scholarly journals Recurrent Selection for Yield in Soybeans

1969 ◽  
Vol 59 (3) ◽  
pp. 222-232
Author(s):  
W. R. Fehr ◽  
L. B. Ortiz
Keyword(s):  
Genetic Variability ◽  
Male Sterility ◽  
Genetic Gain ◽  
Recurrent Selection ◽  
Family Selection ◽  
Expected Gain ◽  
Hand Pollination ◽  
Principal Factors ◽  
Glycine Max L ◽  
Hill Plots

Procedures have been developed for yield testing of soybeans (Glycine max (L.) Merr.) that permit S1 testing with 1 year per cycle and S4 testing with 2 years per cycle. The principal factors in the program include efficient procedures for obtaining crossed seed by hand pollination, crossing and generation advance in Puerto Rico, and yield tests in Iowa by use of hill plots. Details for each of the three factors are discussed. With the facilities available, expected genetic gain per year for yield was calculated for S1 testing without male sterility (S1), S1 testing with male sterility S1(ST), S4 testing without male sterility (S4), and half-sib family selection with male sterility (HF). The greatest expected gain per year was obtained with S1 testing. There is more genetic variability among S4 lines than among S1 lines due to inbreeding, but expected genetic gain is less for S4 testing because 2 years are required per cycle. S1(ST) had less expected gain per year than S1 or S4 testing because 2 years are required per cycle if homozygous male-fertile genotypes are evaluated. Expected genetic gain was least for HF because less genetic variability is expressed among lines than for the other three methods.

GENETIC VARIABILITY AND EXPECTED GAIN IN THREE MAIZE POPULATIONS

2018 ◽  
Vol 17 (1) ◽  
pp. 135 ◽  
Author(s):  
ALINE CARDOSO SOUZA ◽  
JOSE BRANCO MIRANDA FILHO ◽  
AURILENE SANTOS OLIVEIRA ◽  
JEFFERSON FERNANDO NAVES PINTO ◽  
CAROLINA MESSIAS SILVA ◽  
...  
Keyword(s):  
Zea Mays ◽  
Genetic Variability ◽  
Grain Yield ◽  
Plant Height ◽  
Recurrent Selection ◽  
Additive Genetic Variance ◽  
Yield Potential ◽  
Maize Populations ◽  
Expected Gain ◽  
Ear Height

ABSTRACT - The study of genetic variability in populations undergoing recurrent selection is important to quantify their real potential for breeding purposes. In the present work, three semiexotic maize populations were evaluated on their yield potential and variability for continuing the recurrent selection program. Half-sib families representing three semiexotic populations CRE-01, CRE-02, CRE-03 were evaluated for yield and agronomic traits male flowering (MF), plant height (PH), ear height (EH), ear placement (EP) - ratio = (EH/PH), tassel length (TL), tassel branches (TN), final stand (FS), ears per plot (NE), prolificacy (PR), ear length (EL), ear diameter (ED), ear yield (EY), grain yield (GY). The observed means for grain yield (GY), in percent of the hybrid check, were 93.8%, 89.4%, and 94.6%, showing a relatively good yield potential. Means (cm) for plant height (PH) and ear height (EH) were 221, 237, 241 and 117, 134, 137, respectively, with reductions in relation to the first cycle. Parameters estimates for GY were: additive genetic variance 582.28, 406.70 and 238.11 g2.plant-1; heritability 59.17%, 49.82% and 38.53%; progeny mean basis, and expected gain for progeny selection 8.16%, 6.86% and 3.88%; selection intensity of 20%.Keywords: Zea mays, recurrent selection, semiexotic population, genetic parameters.VARIABILIDADE GENÉTICA E GANHO ESPERADO EM TRÊS POPULAÇÕES DE MILHORESUMO - O estudo da variabilidade genética em uma população sob seleção é importante para quantificar seu potencial para fins de melhoramento. No presente trabalho foram avaliadas três populações semiexóticas de milho quanto ao seu potencial de produção e de variabilidade para continuar o programa de seleção recorrente em curso. Famílias de meios irmãos representando as três populações (CRE-01, CRE-02, CRE-03) foram avaliadas para caracteres agronômicos florescimento masculino (MF), altura da planta (PH), altura da espiga (EH), posição relativa da espiga (EP), comprimento do pendão (TL), ramificações do pendão (TN), estande final (FS), espigas por parcela (NE), prolificidade (PR), comprimento da espiga (EL), diâmetro da espiga (ED), peso de espiga (EY), peso de grãos (GY). As médias observadas para produção de grãos (GY) foram 93,8%, 89,4% e 94,6% da testemunha, mostrando um bom potencial de produção. As alturas médias da planta (PH) foram 221, 237 e 241 cm e da espiga (EH) foram 117, 134 e 137 cm, com reduções em relação ao primeiro ciclo. As estimativas de parâmetros para GY nas três populações foram, respectivamente: variância genética aditiva 582,28 g2 planta-1, 406,70 g2 planta-1 e 238,11 g2 planta-1; coeficiente de herdabilidade em média de progênies 59,17%, 49,82% e 38,53% e ganho com seleção para 20% de intensidade de 8,16%, 6,86% e 3,88%; ganho com seleção para 5% de intensidade de 10,81%, 10,47% e 5,32%, respectivamente para as populações CRE-01, CRE-02 e CRE-03.Palavras-chave: Zea mays L., seleção recorrente, população semiexótica, parâmetros genéticos.

Realized genetic gain for 2nd-year height in jack pine

1989 ◽  
Vol 19 (6) ◽  
pp. 707-714 ◽  
Author(s):  
Thomas D. Rudolph ◽  
Hyun C. Kang ◽  
Raymond P. Guries
Keyword(s):  
Normal Distribution ◽  
Genetic Gain ◽  
Jack Pine ◽  
Base Population ◽  
Open Pollination ◽  
Family Selection ◽  
Expected Gain ◽  
Finite Base ◽  
Theoretical Population ◽  
Selection For

A complete cycle of within-family selection for 2nd-year height in jack pine (Pinusbanksiana Lamb.) was accomplished. The expected absolute gain from a theoretical population is 9.3%. The expected gain calculated using actual selected parental group means was 6.5% for upper selection and −6.5% for lower selection; realized gains were 5.1% for upper selection and −3.7% for lower selection. Reasons for reductions in the realized gain compared with expected gain include (i) a finite base population size; (ii) biological constraints such as inconsistent seed production; (iii) non-normal distribution for the trait of interest; and (iv) non selected male parents in open pollination.

scholarly journals Genetic variability of rice recurrent selection populations as affected by male sterility or manual recombination

2012 ◽  
Vol 47 (6) ◽  
pp. 808-814 ◽  
Author(s):  
Letícia da Silveira Pinheiro ◽  
Paulo Hideo Nakano Rangel ◽  
Rosana Pereira Vianello ◽  
Claudio Brondani
Keyword(s):  
Genetic Variability ◽  
Male Sterility ◽  
Ssr Markers ◽  
Simple Sequence Repeat ◽  
Recurrent Selection ◽  
Sequence Repeat ◽  
The One ◽  
Simple Sequence

The objective of this work was to determine the effect of male sterility or manual recombination on genetic variability of rice recurrent selection populations. The populations CNA-IRAT 4, with a gene for male sterility, and CNA 12, which was manually recombined, were evaluated. Genetic variability among selection cycles was estimated using14 simple sequence repeat (SSR) markers. A total of 926 plants were analyzed, including ten genitors and 180 individuals from each of the evaluated cycles (1, 2 and 5) of the population CNA-IRAT 4, and 16 genitors and 180 individuals from each of the cycles (1 and 2) of CNA 12. The analysis allowed the identification of alleles not present among the genitors for both populations, in all cycles, especially for the CNA-IRAT 4 population. These alleles resulted from unwanted fertilization with genotypes that were not originally part of the populations. The parameters of Wright's F-statistic (F IS and F IT) indicated that the manual recombination expands the genetic variability of the CNA 12 population, whereas male sterility reduces the one of CNA-IRAT 4.

Multivariate analysis to quantify genetic diversity and family selection in sour passion fruit under recurrent selection

Euphytica ◽  
2021 ◽  
Vol 217 (1) ◽  
Author(s):  
Amanda Fernanda Nunes Ferreira ◽  
Willian Krause ◽  
Maria Helena Menezes Cordeiro ◽  
Alexandre Pio Viana ◽  
Eileen Azevedo Santos ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Multivariate Analysis ◽  
Recurrent Selection ◽  
Passion Fruit ◽  
Family Selection ◽  
Sour Passion Fruit

COMPARISON OF HILL AND ROW PLOTS FOR AGRONOMIC AND QUALITY TRAITS IN SPRING MALTING BARLEY (Hordeum vulgare L.)

1990 ◽  
Vol 70 (1) ◽  
pp. 61-69 ◽  
Author(s):  
S. TRAGOONRUNG ◽  
P. M. HAYES ◽  
B. L. JONES
Keyword(s):  
Hordeum Vulgare ◽  
Recurrent Selection ◽  
Agronomic Traits ◽  
Malting Quality ◽  
Quality Traits ◽  
Malting Barley ◽  
Seeding Rate ◽  
Hordeum Vulgare L ◽  
Hill Plot ◽  
Hill Plots

Provided they reliably predict row plot performance, hill plots should be useful for doubled haploid recurrent selection in malting barley (Hordeum vulgare L.). The primary objective of this research was to compare hill and row plot expression of agronomic and malting quality traits in an array of elite spring habit barley germplasm grown under irrigated conditions. A supporting objective was to identify an appropriate seeding rate for hill plot evaluation. Eight-replicate hill plots at four seeding rates (10, 20, 30, and 40 seeds per hill) were compared with adjacent four-replicate row plots in each of three environments. Genotype and genotype × environment interactions were significant for most agronomic traits in both plot types. Significant, linear genotype responses to hill plot seeding rates were observed for most agronomic traits. Seeding rate had no consistent effect on the expression of malting quality. The percentage of lines in common in the two plot types at 25 and 50% selection intensities was the most useful comparison statistic and indicated hill plot selection should be effective for most agronomic and malting quality traits. Although yield heritability estimates were consistently high in both hill and row plots, there was little relationship between trait expression in the two plot types. Differential tillering in response to hill plot competition is likely responsible. A seeding rate of 10 seeds per hill should be appropriate in preliminary screening for traits amenable to hill plot selection in irrigated spring habit malting barley.Key words: Hordeum vulgare L., malting quality, breeding methods, barley

scholarly journals Genetic progress and potential of common bean families obtained by recurrent selection

2015 ◽  
Vol 15 (4) ◽  
pp. 218-226 ◽  
Author(s):  
Anatércia Ferreira Alves ◽  
José Ângelo Nogueira de Menezes Júnior ◽  
Vanessa Maria Pereira Silva Menezes ◽  
José Eustáquio de Souza Carneiro ◽  
Pedro Crescêncio Souza Carneiro ◽  
...  
Keyword(s):  
Common Bean ◽  
Genetic Gain ◽  
Recurrent Selection ◽  
Population Cycle ◽  
Base Population ◽  
Genetic Progress ◽  
Simultaneous Evaluation ◽  
Agronomically Important Traits

Abstract The objective of this study was to estimate the genetic gain of two recurrent selection cycles in common bean breeding and identify families with the potential to generate superior lines. The base population, cycle zero (C0), was obtained by combining 20 carioca bean parents, populations with favorable phenotypes for several agronomically important traits. The parents were recombined in a circulant diallel scheme, in which each parent participated in two crosses, generating 20 populations. From these populations, families were derived and evaluated for three seasons in the generations F2:3, F2:4 and F2:5. The same procedures of recombination and evaluation in C0 were performed in cycle one (CI). The genetic gain for yield, estimated from the simultaneous evaluation of the 40 best families of each cycle, was 8.6%. Families with potential to generate superior lines to cultivar Pérola were identified, especially among the CI families.

scholarly journals Estimate of genetic gain in popcorn after cycles of phenotypic recurrent selection

2016 ◽  
Vol 15 (2) ◽  
Author(s):  
H.J. Ematné ◽  
J.A.R. Nunes ◽  
K.O.G. Dias ◽  
P.E.R. Prado ◽  
J.C. Souza
Keyword(s):  
Genetic Gain ◽  
Recurrent Selection ◽  
Phenotypic Recurrent Selection

scholarly journals Selección para calidad fisiológica de la semilla y rendimiento en líneas S2 derivadas de cuatro poblaciones tropicales de maíz (Zea mays L.)

2016 ◽  
Vol 7 (1) ◽  
pp. 58
Author(s):  
Enrique Navarro ◽  
Cristina Vega ◽  
Fernando Narváez ◽  
Hugo Córdova
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Agronomic Traits ◽  
Reciprocal Recurrent Selection ◽  
Laboratory Conditions ◽  
Flower Plant ◽  
Ear Height ◽  
Field And Laboratory Conditions

This study was carried out in 1993 to evaluate S2 lines from four maize tropical populations improved by reciprocal recurrent selection. These lines were evaluated under field and laboratory conditions, the latter one to determine physiology quality. The main goal was to measure genetic variability within and among populations for traits such as grain yield, vigor and germination and to select the best lines under field and laboratory conditions. The combined analysis of variance showed great genetic variability among the S2 lines within and among populations for grain yield, days to flower, plant and ear height, among others. The maximum genetic variability was observed on the lines from population 43 and pool 23 for most of the traits, although the latter showed a greater genetic variability for grain yield. Besides, it is important to mention that the above populations included the best genotypes for grain yield, germination and vigor. Taking into account the above mentionel agronomic traits, fifteen lines were selected; 2 belong to population 43* pool 20, 2 from pool 19* pool 23, 8 from population 43, and 3 from pool 23. These results confirm the genetic superiority of the lines from populations 43 and pool 23, so that these populations should be recommended for future genetic improvement by reciprocal recurrent procedures.

scholarly journals Studies of Genetic Variability, Heritability and Genetic Gain for Some Important Horticultural Traits in Cauliflower (Brassica oleracea var. botrytis L.)

2018 ◽  
Vol 7 (04) ◽  
pp. 82-92
Author(s):  
Subhrajyoti Chatterjee ◽  
Debmala Mukherjee ◽  
Omkar Aralikatti ◽  
Sumit Patil ◽  
Hardyal Singh Kanwar ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Brassica Oleracea ◽  
Genetic Gain ◽  
Horticultural Traits

Genetic variability for root morph-architecture traits and root growth dynamics as related to phosphorus efficiency in soybean

2010 ◽  
Vol 37 (4) ◽  
pp. 304 ◽  
Author(s):  
Junhua Ao ◽  
Jiabing Fu ◽  
Jiang Tian ◽  
Xiaolong Yan ◽  
Hong Liao
Keyword(s):  
Genetic Variability ◽  
Root Growth ◽  
Recombinant Inbred Lines ◽  
Growth Dynamics ◽  
Root Traits ◽  
Phosphorus Efficiency ◽  
P Efficiency ◽  
Glycine Max L ◽  
Positive Correlations

Root morphology and architecture are believed to be important for plant phosphorus (P) efficiency, but their genetic information is relatively scarce. In the present study, a field and a specially designed minirhizotron experiments were conducted using two soybean (Glycine max L. Merr.) genotypes and their 88 recombinant inbred lines (RILs) to elucidate the genetic variability for root morph-architecture traits and root growth dynamics as related to P efficiency in soybean. The results indicated that the root morph-architecture traits were continually segregated in the RILs with a normal distribution, indicating which are possibly controlled by quantitative trait loci. Significantly positive correlations were found between root and P traits, suggesting feasibility of screening P efficient genotype through simple selection of root traits in field. Most root morph-architecture traits were closely correlated, showing a coordinating contribution to P efficiency. Furthermore, root morphological traits always had higher heritability than architecture traits, thus, could serve as more reliable index in field selection. The dynamic parameters of root growth from the minirhizotron experiment showed that the P efficient genotype established longer and larger root system with preferring distribution in surface layer and also kept more active roots, therefore, had a better growth performance in field, than the P-inefficient genotype. Taken together, this is the first report on in situ root growth dynamics and its relation to P efficiency using minirhizotron systems in crops. Our findings help to better understand the relationships between P efficiency and root traits and, thus, facilitate development of P efficient genotypes in crops.

Sign in / Sign up

Export Citation Format

Share Document