Adaptability, stability, productivity and genetic parameters in slash pine second-generation families in early age

AbstractThe study was conducted to estimate the stability, adaptability, productivity and genetic parameters in Slash pine second-generation half-sib families, considering phenotypic traits in early age. Forty-four families from a first generation seed orchard in Colombo-PR, Brazil, were used in this study. Two progenies tests were established in a randomized complete block design. The first test was implemented in March 2009 in Ribeirão Branco, São Paulo state, containing 40 blocks, one tree per plot, 44 treatments (progenies) and 6 controls. Another test was implemented in Ponta Grossa, Paraná state, using the same experimental design and number of plants per plot, and with 24 treatments, 32 blocks. The growth traits evaluated were total height, diameter at breast height (dbh) and wood volume, within five years. The form traits evaluated were stem form, branch thickness, branch angle, number of branches, fork and fox tail five years after planting. Deviance analysis and estimates of stability, adaptability, productivity and genetic parameters were performed using the methods of best linear unbiased predictor (BLUP) and residual maximum likelihood (REML). There was significant variation among progenies for growth and form traits. Considerable genetic variation was detected mainly for wood volume. High coefficients of genetic variation and heritability showed low environmental influence on phenotypic variation, which is important for the prediction of genetic gain by selection. Crosses between different progenies individuals groups will be prioritized for obtaining heterotics genotypes and increase the probability of obtaining high specific combining ability.

Download Full-text

Genetics and expected selection gain for growth traits in Eugenia dysenterica DC. populations

Bragantia ◽

10.1590/s0006-87052009000300009 ◽

2009 ◽

Vol 68 (3) ◽

pp. 629-637 ◽

Cited By ~ 4

Author(s):

Ananda Virginia de Aguiar ◽

Roland Vencovsky ◽

Lázaro José Chaves ◽

Mara Fernandes Moura ◽

Lizz Kezzy de Morais

Keyword(s):

Genetic Variation ◽

Genetic Parameters ◽

Growth Traits ◽

Block Design ◽

Genetic Material ◽

Germplasm Collection ◽

Seed Orchard ◽

Seedling Seed Orchard ◽

Randomized Block Design ◽

Eugenia Dysenterica

The objective of this study was to estimate genetic parameters of quantitative traits in a living germplasm collection of Eugenia dysenterica. The genetic material consisted of 110 progenies derived from 10 natural Eugenia dysenterica subpopulations sampled in the southeastern region of the state of Goiás. The experiment was established in a complete randomized block design, with 110 treatments, four replications and one tree per plot. The study variables were total height, stem diameter and respective growth rates. After the analysis of variance some genetic parameters were estimated. The levels of genetic variation in the collection were high and the highest proportion was found within subpopulations. Highest coefficients of heritability and genetic variation were observed in subpopulations from the counties Catalão, Três Ranchos, Cristalina and Senador Canedo. Considering the promising expected progress for growth traits, this collection can be converted into an unrogued seedling seed orchard, aiming the production of improved seed.

Download Full-text

Genetic parameters and responses to selection for pre-weaning growth in suffolk and texel sheep

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200590462 ◽

1995 ◽

Vol 1995 ◽

pp. 48-48

Author(s):

I.W. Purvis ◽

J.P. Hanrahan

Keyword(s):

Growth Rate ◽

Genetic Variation ◽

Genetic Gain ◽

Genetic Parameters ◽

Growth Traits ◽

Present Report ◽

Growth Data ◽

Genetic Trend ◽

Breeding Objective ◽

Selection For

In order to evaluate genetic gain in populations under selection it is necessary to be able to partition the observed response into genetic and environmental components. This requires estimates of the appropriate genetic and environmental (co)variances unless appropriate genetic controls are available. Growth rate is an important component of the breeding objective for sheep breeds used as terminal sires and, whereas older estimates of the contribution of genetic variation to differences in preweaning growth indicated heritabilities of the order of 0.1, more recent studies have indicated considerably higher values. The present report concerns analyses of preweaning growth data on purebred Suffolk and Texel sheep to estimate genetic parameters for preweaning growth traits and genetic trend in growth rate from birth to weaning.

Download Full-text

Genetic divergence among slash pine second generation progenies at an early age

Scientia Forestalis ◽

10.18671/scifor.v48n126.01 ◽

2020 ◽

Vol 48 (126) ◽

Author(s):

Maximiliano Kawahata Pagliarini ◽

Wesllen Schuhli Kieras ◽

Juliana Prado Moreira ◽

Valderes Aparecida de Sousa ◽

Jarbas Yukio Shimizu ◽

...

Keyword(s):

Genetic Divergence ◽

Second Generation ◽

Slash Pine ◽

Early Age

Download Full-text

Genetic Variation of Anatolian Black Pine (Pinus nigra Arnold. subsp. pallasiana (Lamb.) Holmboe) in the Lakes District of Turkey

Silvae Genetica ◽

10.1515/sg-2008-0001 ◽

2008 ◽

Vol 57 (1-6) ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

S. Gülcü ◽

A. Ö. Üçler

Keyword(s):

Genetic Variation ◽

Population Differentiation ◽

Growth Traits ◽

Block Design ◽

Morphological Characteristics ◽

Black Pine ◽

Family Selection ◽

Individual Tree ◽

Seedling Traits ◽

Anatolian Black Pine

Abstract In this study, morphological characteristics of juvenile 1- and 2-year-old seedlings of Anatolian black pine were studied to estimate the amount of genetic variation and heritability of seedling traits of the species in the Lakes District of Turkey. This nursery study involved 460 parent trees from 23 populations in a randomized complete block design. Traits studied were the number and length of cotyledons, hypocotyls and epicotyls lengths, weight and length of initial roots, height, root collar diameter, and stem and root fresh weights, and number of buds. Variation was higher among than within populations with individual tree heritability ranging from 0.09 to 0.76, whereas family mean heritability ranged from 0.16 to 0.80. Genetic and phenotypic correlations between juvenile and 1-year-old seedling traits were generally the same sign and magnitude. Variation and heritabilities were higher for growth-related traits than the number and length of embryonic tissues. The observed level of population differentiation was low, possibly due limited geographic sampling of populations, which spanned only 2° of latitudes and longitudes, and 300m in elevation. If the observed heritabilities for growth traits were sustained to tree maturity combined family and within family selection would be effective in improving growth of this species in the Lakes District of Turkey. A broader geographic sampling is recommended for better estimation of population differentiation and establishment of the geographic pattern of the species in this region.

Download Full-text

Selection for Growth Traits on M1V1 Generation of Raja Bulu Banana (Musa paradisiaca Linn.) Obtained by Gamma Rays Irradiation

Caraka Tani Journal of Sustainable Agriculture ◽

10.20961/carakatani.v36i1.34492 ◽

2020 ◽

Vol 36 (1) ◽

pp. 97

Author(s):

Nandariyah Nandariyah ◽

Endang Yuniastuti ◽

Sukaya Sukaya ◽

Sonia Ika Yudhita

Keyword(s):

Genetic Variation ◽

Gamma Rays ◽

Gamma Ray ◽

Growth Traits ◽

Block Design ◽

Mutation Breeding ◽

High Yield ◽

Early Maturity ◽

Musa Paradisiaca ◽

Gamma Ray Irradiation

<a name="_Hlk39513249"></a>Raja Bulu is one of the banana varieties favored by the community because of its thick fruit flesh and sweet taste. However, its parthenocarpic characteristic and vegetative propagation make this banana variety has limited genetic variation. Attempt to improve the genetic variation was conducted through induced mutation breeding using gamma-ray mutagens. This research aimed to select M1V1 generation of Raja Bulu banana (Musa paradisiaca Linn.) obtained by gamma rays’ irradiation for their growth traits which are expected to produce banana varieties that have an early maturity and high yield. This study used a randomized complete block design without replication by observing the generative growth of each individual of Raja Bulu banana irradiated by gamma rays and without radiation as a control. The results showed that gamma-ray irradiation treatment caused Raja Bulu banana to be harvested earlier and produced higher fruit weight than controls. The gamma-ray irradiation had a random influence on Raja Bulu bananas. The 10 Gy gamma-ray irradiation dosage influenced the morphological diversity in the generative phase of Raja Bulu banana. The treatment of gamma irradiation resulted in 5 individual plants that flowered and matured earlier as compared to controls.

Download Full-text

211 Changes in genetic parameters of fitness and growth traits under genomic selection in pigs

Journal of Animal Science ◽

10.1093/jas/skz258.081 ◽

2019 ◽

Vol 97 (Supplement_3) ◽

pp. 41-41

Author(s):

Jorge Hidalgo ◽

Shogo Tsuruta ◽

Daniela Lourenco ◽

Yijian Huang ◽

Kent Gray ◽

...

Keyword(s):

Genetic Variation ◽

Genomic Selection ◽

Variance Components ◽

Genetic Parameters ◽

Growth Traits ◽

Average Daily Gain ◽

Genetic Correlations ◽

Data Set ◽

Daily Gain ◽

Over Time

Abstract Genomic selection increases intensity of selection and decreases generation interval. However, intensive selection reduces genetic variation and can strengthen undesirable genetic correlations. The purpose of this study was to investigate changes in genetic parameters of litter size (LS), number born alive (NBA), number born dead (NBD) and average daily gain (ADG) and weight at off-test (WT) in pigs over time. The data set contained 20,086 (LS), 21,230 (NBA), 21,230 (NBD), 144,717 (ADG) and 144,718 (WT) phenotypic records. Pedigree file included 369,776 animals born between 2001 and 2018, of which 39,038 were genotyped. Two trait models were evaluated (LS-ADG, LS-WT, NBA-ADG, NBA-WT, NBD-ADG and NBD-WT) using 3-year sliding subsets starting from 2010. Variance components and genetic parameters were estimated using GIBBS2F90 program. Computations were performed with (BLUP) or without (ssGBLUP) genotypes. For BLUP (ssGBLUP), the changes in heritability from 2010–2012 to 2015–2018 were 0.08 to 0.09 (0.08 to 0.06) for LS, 0.33 to 0.24 (0.37 to 0.16) for ADG, 0.11 to 0.07 (0.10 to 0.07) for NBD, and 0.32 to 0.24 (0.38 to 0.17) for WT. Differences were also observed for genetic correlations as they were -0.23 to -0.73 (-0.31 to -0.58) for LS-ADG, -0.24 to -0.74 (-0.31 to -0.50) for LS-WT, -0.33 to -0.65 (-0.41 to -0.53) for NBA-ADG, -0.35 to -0.66 (-0.42 to -0.45) for NBA-WT, 0.12 to 0.04 (0.12 to 0.16) for NBD-ADG, and 0.11 to 0.05 (0.11 to 0.22) for NBD-WT. Genomic selection in pigs reduced heritabilities and emphasized the antagonistic relationship that are under strong selection. Heritabilities estimated from ssGBLUP declined more than those by BLUP while changes in the genetic correlations were smaller and more gradual by ssGBLUP. Differences between ssGBLUP and BLUP could be caused by genomic pre-selection unaccounted for by BLUP.

Download Full-text

Genetic parameters and responses to selection for pre-weaning growth in suffolk and texel sheep

Proceedings of the British Society of Animal Science ◽

10.1017/s0308229600028178 ◽

1995 ◽

Vol 1995 ◽

pp. 48-48

Author(s):

I.W. Purvis ◽

J.P. Hanrahan

Keyword(s):

Growth Rate ◽

Genetic Variation ◽

Genetic Gain ◽

Genetic Parameters ◽

Growth Traits ◽

Present Report ◽

Growth Data ◽

Genetic Trend ◽

Breeding Objective ◽

Selection For

Download Full-text

GENETIC PARAMETERS OF Eucalyptus spp. CLONES IN NORTHEASTERN BRAZIL

FLORESTA ◽

10.5380/rf.v50i2.62524 ◽

2020 ◽

Vol 50 (2) ◽

pp. 1267 ◽

Cited By ~ 1

Author(s):

Rodrigo Andrade Furlan ◽

Evandro Vagner Tambarussi ◽

Cristiano Bueno Moraes

Keyword(s):

Drought Tolerance ◽

Genetic Parameters ◽

Growth Traits ◽

Block Design ◽

Northeastern Brazil ◽

Soil Conditions ◽

Environment Interaction ◽

Mato Grosso ◽

Genotype X Environment ◽

Randomized Complete Block Design

Brazil is the largest charcoal producers in the world, with the main centers of charcoal consumption located in the states of Minas Gerais, Mato Grosso do Sul, Espírito Santo, Maranhão, and Pará. Planting of Eucalyptus in the northern and northeastern states of Brazil is relatively new and is limited the lack of genetic materials adapted to the region’s high temperatures and severe, prolonged periods of drought. The objective of this study was to assess the genetic parameters and variability and determine the genotype x environment interaction for drought tolerance in Eucalyptus clonal tests established in two environments in the municipality of Grajaú, Maranhão State, Brazil. The tests were planted in January 2011 in clayey and sandy soils in a randomized complete block design with 130 clones, one plant per plot, and 20 replicates. The studied clones showed high genetic variability for drought tolerance, with coefficients of relative variance () consistently greater than 0.8 for DBH and volume. This indicates high levels of genetic control and less influence of environmental factors on the phenotype, which allows for selection and obtaining gains through breeding. Heritability estimates were high for growth traits, with average clone heritabilities () greater than 0.85, as well as acuracies () above 0.9 for DBH and volume in clone selection. There was a simple interaction between genotype x environment for the clones under the two different soil conditions.

Download Full-text

Genetic Variation in Growth Traits of Two Years Old Ficus variegata Blume

Jurnal Wasian ◽

10.20886/jwas.v2i1.870 ◽

2015 ◽

Vol 2 (1) ◽

pp. 47

Author(s):

Liliek Haryjanto

Keyword(s):

Genetic Variation ◽

Survival Rate ◽

Growth Traits ◽

Block Design ◽

Genetic Parameter ◽

Family Effect ◽

Progeny Trial ◽

Diameter Variation ◽

Growth Variation ◽

Coefficient Of Genetic Variation

A progeny trial of nyawai (Ficus variegata Blume) with subline system was established in Mangunan, Bantul, Yogyakarta and designed as a Randomized Completely Block Design. Lombok subline comprised of 17 families and Cilacap-Pangandaran subline comprised of 19 families. This study was aimed to observe growth variation and genetic parameter of these sublines at two years after planting. Varians analysis was performed to find out family effect on survival, height, and diameter traits. Component varians analysis was used to estimate coefficient of genetic variation and heritability. This study showed that survival rate of the trial ranged from 89.01% to 91.42%. Family effect on height and diameter variation was very significant at both sublines. Estimation coefficient of genetic variation for height and diameter traits ranged from 4.41% to 9.04% or categorized as intermediate. Individual heritabilities for height traits ranged from 0.15 to 0.22; diameter ranged from 0.18 to 0.09, while family heritabilities for height and diameter traits ranged from 0.49 to 0.60 and 0.29 to 0.66 respectively.

Download Full-text

Genetic Variation among Robusta Coffee Genotypes for Growth and Yield Traits in Ghana

Journal of Agricultural Science ◽

10.5539/jas.v10n4p138 ◽

2018 ◽

Vol 10 (4) ◽

pp. 138 ◽

Cited By ~ 1

Author(s):

Abraham Akpertey ◽

Esther Anim-Kwapong ◽

Atta Ofori

Keyword(s):

Genetic Parameters ◽

Agronomic Traits ◽

Growth Traits ◽

Block Design ◽

Coffea Canephora ◽

Early Years ◽

Stem Diameter ◽

Growth And Yield ◽

Broadsense Heritability ◽

The Relationship

Quantifying the level of variation and estimates of genetic parameters are important to make informed decisions regarding the improvement of agronomic traits in Coffea canephora. The objectives of the present study were to assess the growth and yield performance of 54 C. canephora clones derived through ortet selection, based on yield from a previous hybrid trial; estimate genetic parameters of growth traits (stem diameter, height, span, number of laterals, length of laterals and diameter of laterals), and yield; and determine the relationship between yield and the growth traits. The clones were planted in the field in 2009 using a randomized complete-block design with three replications. Significant (p < 0.01) clone effects for all traits and broadsense heritability range of 0.15 (mean yield of last 3 productive years)-0.43 (diameter of laterals) were observed. Stem diameter was moderately and positively correlated with early years’ yield (2012/13 mean yield, r = 0.49; p < 0.001), late years’ yield (2014 to 2016 mean yield, r = 0.44; p < 0.001), and mean yield across five years (r = 0.42; p = 0.001). Relatively high genotypic coefficient of variation and expected genetic advance values were obtained for the evaluated traits, which indicated a high probability of success of selection for these traits.

Download Full-text