Variance components for yield and specific gravity in a diploid potato population after two cycles of recurrent selection

2001 ◽  
Vol 78 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Kathleen G. Haynes
Keyword(s):  
Specific Gravity ◽  
Variance Components ◽  
Recurrent Selection ◽  
Diploid Potato

scholarly journals Selection for Tuber Characters Can Maintain High Specific Gravity in a Diploid Potato Breeding Population

HortScience ◽  
1990 ◽  
Vol 25 (2) ◽  
pp. 227-228 ◽  
Author(s):  
K.G. Haynes ◽  
F.L. Haynes
Keyword(s):  
Specific Gravity ◽  
Recurrent Selection ◽  
Breeding Population ◽  
High Specific Gravity ◽  
Solarium Tuberosum ◽  
Hybrid Population ◽  
Base Population ◽  
Diploid Potato Breeding ◽  
Growing Conditions ◽  
Tuber Specific Gravity

A base population of high specific gravity clones was established from a diploid hybrid population of Solarium tuberosum Group Phureja and Solarium tuberosum Group Stenotomum previously adapted to the long-day growing conditions in North Carolina. This base population was subjected to two 2-year cycles of recurrent selection. During each cycle, selections in the field were made on the basis of tuber smoothness, shape, and size. Tubers from unselected clones were bulked by plots. Tuber specific gravity was determined for the selected and unselected (bulk) clones. Tuber specific gravity was significantly greater in the selected than in the unselected clones in each cycle of selection.

scholarly journals Genetic progress in maize from advanced cycles of reciprocal recurrent selection through REML/BLUP

2020 ◽  
pp. 1295-1301
Author(s):  
José Arantes Ferreira Júnior ◽  
Gabriel Moreno Bernardo Gonçalves ◽  
Jocarla Ambrosim Crevelari ◽  
Julio Cesar Fiorio Vettorazzi ◽  
Vivane Mirian Lanhellas Gonçalves ◽  
...  
Keyword(s):  
Grain Yield ◽  
Mixed Models ◽  
Variance Components ◽  
Genetic Parameters ◽  
Recurrent Selection ◽  
Yield Potential ◽  
Reciprocal Recurrent Selection ◽  
Genetic Progress ◽  
Advanced Cycles ◽  
Selection Of

Breeding methods such as reciprocal recurrent selection (RRS) is very important alternative to breeders. This strategy, besides allowing continuous genetic progress, helps maintaining the genetic variability of populations. The aim of the present study was to estimate genetic parameters, as well as to predict selection gains in advanced cycles of reciprocal recurrent selection of maize progenies through mixed models. Two selection cycles were considered. We evaluated 196 and 169 progenies in the 15 and 16 cycles, respectively. The yield potential of the progenies was evaluated from the following characteristics: grain yield, number of ears, weight of ears and weight of 100 seeds. The estimate of variance components and the prediction of genetic values were based on the REML/BLUP method. Overall, the genetic parameters were increased in the 16th cycle estimates compared to the previous cycle. It is worth highlighting that heritability coefficient for the grain yield was (0.81) in the 16th cycle, since it resulted in 21% of selection gain. Results showed that, even after sixteen recurrent selection cycles, the populations under selection have high potential for satisfactory genetic gains.

Heritability of Specific Gravity of Diploid Potato under High Temperature Growing Conditions

Crop Science ◽  
1989 ◽  
Vol 29 (3) ◽  
pp. 622-625 ◽  
Author(s):  
K. G. Haynes ◽  
F. L. Haynes ◽  
W. R. Henderson
Keyword(s):  
High Temperature ◽  
Specific Gravity ◽  
Diploid Potato ◽  
Growing Conditions

scholarly journals Estimates of genetic and phenotypic parameters in a segregant population of rice irrigated by continuous flooding

1997 ◽  
Vol 20 (3) ◽  
pp. 429-434
Author(s):  
Patrícia Guimarães Santos ◽  
Antônio Alves Soares ◽  
Magno A.P. Ramalho
Keyword(s):  
Experimental Design ◽  
Genetic Variability ◽  
Grain Yield ◽  
Variance Components ◽  
Recurrent Selection ◽  
Pyricularia Grisea ◽  
Realized Heritability ◽  
Average Yield ◽  
Neck Blast ◽  
Using Data

Estimates of genetic and phenotypic parameters were obtained by using data from families of a recurrent selection program in rice. An experiment using population CNA-IRAT 4ME/1/1 was conducted at two locations (Lambari and Cambuquira) in the State of Minas Gerais, Brazil. At Lambari, families S0:2 and S0:3 were assessed during crop seasons 1992/1993 and 1993/1994, respectively. In the Cambuquira trial, only S0:3 families were tested in 1993/1994. The experimental design was a 10 x 10 lattice with three replications. The following traits were assessed: grain yield (GY), mean number of days to flowering (FL), plant height (PH), and the incidence of neck blast (NB) caused by Pyricularia grisea and grain staining (GS) caused by Drechslera oryzae. This population proved to be promising for recurrent selection, as it had high average yield and genetic variability. Heritability estimates obtained using variance components were generally greater than estimates of realized heritability, and heritability obtained by parent-offspring regression

GENETIC VARIANCE COMPONENTS IN CULTIVATED STRAWBERRY

1970 ◽  
Vol 12 (1) ◽  
pp. 52-59 ◽  
Author(s):  
R. Watkins ◽  
L. P. S. Spangelo ◽  
A. T. Bolton
Keyword(s):  
Variance Components ◽  
Large Scale ◽  
Genetic Variance ◽  
Recurrent Selection ◽  
Small Scale ◽  
Relative Importance ◽  
Reciprocal Recurrent Selection ◽  
Genetic Progress ◽  
Total Genetic Variance ◽  
Large Scale Testing

Two methods of determining the relative importance of the additive, dominance and epistatic components of genetic variance indicated that the nonadditive variance (most of which was shown to be epistatic) constituted approximately 50% of the total genetic variance for 20 commercial characteristics of the cultivated strawberry. With nonadditive, particularly epistatic, variance being so important, genetic progress may best be achieved by a two-step breeding procedure involving small scale testing of all the progenies followed by large scale testing of the best progenies. Breeding procedures involving such methods as reciprocal recurrent selection, inbreeding and backcrossing would be more efficient as a means of generating special types of parents for such a program than they would be as isolated breeding procedures.

scholarly journals ESTIMATES OF GENETIC PARAMETERS USING RELM/BLUP FOR INTRA-POPULATIONAL GENETIC BREEDING OF Platonia insignis Mart.

2016 ◽  
Vol 40 (3) ◽  
pp. 561-573 ◽  
Author(s):  
Maria Clideana Cabral Maia ◽  
Luciano Medina Macedo ◽  
Lúcio Flavo Lopes Vasconcelos ◽  
João Pedro Alves Aquino ◽  
Luís Cláudio Oliveira ◽  
...  
Keyword(s):  
Variance Components ◽  
Genetic Parameters ◽  
Recurrent Selection ◽  
Indirect Selection ◽  
Best Linear Unbiased Prediction ◽  
Selection Differential ◽  
Linear Unbiased Prediction ◽  
Genetic Breeding ◽  
Best Linear Unbiased ◽  
Selection Of

ABSTRACT The aim of this study was to estimate genetic parameters to support the selection of bacuri progenies for a first cycle of recurrent selection, using the REML/BLUP (restricted maximum likelihood/best linear unbiased prediction) procedure to estimate the variance components and genotypic values. Were evaluated twelve variables in a total of 210 fruits from 39 different seed trees, from a field trial with an experimental design of incomplete blocks with clonal replies among subplots. The three variables related with the fruit development (weight, diameter, length) showed strong correlation, and where fruit length showed higher heritability and potential to be used for indirect selection. Among the 39 progenies evaluated in this study, five present potential to compose the next cycle of recurrent selection, due they hold good selection differential either to agrotechnological variables as to development of bacuri fruit.

Developing self-compatible diploid potato germplasm through recurrent selection

Euphytica ◽  
2021 ◽  
Vol 217 (3) ◽  
Author(s):  
Maher Alsahlany ◽  
Felix Enciso-Rodriguez ◽  
Marco Lopez-Cruz ◽  
Joseph Coombs ◽  
David S. Douches
Keyword(s):  
Recurrent Selection ◽  
Diploid Potato ◽  
Potato Germplasm

Quantitative genetic analysis of in vitro callus proliferation in alfalfa

1997 ◽  
Vol 77 (2) ◽  
pp. 225-229 ◽  
Author(s):  
G. A. Kielly ◽  
S. R. Bowley
Keyword(s):  
Medicago Sativa ◽  
Combining Ability ◽  
Variance Components ◽  
Recurrent Selection ◽  
Experimental Population ◽  
Reciprocal Effects ◽  
Callus Production ◽  
Callus Proliferation ◽  
Medicago Sativa L

Genetic variability exists for in vitro callus growth within plant species, including alfalfa (Medicago sativa L.). The objective of this study was to investigate, using diallel crosses, the genetic variance components of in vitro callus production in tetraploid alfalfa. Nine genotypes were randomly chosen from among 60 plants from the cultivar Saranac and the experimental population OAC81-120R, which were previously characterized as being able to initiate callus. The group of nine plants was divided and crossed to generate two, six-plant diallel sets (A and B) with reciprocals; and the progeny were evaluated for callus production. Significant (P < 0.01) differences were found among crosses and for general combining ability (GCA) effects in both diallels. Specific combining ability (SCA) and reciprocal effects were found to be nonsignificant (P < 0.05). Estimates of heritability (h2) for callus production on a plot mean basis were 73% and 61% for diallel A and B, respectively. Since the heritabilities were high, and no reciprocal effects were detected, breeding strategies employing recurrent selection should result in the development of high in vitro callus producing populations. Key words: Medicago sativa L., callus proliferation, tissue culture, quantitative genetics, heritability, alfalfa

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