Genetic parameters and selection of soybean lines based on selection indexes

In the improvement of pumpkins, the selection based on one or a few characters of interest tends to be less efficient, leading to a superior product only compared to the few characters selected. To maximize the simultaneous selection of multiple characteristics of interest, selection indexes are used to obtain a numerical value resulting from the combination of the characters on which the simultaneous selection is to be practiced. The objective of this study was to determine genetic parameters and the most appropriate selection indexes in strains of Summer squash (C. pepo). Statistical analyzes were performed based on 65 genotypes belonging to the vegetable germplasm bank of the Federal University of Uberlândia. The variables analyzed were: leaf area index, precocity, SPAD index, productivity. plant-1, number of fruits. Plant-1, leaf temperature, NDVI index and NDRE index. The indexes were used: Smith (1936) and Hazel (1943), the sum of “Ranks” by Mulamba and Mock (1978), and Willians (1962). The selection methodologies selected ten individuals (15% of the genotypes). The values found for h² (%) ranged from 36.92% (SPAD) to 59.65% (cycle). The values obtained in the CVg / CVe quotient were below 1, varying from 0.18 for leaf temperature to 0.70 for the cycle, with the other variables close to 0.5. The CVg genetic variation coefficient (%) was also low, ranging from 1.84% for leaf temperature to 30.94% for productivity. The greatest gains obtained with direct and indirect selection were for the characters productivity (35.92%), NDRE (33.04%), number of fruits (28.93%) and leaf area index (22.72%). The Mulamba and Mock (1978) index showed the highest total selection gain value, providing a balanced distribution of selection gains, choosing the genotypes: 8, 31, 34, 38, 42, 64, 65, 66, 67 and 68.

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Reduction of traits for genetic evaluation of linear described traits in the Old Kladruber horse

Czech Journal of Animal Science ◽

10.17221/5891-cjas ◽

2012 ◽

Vol 57 (No. 4) ◽

pp. 160-170 ◽

Cited By ~ 1

Author(s):

L. Vostrý ◽

J. Přibyl ◽

P. Šimeček

Keyword(s):

Genetic Similarity ◽

Genetic Parameters ◽

Selection Index ◽

Genetic Parameter ◽

Genetic Correlations ◽

Principal Component ◽

Parameter Estimates ◽

Selection Indexes ◽

Measure Of Uncertainty ◽

Selection Of

The estimated genetic parameters were used for selection of important conformation traits and reduction in the number of the described characteristics. For reduction in the number of described traits from the original 36 to 24, the traits were selected according to: measure of genetic similarity (cluster analysis), measure of uncertainty multidimensional quantity, value of the variance of aggregate genotype, value of the variance of selection index and correlation of trait to the first principal component of the genetic matrix. Reduction in the number of the described traits was based on the value of heritability coefficient and genetic correlations matrix. The reliabilities of selection indexes were estimated between 0.41 and 0.53. Among the three multivariate analysis methods evaluated in this study, the variance of selection index had the highest reliabilities of selection indexes. The estimation of selection index variance which omitted traits with low heritability coefficient and high genetic correlation was the most suitable for the traits selection. This procedure would enable the breeders to reduce field costs (e.g. time, labour) required for obtaining the genetic parameter estimates necessary for a specific breeding programme.  

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Agro-Morphological Characterization and Assessment of Variability in Aromatic Rice Germplasm

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v37i1.11168 ◽

2012 ◽

Vol 37 (1) ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

M Parikh ◽

NK Motiramani ◽

NK Rastogi ◽

B Sharma

Keyword(s):

Genetic Parameters ◽

Agronomic Traits ◽

Morphological Characterization ◽

Aromatic Rice ◽

Spikelet Sterility ◽

Plant Parts ◽

Rice Germplasm ◽

Spikelets Per Panicle ◽

Plant Habit ◽

Selection Of

The present studies were carried out to characterize seventy-one aromatic rice germplasm from IGKV, Raipur. These germplasm were characterized and grouped on the basis of anthocyanin pigmentation, plant habit, and awning character. On the basis of pigmentation distribution in 10 plant parts, a total of twelve groups were formed with group one having no pigmentation and group twelve with pigmentation in 9 plant parts. On the basis of plant habit and awning character, three groups of each were formed. The genetic parameters for the ten agronomic traits indicated that the selection of genotypes may be done for fertile spikelets per panicle, spikelet density, spikelet sterility percentage, and hundred seed weight. Thus, on the basis of above characters, the genotypes Tulsi Mala, Baanspati, Ganga Balu, Samund Chini, Tulsi Amrit, Dudh Dhan, Kari Gilas, Shankar Jeera, and Jata Shankar may be selected for future study. DOI: http://dx.doi.org/10.3329/bjar.v37i1.11168 Bangladesh J. Agril. Res. 37(1): 1-8, March 2012

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Selection of cotton lines for high oil content

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2017000700007 ◽

2017 ◽

Vol 52 (7) ◽

pp. 530-538 ◽

Cited By ~ 3

Author(s):

Luiz Paulo de Carvalho ◽

Josiane Isabela da Silva Rodrigues ◽

Francisco José Correia Farias

Keyword(s):

Oil Content ◽

Genetic Parameters ◽

Fiber Quality ◽

Rio Grande ◽

Field Trials ◽

The State ◽

The Other ◽

Expected Gain ◽

High Heritability ◽

Selection Of

Abstract: The objective of this work was to evaluate the oil content and characters related to fiber quality and yield in cotton lines (Gossypium hirsutum), in order to select genotypes with high oil content and acceptable levels of the other characters. Twenty-two F6 lines and three checks were cultivated in three field trials - two in the municipality of Apodi, in the state of Rio Grande do Norte, and one in the municipality of Barbalha, in the state of Ceará, both in Brazil. The genetic parameters and the genetic gain from selecting 20% of the lines were estimated according to their means in each environment and in the group of environments. Regarding oil content, there is genetic variability, and the selection based on the overall mean is indicated, since this character showed high heritability, with 4.58% expected gain. The lines selected with this criterion have oil contents between 23.52 and 24.51%, which are higher than those of the Brazilian cultivar BRS Aroeira with the highest grain oil content (22.04%).

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Selection for rate and efficiency of lean gain in Hereford cattle 1. Selection pressure applied and direct responses

Animal Science ◽

10.1017/s0003356100005122 ◽

1990 ◽

Vol 51 (1) ◽

pp. 23-34 ◽

Cited By ~ 21

Author(s):

R. A. Mrode ◽

C. Smith ◽

R. Thompson

Keyword(s):

Genetic Parameters ◽

Control Line ◽

Correlated Responses ◽

Direct Response ◽

Lean Growth ◽

Hereford Cattle ◽

Frozen Semen ◽

Phenotypic Standard Deviation ◽

Selection For ◽

Selection Of

ABSTRACTSelection of bulls for rate and efficiency of lean gain was studied in a herd of Hereford cattle. There were two selection lines, one selected for lean growth rate (LGR) from birth to 400 days and the other for lean food conversion ratio (LFCR) from 200 to 400 days of age, for a period of 8 years. A control line bred by frozen semen from foundation bulls was also maintained. Generation interval was about 2·4 years and average male selection differentials, per generation were 1·2 and — 1·1 phenotypic standard deviation units for LGR and LFCR respectively.Genetic parameters and responses to selection were estimated from the deviation of the selected lines from a control line and by restricted maximum likelihood (REML) techniques on the same material. Realized heritabilities were 0·40 (s.e. 0·12) for LGR and 0·40 (s.e. 0·13) for LFCR using the control line. Corresponding estimates from REML were 0·42 (s.e. 0·10) and 0·37 (s.e. 0·14). The estimate of the genetic correlation between LGR and LFCR was about — 0·69 (s.e. 0·12) using REML.The estimates of direct annual genetic change using deviations from the control were 3·6 (s.e. 1·3) g/day for LGR and — 0·14 (s.e. 0·07) kg food per kg lean gain for LFCR. Corrsponding estimates from REML were similar but more precisely estimated. The correlated responses for LFCR in the LGR line was higher than the direct response for LFCR.

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Genetic parameters and estimated genetic gains in young rubber tree progenies

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2013000400009 ◽

2013 ◽

Vol 48 (4) ◽

pp. 411-416 ◽

Cited By ~ 4

Author(s):

Cecília Khusala Verardi ◽

Erivaldo José Scaloppi Junior ◽

Guilherme Augusto Peres Silva ◽

Lígia Regina Lima Gouvêa ◽

Paulo de Souza Gonçalves

Keyword(s):

Genetic Gain ◽

Genetic Parameters ◽

Block Design ◽

Rubber Tree ◽

First Year ◽

Genetic Gains ◽

Selection Gain ◽

Randomized Block Design ◽

Using Data ◽

Selection Of

The objective of this work was to assess the genetic parameters and to estimate genetic gains in young rubber tree progenies. The experiments were carried out during three years, in a randomized block design, with six replicates and ten plants per plot, in three representative Hevea crop regions of the state of São Paulo, Brazil. Twenty-two progenies were evaluated, from three to five years old, for rubber yield and annual girth growth. Genetic gain was estimated with the multi-effect index (MEI). Selection by progenies means provided greater estimated genetic gain than selection based on individuals, since heritability values of progeny means were greater than the ones of individual heritability, for both evaluated variables, in all the assessment years. The selection of the three best progenies for rubber yield provided a selection gain of 1.28 g per plant. The genetic gains estimated with MEI using data from early assessments (from 3 to 5-year-old) were generally high for annual girth growth and rubber yield. The high genetic gains for annual girth growth in the first year of assessment indicate that progenies can be selected at the beginning of the breeding program. Population effective size was consistent with the three progenies selected, showing that they were not related and that the population genetic variability is ensured. Early selection with the genetic gains estimated by MEI can be made on rubber tree progenies.

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Selection gains for the palm oil production from progenies of American oil palm with oil palm

Pesquisa Agropecuária Brasileira ◽

10.1590/s1678-3921.pab2021.v56.02321 ◽

2021 ◽

Vol 56 ◽

Author(s):

Rui Alberto Gomes Junior ◽

Alessandra Ferraiolo de Freitas ◽

Raimundo Nonato Vieira da Cunha ◽

Antônio José de Abreu Pina ◽

Higo Otávio Brochado Campos ◽

...

Keyword(s):

Palm Oil ◽

Oil Palm ◽

Genetic Parameters ◽

Recurrent Selection ◽

Oil Production ◽

Reciprocal Recurrent Selection ◽

Fresh Fruit Bunches ◽

Favorable Conditions ◽

Selection Of

Abstract The objective of this work was to estimate the genetic parameters, correlations, and selection gains for the oil production of interspecific hybrids progenies between American oil palm, of ‘Manicoré’ origin, and oil palm, of ‘La Mé’ origin. Thirty-nine progenies were evaluated from the sixth to the ninth year after planting, for the productivity of fresh fruit bunches (PROD_FFB), oil content in the bunch (OCB), and palm oil productivity (PROD_OP). The genetic parameters and gains from direct (GDS) and indirect (GIS) selection were estimated for PROD_OP. High values of heritability for the CVg/CVe ratio indicated favorable conditions for the selection. With the selection of 20% of the progenies (selection in both sexes), the following estimates were obtained: 11.15% GDS for PROD_OP, 9.1% GIS for OCB, and 8.1% GIS for PROD_FFB. The PROD_OP of the progenies was of 6,175, 6,057, and 5,995 kg ha-1 per year with GDS and GIS for OCB and PROD_FFB, respectively. The restricted selection of the LM2T male genitor offspring resulted in 5.1% estimated GSD and in a mean of 5,800 kg ha-1 per year for PROD_OP. Selection gains for PROD_OP can be achieved immediately through the selection restricted to oil palm male genitors, and, in the medium and long term, through the interspecific reciprocal recurrent selection between American oil palm and oil palm populations.

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Selection strategies in agronomic characters in progenies F3:4 of transgenic soy RR

Ciência e Agrotecnologia ◽

10.1590/1413-7054202145012421 ◽

2021 ◽

Vol 45 ◽

Author(s):

Anna Regina Tiago Carneiro ◽

Osvaldo Toshiyuki Hamawaki ◽

Ana Paula Oliveira Nogueira ◽

Arthur Felipe Eustáquio e Silva ◽

Raphael Lemes Hamawaki ◽

...

Keyword(s):

Agronomic Traits ◽

Indirect Selection ◽

Direct Selection ◽

Selection Strategies ◽

Aggregate Information ◽

Genetic Potential ◽

Superior Genotypes ◽

Selection Indexes ◽

Total Gain ◽

Selection Of

ABSTRACT The selection indexes aggregate information to multiple characters and, with this, they are able to carry out the selection of a set of variables simultaneously. The objective was to verify the genetic potential of agronomic traits and to select soybean F3:4 progenies based on different selection strategies. 123 progenies and the parents were sown in randomized blocks with two replications. The gains of direct selection by the indexes, the sum of “ranks” and the genotype-ideotype were lower for all characters when compared to the gains of direct and indirect selection. The rank sum index stood out for achieving the highest total gain with 37.11%. The index of the genotype-ideotype obtained a lower gain (-0.48%) for the character number of days for flowering compared to the sum index of “ranks” (-0.54%) and reached a negative gain for the attribute insertion height of the first pod with -1.82%. The genetic potential of the F3:4 population is high and allows different selection strategies to be applied to reach superior genotypes. The progenies UFU 72, UFU 116, UFU 86, UFU 45, UFU 117, UFU 56, UFU 5, UFU 106, UFU 6, UFU 4, UFU 73, UFU 101, UFU 96, UFU 90, UFU 123, UFU 116, UFU 88, UFU 65, UFU 70, UFU 3, UFU 69 and UFU 37 were selected by both selection indexes. The UFU 72, UFU 90, UFU 88 and UFU 69 progenies are agronomically superior both in direct and indirect selection, as in Mulamba and Mock (1978) sum of “ranks” selections and genotype-ideotype.

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Plant selection in F2 segregating populations of papaya from commercial hybrids

Cropp Breeding and Applied Biotechnology ◽

10.1590/s1984-70332012000300005 ◽

2012 ◽

Vol 12 (3) ◽

pp. 191-198 ◽

Cited By ~ 20

Author(s):

Eder Jorge Oliveira ◽

Gilberto de Andrade Fraife Filho ◽

Juan Paulo Xavier de Freitas ◽

Jorge Luiz Loyola Dantas ◽

Marcos Deon Vilela de Resende

Keyword(s):

Genetic Parameters ◽

Mixed Model ◽

Soluble Solids ◽

Fruit Firmness ◽

Plant Selection ◽

F2 Population ◽

The Common ◽

Mixed Model Methodology ◽

Fruit Diameter ◽

Selection Of

The objective of this paper was to estimate the genetic parameters and additive genetic values in segregating populations of papaya using the mixed model methodology. Two F2 populations from Tainung and Calimosa hybrids were evaluated. The experimental design was an augmented block with four replicates, and Golden and Calimosa cultivars were the common treatment. Estimates of individual heritability were high for fruit length (FL) and weight (FW), moderate for fruit diameter (FD), and low for total soluble solids (TSS) and fruit firmness (FF). Considering FF and TSS as main traits for selection, genotypes of Calimosa-F2 population showed better performance to FF, but worse concerning TSS. It was selected 18.3% and 24.6% of plants from Tainung-F2 and Calimosa-F2 populations, respectively. Negative correlation between TSS and FF was not able to reduce the genetic gains. The segregating populations from Calimosa hybrid are more promising for the selection of papaya lines.

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Assessment of genetic diversity and estimation of genetic parameters for remobilization related traits of wheat under drought conditions

Genetika ◽

10.2298/gensr1601139f ◽

2016 ◽

Vol 48 (1) ◽

pp. 139-149

Author(s):

Ezatollah Farshadfar ◽

Reza Amiri

Keyword(s):

Dry Matter ◽

Genetic Parameters ◽

Predominant Role ◽

Genetic Potential ◽

Cropping Season ◽

Additive Gene ◽

Genetic Techniques ◽

Selection Of ◽

Kernel Yield

In order to evaluate genetic variability and estimation of remobilization related traits in wheat using biometrical genetic techniques an experiment was conducted in a randomized complete blocks design with three replicates under post-anthesis drought stress conditions in the Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran during 2011-2012 cropping season. The results of analysis of variance showed significant differences between the genotypes for all studied traits except current photosynthesis (CP) and current photosynthesis share into kernel yield (CPSKY). High genetic gain and broad sense heritability estimates were observed for penultimate remobilization share into kernel yield (PenRSKY) and internodes remobilization share into kernel yield (IRSKY) indicating high genetic potential, low effect of environment and predominant role of additive gene effect on their expression. Spike dry matter remobilization (SDMR), spike dry matter remobilization efficiency (SDMRE) and spike remobilization share into kernel yield (SRSKY) exhibited the highest phenotypic and genetic positive correlation with kernel yield (KY). Moreover, the highest genotypic and phenotypic covariance was observed between kernel yield (KY) and SDMR, CP, SDMRE and SRSKY, respectively. The highest environmental covariance was identified between kernel yield (KY), peduncle dry matter remobilization (PedDMR) and penultimate dry matter remobilization (PenDMR), respectively. High co-heritability was detected between SDMRE and PedDMR, PedDMRE and PenDMR and between peduncle remobilization share into kernel yield (PedRSKY) and internodes dry matter remobilization efficiency (IDMRE), suggesting that selection of either of the traits would simultaneously affect the others, positively.

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