Analysis of genetic effects on a complete diallel cross test of Pinus koraiensis

The objective of our study was to characterize and determine the patterns of genetic control in relation to tolerance and efficiency of nitrogen use by means of a complete diallel cross involving contrasting inbred progenies of tropical maize based on a univariate approach within the perspective of a multivariate mixed model. Eleven progenies, previously classified regarding the tolerance and responsiveness to nitrogen, were crossed in a complete diallel cross. Fifty-five hybrids were obtained. The hybrids and the progenies were evaluated at two different nitrogen levels, in two locations. The grain yield was measured as well as its yield components. The heritability values between the higher and lower nitrogen input environment did not differ among themselves. It was observed that the general combining ability values were similar for both approaches univariate and multivariate, when it was analyzed within each location and nitrogen level. The estimate of variance of the specific combining ability was higher than general combining ability estimate and the ratio between them was 0.54. The univariate and multivariate approaches are equivalent in experiments with good precision and high heritability. The nonadditive genetic effects exhibit greater quantities than the additive genetic effects for the genetic control of nitrogen use efficiency.

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CHARACTERISTICS OF TOBACCO FROM CROSSES BETWEEN BURLEY AND FLUE-CURED CULTIVARS

Canadian Journal of Genetics and Cytology ◽

10.1139/g71-032 ◽

1971 ◽

Vol 13 (2) ◽

pp. 179-185 ◽

Cited By ~ 1

Author(s):

Bronius Povilaitis

Keyword(s):

Combining Ability ◽

Reducing Sugars ◽

Sugar Content ◽

Diallel Cross ◽

Subjective Rating ◽

Body Color ◽

Total Alkaloids ◽

Complete Diallel Cross ◽

The Mean ◽

Cross Test

Four burley and four flue-cured tobacco cultivars were selfed and crossed in all possible combinations to produce seed for a complete diallel cross test which was grown in 1965. Burley parents and burley × burley entries were omitted from the test in 1967 and only selected burley × flue crosses and their flue-cured parent were grown in 1968.Mean squares for the general combining ability were significant for yield, lamina weight, filling value, total alkaloids and reducing sugars, and non-significant for total nitrogen content. The mean squares for specific combining ability were significant for all six characters, suggesting that in the inheritance of these characters, additivity and dominance are both important. Heterosis effects for yield, lamina weight and reducing sugars were significant, but non-significant for days to flower and total alkaloids. The burley × flue hybrids gave considerably higher yields than their flue-cured parental cultivars. Lamina weight and the reducing sugar content of the hybrids was lower than the flue-cured tobacco cultivars. The subjective rating of the hybrids for body, color and texture of the cured leaf gave lower values than those assigned to the flue-cured parents.

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Genetic effects on seed quality in diallel crosses of popcorn

Ciência e Agrotecnologia ◽

10.1590/s1413-70542013000600003 ◽

2013 ◽

Vol 37 (6) ◽

pp. 502-511 ◽

Cited By ~ 5

Author(s):

Pablo Diego Silva Cabral ◽

Antonio Teixeira do Amaral Júnior ◽

Henrique Duarte Vieira ◽

Juliana Saltires Santos ◽

Ismael Lourenço de Jesus Freitas ◽

...

Keyword(s):

Combining Ability ◽

Seed Quality ◽

Crop Yields ◽

Female Parent ◽

Diallel Cross ◽

Genetic Effects ◽

Reciprocal Effects ◽

Strongly Correlated ◽

Complete Diallel Cross ◽

The Ideal

The failure to obtain the ideal stand is one of the causes of decreased crop yields, in this sense it is important to investigate the genetic effects related to seed quality. The aim of this study was to measure the general combining ability (GCA), the specific combining ability (SCA) and the reciprocal effects (RE) for popcorn seed quality in addition to evaluate the association between germination and vigor tests with field emergencein order to identify hybrids with better germination and vigour. Ten inbred lines were evaluated using a complete diallel cross with reciprocals. Seed quality was measured by germination tests (GT) and by modified cold vigour tests (MCV). In the GT, the numbers of strong normal seedlings (SNS), weak normal (WNS), abnormal (AS) and ungerminated seeds (UGS) were counted. In the MCV, the numbers of normal seedlings (NPC), abnormal (ASC) and ungerminated seeds (UGSC) were counted, and the plants' dry matter (DM) was measured. Analysis of variance for GCA, SCA and RE were significant for all variables. The quadratic components for SCA were higher than those for GCA for the SNS, AS, UGS, ASC and UGSC traits, which indicates higher significance for the non-additive effects. The most favourable GCA estimates, were found in lines P3 and L70. The best hybrids were P1xL70, P3xP6 and P8xL70. The RE results showed that L70 and P3 should be used as the female parent in the P1xL70 and P3xP6 hybrid crosses, respectively. The MCV was the test that was most strongly correlated with field emergence, with a magnitude of 0.667.

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Establishment and genetic analysis of complete diallel cross families of pearl oyster (Pinctada fucata)

JOURNAL OF FISHERIES OF CHINA ◽

10.3724/sp.j.1231.2010.06498 ◽

2010 ◽

Vol 34 (1) ◽

pp. 26-31

Author(s):

Long-chun GU ◽

Jin-bi LI ◽

Da-hui YU ◽

Gui-ju HUANG ◽

Jian-ye LIU

Keyword(s):

Genetic Analysis ◽

Diallel Cross ◽

Pearl Oyster ◽

Pinctada Fucata ◽

Complete Diallel Cross

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Improvement of methods of creating hybrids of cabbage

VEGETABLE CROPS OF RUSSIA ◽

10.18619/2072-9146-2019-4-3-7 ◽

2019 ◽

pp. 3-7 ◽

Cited By ~ 1

Author(s):

Anna I. Mineykina ◽

Lyudmila L. Bondareva ◽

Darya V. Shumilina ◽

Elena A. Domblides ◽

Alexey V. Soldatenko

Keyword(s):

First Generation ◽

Microspore Culture ◽

Diallel Cross ◽

High Yield ◽

Isolated Microspores ◽

Economically Valuable Traits ◽

Complete Diallel Cross ◽

Speed Up ◽

Pure Lines

Relevance One of the basic directions of the cabbage crop breeding is the creation of F1 hybrids with a complex of economically valuable traits. This process is difficult and time-consuming as to get pure lines must be within 6-12 years hold inbreeding. Herewith not every line gives the desired heterotic effect that also requires additional verification. Methods Biotechnological method culture of isolated microspores in vitro, which allows in the first generation to receive a line with 100% homozygosity, was used to speed up the breeding process. Combination ability were performed in complete diallel cross on the basic morphological signs. Results Culture medium for cultivation of isolated microspores in vitro was optimized for each genotype of cabbage for the best embryoids regeneration. Maximum amount of embryoids was received on medium with pH 6.2 using ampicillin 100 mg/l and zeatin 1 mg/l: 466.7 ± 153.2 PCs/100 buds. A new source material for breeding – doubled haploid lines of cabbage was received. Lines – the best parents for F1 hybrids with high yield, compact rosette of leaves, with optimum inside and short outside cabbage stump was created. Studies have shown that optimization of breeding process in case of creation of pure lines of cabbage in 3 years with microspore culture requires to reduce the breeding process in 2 times.

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DIALLEL ANALYSIS OF TOLERANCE TO DROUGHT IN COWPEA GENOTYPES

Revista Caatinga ◽

10.1590/1983-21252018v31n105rc ◽

2018 ◽

Vol 31 (1) ◽

pp. 40-47 ◽

Cited By ~ 2

Author(s):

ERINA VITÓRIO RODRIGUES ◽

KAESEL JACKSON DAMASCENO-SILVA ◽

MAURISRAEL DE MOURA ROCHA ◽

EDSON ALVES BASTOS ◽

ADRIANO DOS SANTOS

Keyword(s):

Water Deficit ◽

Recurrent Selection ◽

Diallel Analysis ◽

Diallel Cross ◽

Limiting Factors ◽

Additive Effects ◽

Negative Effects ◽

Complete Diallel Cross ◽

Brazilian Northeast ◽

Block Experiment

ABSTRACT The low use of technologies by farmers and the occurrence of biotic and abiotic stresses are limiting factors for cowpea production in the Brazilian Northeast region. The tolerance of genotypes to drought is an alternative to decrease the negative effects of stresses on cowpea production. Thus, the objective of this work was to identify parents and combinations of cowpea genotypes with high probability of generating segregating populations with tolerance to drought. Six cowpea genotypes were crossed in a complete diallel cross design, totaling 30 F2 populations, which were evaluated together with their parents in an experiment under water deficit at the experimental field of the Embrapa Mid-North, Teresina, State of Piauí, Brazil. A triple lattice incomplete block experiment design was used, with three replications, with experimental plot consisting of six 2-m plant rows. Fifteen plants per plot were sampled to evaluate their agronomic characteristics, whose results were subjected to analysis of variance and means were used to estimate the general and specific combining abilities. The genotypes showed significant differences in all characteristics evaluated, denoting the genetic variability of the population. The additive effects were more important than the non-additive effects, and maternal inheritance was detected. The genotypes BRS Xiquexique, Pingo-de-Ouro-1-2 and MNC99-510F-16-1 were the most promising for use in recurrent selection programs for tolerance to water deficit. The hybrid combinations (1) BRS Paraguaçu X (4) CNCx-698-128G, (2) Pingo-de-Ouro-1-2 X (3) BRS Xiquexique, (3) BRS Xiquexique X (5) Santo-Inácio, (4) CNCx-698-128G X (6) MNC99-510F-16-1 and (5) Santo-Inácio X (4) CNCx-698-128G showed potential for generating superior lineages regarding bean production and tolerance to water deficit.

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