Concepts of varietal value and of test value in autotetraploids. Application to genetic advance in population improvement

Genome ◽  
1989 ◽  
Vol 32 (3) ◽  
pp. 420-424 ◽  
Author(s):  
A. Gallais
Keyword(s):  
Recurrent Selection ◽  
Testing System ◽  
Mass Selection ◽  
Genetic Advance ◽  
Reciprocal Recurrent Selection ◽  
Ability Test ◽  
Different Types ◽  
Population Improvement ◽  
Per Se ◽  
Double Cross

The application to autotetraploids of the concepts of varietal value and of test value allows the derivation of expressions of genetic advance for the different types of varietal values (per se value, line value, single-cross or double-cross values, synthesizing ability) according to the testing system used to select the intercrossed plants. Formulae are given for series of intrapopulation schemes and for reciprocal recurrent selection. With autotetraploids, if non-inbred plants are intercrossed and when epistasis is not involved, there is a contribution of additive effects and of dominance effects for the considered testing systems. However, it is shown that, except for mass selection or S1 selection devoted to improve the per se value of the population, the contribution of dominance is very low. The formulae are exactly the same as for diploids if the contribution of dominance variance is neglected.Key words: autopolyploid, quantitative genetics, varietal ability, test value, recurrent selection.

Genetic Advance in Grain Yield and Other Traits in Two Tropical Maize Composites Developed via Reciprocal Recurrent Selection

Crop Science ◽  
2018 ◽  
Vol 58 (6) ◽  
pp. 2360-2369
Author(s):  
Adesike O. Kolawole ◽  
Abebe Menkir ◽  
Essie Blay ◽  
Kwadwo Ofori ◽  
Jennifer G. Kling
Keyword(s):  
Grain Yield ◽  
Recurrent Selection ◽  
Genetic Advance ◽  
Reciprocal Recurrent Selection ◽  
Tropical Maize

scholarly journals Quantitative genetics of doubled haploid populations and application to the theory of line development.

Genetics ◽  
1990 ◽  
Vol 124 (1) ◽  
pp. 199-206 ◽  
Author(s):  
A Gallais
Keyword(s):  
Doubled Haploid ◽  
Recurrent Selection ◽  
Dominance Effect ◽  
Rapid Development ◽  
Testing System ◽  
Genetic Advance ◽  
Direct Test ◽  
Additive Variance ◽  
System A ◽  
A Value

Abstract The line value of a genotype is defined as the expected value of all lines that can be derived from this genotype. Specific genetic effects are defined for this value: only additive and additive by additive epistatic effects are necessary. There is no dominance effect for such a value. A general expression for the covariances between related lines is given. From a design with several lines per haplodiploidized plant taken at random from a population it is possible to estimate the additive variance for line value and the variance of additive by additive epistasis for line value. Variances of higher order epistasis can be estimated with a two-factor mating design in which a cross is replaced by the population of lines that can be derived from it. With a diallel or a factorial design a direct test for the presence of homozygous by homozygous epistasis is possible. The application of the concept of line value to the theory of line development leads to simple expressions of genetic advance in one cycle of recurrent selection according to the testing system. A brief consideration of these expressions leads to the conclusion that single doubled haploid descent recurrent selection will be one of the most efficient methods for low heritabilities and with a rapid development of doubled haploid lines.

The SUSPECT SYMPTOMS OF INBREEDING DEPRESSION AND THE HOMOZYGOSITY LEVEL OF FOURTH GENERATION OF SP450T AND FIFTH GENERATION OF DURA DELI OIL PALM SELFING POPULATION

2018 ◽  
Vol 24 (2) ◽  
pp. 55-66
Author(s):  
Rokhana Faizah ◽  
Sri Wening ◽  
Hernawan Yuli Rahmadi ◽  
Abdul Razak Purba
Keyword(s):  
Inbreeding Depression ◽  
Oil Palm ◽  
Recurrent Selection ◽  
Fourth Generation ◽  
Depression Symptoms ◽  
Reciprocal Recurrent Selection ◽  
Chain Reaction ◽  
Fifth Generation ◽  
Polymerase Chain ◽  
Simple Sequence

Inbreeding is a common method used to reproduce candidate mother plant from selected parental lines for commercial seeds in Reciprocal Recurrent Selection (RRS) oil palm breeding program. However this practice may increased homozigosity level of selected population. This study concerned the level of homozygosity of SP540T fourth generations and Dura Deli Dolok Sinumbah fifth generations (3 crosses respectively) and their correlation with inbreeding depression symptoms. Polymerase Chain Reaction-Simple Sequence Repeat (PCR-SSR) with 16 markers developed for oil palm was used to analyze 327 samples. The result shows that the levels of homozigosity of SP540T fourth selfing generation were ranged between 0.44-0.84 or 0.61 in average. While the levels of homozygosity of Dura Deli fifth selfing generations were ranged between 0.60-0.93 or 0.78 in average. The homozygosity level in Dura Deli was 1.27% higher than SP540T populations. Correlation analysis showed that the higher the level of homozygosity, the higher of the inbreeding symptoms 2 observed (R =0.95).

scholarly journals Combining Ability and Heterosis of Algerian Saharan Maize Populations (Zea mays L.) for Tolerance to No-Nitrogen Fertilization and Drought

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 492
Author(s):  
Meriem Riache ◽  
Pedro Revilla ◽  
Oula Maafi ◽  
Rosa Ana Malvar ◽  
Abderahmane Djemel
Keyword(s):  
Zea Mays ◽  
Stress Tolerance ◽  
Nitrogen Fertilization ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Base Material ◽  
N Fertilization ◽  
Nitrogen Stress ◽  
Reciprocal Recurrent Selection ◽  
Maize Populations

Drought and low nitrogen are major stresses for maize (Zea mays L.), and maize populations from the Sahara Desert are potential sources of stress tolerance. The objectives were to assess the tolerance and varietal and heterosis effects of Algerian populations under no-nitrogen fertilization and water stress. A diallel among six Algerian maize population was evaluated under drought (300 mm irrigation) vs. control (600 mm) and no-nitrogen fertilization vs. 120 kh ha−1 N fertilization. Genotypes showed significant differences and genetic effects for water- and nitrogen-stress tolerance. We propose a reciprocal recurrent selection to take advantage of additive and non-additive effects, using AOR and IGS, since they showed good performance in optimum and stress conditions, for improving yield heterosis for AOR × IGS. Negative effects are not expected on plant height, anthesis–silking interval or early vigor. These populations and BAH could be sources of inbred lines tolerant to drought and no-nitrogen fertilization. There was no relationship between origin and genetic group and stress tolerance per se or as parents of tolerant crosses. These populations and crosses could be used as base material among Algerian populations, for breeding programs focusing on tolerance to water or nitrogen stress.

A Comprehensive Breeding Procedure Utilizing Recurrent Selection for Peanuts1

1987 ◽  
Vol 14 (1) ◽  
pp. 1-3 ◽  
Author(s):  
E. Monteverde-Penso ◽  
J. C. Wynne ◽  
T. G. Isleib ◽  
R. W. Mozingo
Keyword(s):  
Systematic Approach ◽  
Recurrent Selection ◽  
Arachis Hypogaea L ◽  
Type Population ◽  
Three Stages ◽  
Population Improvement ◽  
Peanut Cultivars ◽  
Selection For ◽  
Pure Lines ◽  
Yield Trials

Abstract A comprehensive breeding procedure for peanut (Arachis hypogaea L.) consisting of three stages — till development of a genetically broad-based virginia-type population, recurrent selection without extensive crossing for continued population improvement, and isolation of pure lines from high yielding families at each cycle of selection was initiated in 1974. Forty S1 families in S3 generation were selected from each cycle of selection. Only five families from cycle 0 outyielded the check cultivar. Florigiant, whereas yield of all selected families from the next two cycles exceeded the yield of Florigiant. Pure lines isolated from high yielding cycle 0 families have yielded more than Florigiant in advanced yield trials. Use of this procedure provides a systematic approach in developing higher yielding peanut cultivars with a broad genetic base.

scholarly journals Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci

2003 ◽  
Vol 26 (3) ◽  
pp. 355-364 ◽  
Author(s):  
Luciana Rossini Pinto ◽  
Maria Lucia Carneiro Vieira ◽  
Claudio Lopes de Souza Jr. ◽  
Anete Pereira de Souza
Keyword(s):  
Genetic Structure ◽  
Microsatellite Loci ◽  
Recurrent Selection ◽  
Selection Effects ◽  
Reciprocal Recurrent Selection ◽  
Tropical Maize ◽  
Maize Populations

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

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.

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.

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