keyword(s):  
Seed Weight ◽  
Genetic Variance ◽  
Principal Component ◽  
Performance Tests ◽  
Genetic Advance ◽  
Breeding Lines ◽  
Lattice Design ◽  
Mean And Variance ◽  
Genotypic Coefficient Of Variation ◽  
Location Interaction

AbstractThe objective of this study was to determine genetic potentials in eight sets of cowpea lines for grain yield (GY), hundred seed weight (HSDWT) and days to 50% flowering (DT50FL). A total of 614 F6 genotypes constituting the sets, grouped by maturity, were evaluated across two locations in Northern Nigeria, in an alpha lattice design, two replications each. Data were recorded on GY, HSDWT and DT50FL.Variance components, genotypic coefficient of variation (GCV), and genetic advance (GA) were used to decode the magnitude of genetic variance within and among sets. Genetic usefulness (Up) which depends on mean and variance to score the genetic merits in historically bi-parental populations was applied to groups of breeding lines with mixed parentage. Principal component analysis (PCA) was used to depict contribution of traits to observed variations. GY and DT50FL explained the variance within and between sets respectively. Genotypes were significantly different, although genotype-by-location and set-by-location interaction effects were also prominent. Genetic variance (δ2G) and GCV were high for GY in Prelim2 (δ2G = 45,897; GCV = 19.58%), HSDWT in Prelim11 (δ2G = 7.137; GCV = 17.07%) and DT50F in Prelim5 (δ2G = 4.54; GCV = 4.4%). Heritability varied among sets for GY (H = 0.21 to 0.57), HSDWT (H = 0.76 to 0.93) and DT50FL (H = 0.20 to 0.81). GA and percentage GA (GAPM) were high for GY in Prelim2 (GAPM = 24.59%; GA = 269.05Kg/ha), HSDWT in Prelim11 (GAPM = 28.54%; GA = 4.47 g), and DT50F in Prelim10 (GAPM = 6.49%; GA = 3.01 days). These sets also registered high values of genetic usefulness, suggesting potential application in non-full sib populations. These approaches can be used during preliminary performance tests to reinforce decisions in extracting promising lines and choose among defined groups of lines.

scholarly journals MORPHOLOGICAL AND PRODUCTIVE CHARACTERIZATION OF FORAGE CACTUS VARIETIES

2015 ◽  
Vol 28 (3) ◽  
pp. 230-238 ◽  
Author(s):  
PHILIPE LIMA DE AMORIM ◽  
JANAINA AZEVEDO MARTUSCELLO ◽  
JOSÉ TEODORICO DE ARAÚJO FILHO ◽  
DANIEL DE NORONHA FIGUEIREDO VIEIRA DA CUNHA ◽  
LIANA JANK
Keyword(s):  
Block Design ◽  
Morphological Characteristics ◽  
Correlation Coefficients ◽  
Dry Mass ◽  
Negative Effects ◽  
Breeding Programs ◽  
Area Index ◽  
Promising Alternative ◽  
Randomized Block Design ◽  
Use Efficiency

ABSTRACT: Cultivars of the genus Nopalea are known in Brazil for being tolerant to cochineal carmine attacks, thus making the cultivation of this genus a promising alternative for mitigating the negative effects of this insect on the production of biomass. With the objectives of characterizing morphologically spineless forage cactus varieties and identify morphological characteristics that may be the focus in spineless forage cactus breeding programs, an experiment was conducted in a completely randomized block design with 11 treatments and four replications. The variety Alagoas showed the highest values of weight, area and volume of cladodes. The varieties Negro Michoacan F7 and V7, Tamazunchale V12 showed the highest values of the cladode area index, the total volume of cladodes and total fresh mass production. The varieties Negro Michoacan V7 and F7 presented the highest water use efficiency and dry mass yield. Cladode volume showed the highest correlation coefficients with the fresh weight of cladodes. Aiming the release of varieties for biomass production, varieties Negro Michoacan F7, V7 and Tamazunchale V12 may substitute the Miúda variety. The number and cladode area index may be used as criteria for selection of superior varieties in breeding programs.

scholarly journals Analysis of Factors Causing Appearance of Food Hypersensitivity in Toddlers

2021 ◽  
Vol 6 (2) ◽  
pp. 101-107
Author(s):  
O. I. Matsyura ◽  
◽  
Keyword(s):  
Family History ◽  
Young Children ◽  
Bronchial Asthma ◽  
Skin Diseases ◽  
Positive Family History ◽  
Correlation Coefficients ◽  
Food Hypersensitivity ◽  
Pathogenetic Mechanisms ◽  
The Family ◽  
The City

Food hypersensitivity is a reaction to the food consumed, regardless of the pathogenetic mechanisms that cause the symptoms. It is an actual and controversial problem in pediatric practice. Nowadays there is an active search for the causes of disease progression, a large role is given to the study of genetic and external factors (food, environmental, social). This disease arises many questions due to the similarity of the clinical representation in different kinds of food hypersensitivity and in different pathogenetic mechanisms, which are involved. The purpose of the study is to perform the analysis of factors, which cause appearance of food hypersensitivity in toddlers. Materials and methods. A study of the number of children with food intolerance was conducted using a specially compiled questionnaire. Thus, 4,500 questionnaires were distributed in pre-school and medical establishments to question parents. Results and discussion. Analysis of 3,214 questionnaires was conducted, which enabled to obtain information from parents on anamnesis and living conditions of toddlers. Values of 56 factors were analyzed, calculating correlation coefficients with a formation of food hypersensitivity for each of them. Statistical analysis allowed distinguishing 15 signs among these factors, which significantly correlated with the formation of food hypersensitivity in young children. The investigation enabled not only to detect factors that affect formation of food hypersensitivity in young children, but also to suggest a mathematical model of individual calculation of risk factors for this pathology. Data of conducted mathematical analysis can be used for elaboration of a complex of prophylaxis measures on development of food hypersensitivity in toddlers. Conclusion. The formation of hypersensitivity to cow's milk in children is provoked by the presence of contact reactions in the child, adverse reactions after medication, positive family history (bronchial asthma in relatives, skin diseases in parents (father and / or mother)), smoking in the family, living in the city; at the same time, preventive factors are living in an apartment, in a new building, in a dry apartment. The formation of food hypersensitivity in young children is generally provoked by a positive family history (bronchial asthma, hay fever, urticaria, diseases of the stomach and duodenum in relatives, skin diseases in parents), smoking in the family; frequent consumption of food in a mass catering points; living in the city plays a preventive role

Glycoalkaloid composition of wild and cultivated tuber-bearing Solanum species of potential value in potato breeding programs

1978 ◽  
Vol 26 (5) ◽  
pp. 1246-1248 ◽  
Author(s):  
Stanley F. Osman ◽  
Samuel F. Herb ◽  
Thomas J. Fitzpatrick ◽  
P. Schmiediche
Keyword(s):  
Potato Breeding ◽  
Solanum Species ◽  
Breeding Programs ◽  
Potential Value

scholarly journals Undergraduate nurses’ experience of the family health assessment as a learning opportunity

2012 ◽  
Vol 17 (1) ◽  
Author(s):  
Juliana J. Willemse ◽  
Elma W. Kortenbout
Keyword(s):  
Lived Experiences ◽  
Cultural Context ◽  
Phenomenological Study ◽  
Health Assessment ◽  
Family Health ◽  
Curriculum Planning ◽  
Future Research ◽  
Western Cape ◽  
Family Selection ◽  
The Family

The practice of community health nursing (CHN) may enhance the life experiences of families and communities, particularly amongst the poor and socially marginalised. CHN provides for a deeper understanding of the health status of families living within communities, for example, where and how they live, their cultural context and their ability to identify resources available to assist with their health care (Allender, Rector & Warner 2010:17).This qualitative phenomenological study reflects on the self-reported lived experiences of undergraduate CHN students at the University of the Western Cape in the City of Cape Town, South Africa. These students conducted a family health assessment (FHA) learning task at the homes of families within communities.Purposive and convenience sampling was used by students who had conducted an FHA. Fourteen students agreed to participate in the study, of whom nine were interviewed, two withdrew and the remaining three were not interviewed since no new data were emerging during interviews, indicating that saturation had been reached.During in-depth interviews with seven female and two male students, data for the exploration of the lived experiences was gathered through the following question: ‘How did you experience the FHA?’ Field notes were taken and used to capture non-verbal communication of participants. The focus of the study was to explore the lived experiences of students and not those of the family on whom the FHA was completed.Data collected were categorised into themes, guided by the systematic data analysis process of Tesch (1990) cited in Cresswell (2003:192). Four themes emerged: challenges of family selection, challenges of safety, socio-cultural challenges and academic challenges experienced by the participants. This study will inform future research and curriculum planning for CHN education in a multifaceted context.OpsommingDie praktyk van gemeenskapsgesondheidverpleging (GGV) het die potentiaal om die lewenservaringe van families en gemeenskappe te verryk, veral in arm en voorheen benadeelde gemeenskappe. GGV verskaf ‘n dieper begrip met betrekking tot die welstand van families in hulle gemeenskappe, byvoorbeeld, waar en hoe hulle leef, hul kultuur en hulle vermoë om beskikbare hulpbronne te identifiseer om sodoende hulle gesondheid te bevorder (Allender, Rector & Warner 2010:17).Hierdie kwalitatiewe fenomonologiese studie is ʼn refleksie op die self-gerapporteerde persoonlike ervaringe van voorgraadse gemeenskapsgesondheidverpleging studente (VGVS) verbonde aan die Universiteit van Wes Kaapland, in Kaapstad, Suid-Afrika. Hierdie studente het as ʼn werksopdrag ʼn familie gesondheidsberaming (FGB) by wonings van gesinne in die gemeenskap voltooi.ʼn Gerieflikheids- en doelgerigte steekproefneming is gedoen met studente wat die FGB voltooi het. Veertien studente het ingestem om aan die studie deel te neem, waarvan daar onderhoude met nege gevoer is. Twee studente het onttrek en die oorblywende drie is nie genader nie weens die feit dat daar geen nuwe data na vore gekom het nie, wat daarop dui dat saturasie bereik was.Data vir die verkenning van persoonlike ervaringe is deur in-diepte onderhoude met sewe vroulike en twee manlike studente ingesamel deur die volgende vraag te vra: ‘Wat was jou ervaring met die voltooing van die FGB?’ Veldnotas was geneem om nie-verbale kommunikasie van die studente aan te teken. Die fokus van die studie was gerig om die persoonlike ervarings van die VGVS te verken met verwysing na die FGB wat hulle voltooi het. Die fokus was nie gerig op die ondervindinge van die familie op wie die FGB gedoen is nie.Die ingesamelde data is in temas gekategoriseer volgens die sistematiese data analitiese proses van Tesch (1990), soos omskryf in Cresswell (2003:192). Vier temas is geïdentifiseer naamlik: uitdagings ten opsigte van die keuring van ‘n geskikte familie: uitdagings ten opsigte van veiligheid, sosiokulturele uitdagings en akademiese uitdagings soos ervaar is deur die deelnemende studente. Die belangrikheid van die studie is om toekomstige navorsing en kurrikulumbeplanning in gemeenskapsgesondheidverpleging binne ‘n diverse konteks te bevorder.

Unsubstantiated conclusions about the Family Star Plus as an outcome measure: a rebuttal to Sweet, Winter, Neeson and Connolly (2020)

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anna Good ◽  
Joy MacKeith
Keyword(s):  
Ordinal Data ◽  
Design Methodology ◽  
Outcome Measure ◽  
Small Sample Size ◽  
Statistical Significance ◽  
Reliability And Validity ◽  
Small Sample ◽  
Content Type ◽  
Outcomes Measures ◽  
The Family

Purpose The purpose of this article is to explain why Sweet et al.'s assertions are not well founded and raise unsubstantiated doubt over the use of the Family star Plus and the Outcomes Star suite of tools as outcomes measures. Design/methodology/approach Evidence is presented of flaws in the analysis, reporting and conclusions of an article published in this journal (Sweet et al., 2020). Findings Sweet et al. failed to mention a body of Outcomes Star validation work, including over 20 online reports and a manuscript they had seen of a now published article supporting the reliability and validity of the Family Star Plus (Good and MacKeith, 2020). There are significant issues with their methodology, presentation of results and conclusions including: reliance on statistical significance with a small sample size; use of statistics not intended for ordinal data and; and inappropriate conclusions from convergence with measures conceptually different to the Family Star Plus. Originality/value Evidence is presented that the Family Star Plus is a useful and valid outcome measure and that Sweet et al.’s conclusions can be attributed to issues with their methodology and interpretation.

Evaluation and genetic analysis of common bean genotypes (Phaseolus vulgaris L.) at Dibatie and Mandura, Northwestern Ethiopia

2021 ◽  
Vol 7 (5) ◽  
pp. 82-90
Author(s):  
Gezahegn Tefera ◽  
Keyword(s):  
Genetic Variability ◽  
Common Bean ◽  
Coefficient Of Variation ◽  
Environmental Variability ◽  
Genetic Constitution ◽  
Genetic Advance ◽  
Breeding Programs ◽  
Days To Flowering ◽  
Lattice Design ◽  
Component Traits

Assessing and understanding the variations existing in crops due to genetic composition and environmental variability is very important in order to exploit the genetic constitution of crop plants. To this aim, variability measures such as phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV) are commonly used. Heritability and genetic advance are major concerns for common bean to identify important traits for common bean genetic improvement. The field experiment was conducted at Mandura and Dibatie research substations working with sixteen genotypes of the common bean during 2017/2018 in lattice design with three replications to evaluate the performance of common bean genotypes and estimate the genetic variability. Heritability and genetic advance were estimated in relation to yield and its component traits for future breeding programs. Combined analysis of variance across locations revealed highly significant variations among genotypes for all traits under study. The PCV ranged from 3.36% for days to flowering to 15.91% for a number of pods per plant while the GCV value ranged from 0.75% for days to flowering to 13.74% for the number of pods per plant. Broad sense heritability values ranged from 5.00% for days to flowering to 84.61% for a hundred seed weight. Generally, the result of the study showed that significant genetic variability among tested genotypes and a simple selection for effective improvement of these traits. Keywords: common bean, genetic variability, genetic advance, heritability

scholarly journals Sequential Path Analysis for Determination of Relationship Between Yield and Yield Components in Bread Wheat (Triticum aestivum.L.)

2014 ◽  
Vol 6 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Mohtasham MOHAMMADI ◽  
Peyman SHARIFI ◽  
Rahmatollah KARIMIZADEH
Keyword(s):  
Grain Yield ◽  
Path Analysis ◽  
Plant Height ◽  
Canopy Temperature ◽  
Correlation Coefficients ◽  
Early Growth ◽  
Spike Length ◽  
Lattice Design ◽  
Growth Vigor ◽  
Positive Direct

An experiment was conducted to evaluate 295 wheat genotypes in Alpha-Lattice design with two replications. The arithmetic mean and standard deviation of grain yield was 2706 and 950 (kg/ha),respectively. The results of correlation coefficients indicated that grain yield had significant and positive association with plant height, spike length, early growth vigor and agronomic score. Whereas there were negative correlation coefficients between grain yield and days to physiological maturity and canopy temperature before and during anthesis. Path analysis indicated agronomic score and plant height had high positive direct effects on grain yield, while canopy temperature before and during anthesis, and days to maturity, wes another trait having negative direct effect on grain yield. The results of sequential path analysis showed the traits that accounted as a criteria variable for high grain yield were agronomic score, plant height, canopy temperature, spike length, chlorophyll content and early growth vigor, which were determined as first, second and third order variables and had strong effects on grain yield via one or more paths. More important, as canopy temperature, agronomic score and early growth vigor can be evaluated quickly and easily, these traits may be used for evaluation of large populations.

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