scholarly journals ESTIMATION GENE EFFECTS BASED ON JOINT SCALING TEST AND SOME GENETIC PARAMETERS IN FOUR MAIZE CROSSES 1-YIELD COMPONENTS

2019 ◽  
Vol 49 (2) ◽  
Author(s):  
B. H. Hadi
Keyword(s):  
Genetic Parameters ◽  
Genetic Variance ◽  
Block Design ◽  
Dominance Model ◽  
Chi Square ◽  
Gene Effects ◽  
Randomized Complete Block Design ◽  
Maize Grain ◽  
Allelic Interaction

The objective of this study to estimate the components of genetic variation, phenotypic (PCV) ,genotypic(GCV)  coefficient of variation, genetic gain and its percentage. An experiment was conducted at the field of Field Crop Dept.Coll. Agric.-Univ. Baghdad, using four crosses (FI01301 Rustico), (AntignaoHi39× Nostred), (Lo1391× Rustico) and (Rusticocangini× Rustico) which developed  from crossing of genetically different of six inbred lines for maize (Zae mays L.), introduced from Italy. Genetic parameters were estimated according to the Joint scaling test using the randomized complete block design with four replications. The components  of genetic variance; Additive and dominance of the maize grain yield and some trait, were estimated. The results showed that the values of Chi square were significant  for all the studied some traits  of all crosses, thus the simple additive – dominance model in four crosses exhibited lack of good fit  for all traits, indicates the role of non-allelic interaction. Dominance gene action was higher than additive for most traits. Therefore the hybridization would be more effective than population selection to improve these traits for these crosses.

scholarly journals Genetic parameters of resistance to Meloidogyne incognita in melon

2017 ◽  
Vol 47 (5) ◽  
Author(s):  
Willame dos Santos Candido ◽  
Renata Castoldi ◽  
Lucas da Silva Santos ◽  
Dora Enith Tobar-Tosse ◽  
Pedro Luiz Martins Soares ◽  
...  
Keyword(s):  
Meloidogyne Incognita ◽  
Genetic Parameters ◽  
Block Design ◽  
Root Knot Nematode ◽  
Chi Square ◽  
Nematode Reproduction ◽  
Randomized Complete Block Design ◽  
Chi Square Test ◽  
Reproduction Factor ◽  
Six Genes

ABSTRACT: In order to assess the genetic control of resistance in the melon ‘Gaúcho Redondo’ to the root-knot nematode Meloidogyne incognita, an experiment was conducted in a randomized complete block design with three blocks and six treatments using the parental lines ‘Gaúcho Redondo’ (P1 resistant) and JAB 20 (P2 susceptible), as well as F1, F2, and backcross generations (RC1P1 and RC1P2). Seventy days after inoculation, individual plants were evaluated for resistance using the nematode reproduction factor (RF). The hypothesis of monogenic inheritance was rejected by the chi-square test (χ2), and results indicated that resistance is controlled by more than one gene locus, as confirmed by the quantitative analysis that revealed the presence of six genes.

Estimating genetic gains from alternative breeding strategies for clonal forestry

1992 ◽  
Vol 22 (1) ◽  
pp. 14-23 ◽  
Author(s):  
T.J. Mullin ◽  
Y.S. Park
Keyword(s):  
Linear Model ◽  
Genetic Parameters ◽  
Genetic Variance ◽  
Genetic Model ◽  
Large Fraction ◽  
Breeding Strategies ◽  
Clonal Forestry ◽  
Components Of Variance ◽  
Gene Effects ◽  
Dominance Variance

Concepts and procedures are presented for the analysis of progeny trials that incorporate clonal replication as a means to resolve variance arising from nonadditive gene effects. Components of variance from the linear model may be expressed in terms of expected covariances among relatives, and these, in turn, may be used to derive approximations of additive, dominance, and epistatic components of genetic variance. In addition to the usual assumptions applied to conventional progeny trials, the use of this expanded genetic model in the analysis of tests with clonal replicates assumes that the greatest portion of the total epistasis is due to interactions involving groups of more than two or three loci. If this assumption is not satisfied, estimates of additive and dominance variance, including those from trials without clonal replicates, will be contaminated by a large fraction of epistasis, and total epistasis will be underestimated by a corresponding amount. Heritability and gain formulae for alternative selection and deployment schemes are developed and illustrate the use of genetic parameters in the comparison of seedling and clonal reforestation strategies.

scholarly journals Estimación de varianzas genéticas en ocho variedades criollas de maíz para el Bajío mexicano.

2017 ◽  
Vol 28 (2) ◽  
pp. 455
Author(s):  
Luis Ángel Muñoz Romero ◽  
Enrique Navarro Guerrero ◽  
Manuel De la Rosa Ibarra ◽  
Luis Pérez Romero ◽  
Ángel Enrique Caamal Dzul
Keyword(s):  
Grain Yield ◽  
Genetic Variance ◽  
San Antonio ◽  
Block Design ◽  
Research Work ◽  
Experimental Plot ◽  
Additive Variance ◽  
Dominance Variance ◽  
Randomized Complete Block Design

The aim of this work was to estimate the combinatory aptitude, genetic variance and heterosis of eight creole corn varieties. The research work was carried in Irapuato, Guanajuato, México, during 2008 and 2009. A randomized complete block design with three replications was used to evaluate the twenty-eight crosses under method 4 Griffing (1956). Each experimental plot included four rows five meters long with a separation of 0,75 m. The general combing ability and specific (ACG and ACE) were highly significant (P<0.01) for all traits except flowering days. The dominance variance (σ2D) was larger and more important than additive variance (σ2A) for most of the traits, indicating that non- additive genetic genes were important on the expression of those traits on crosses. It was observed that varieties P6 (creole #5), P7 (creole #2) and P8 (creole San Antonio) had larger variance effects (σ2ACE) for long cob, number of rows per cob, total cob number, and grain yield. Some outstanding crosses were identified for their high grain yield as well as heterosis, mainly those that included germoplasm of creole #5, #2 and San Antonio. According to the aforementioned we recommend to draw lines from the above populations and cross them to produce hybrids. 

scholarly journals Selection of corn cultivars for yield, stability, and adaptability in the state of Amazonas, Brazil

2017 ◽  
Vol 52 (6) ◽  
pp. 455-463 ◽  
Author(s):  
Inocencio Junior de Oliveira ◽  
André Luiz Atroch ◽  
Miguel Costa Dias ◽  
Lauro José Guimarães ◽  
Paulo Evaristo de Oliveira Guimarães
Keyword(s):  
Grain Yield ◽  
Genetic Parameters ◽  
Block Design ◽  
The State ◽  
Environment Interaction ◽  
Growing Seasons ◽  
Randomized Complete Block Design ◽  
Selection For ◽  
Genetic Value ◽  
Selection Of

Abstract: The objective of this work was to evaluate corn cultivars grown in the state of Amazonas, Brazil, which simultaneously show high grain yield, adaptability, and stability. The trials were carried out in seven environments in the state of Amazonas, in a randomized complete block design, with two replicates. The grain yield of 30 corn cultivars was evaluated in four growing seasons, from 2011/2012 to 2014/2015. The genetic parameters were estimated by the REML/Blup methodology. The selection for adaptability and stability was based on the predicted genetic value and on the harmonic mean of the relative performance of the genetic values. Despite the existence of genotype x environment interaction, cultivars with high adaptability and stability were identified. Iranduba - lowland, in 2011/2012 and 2014/2015 - and Rio Preto da Eva - upland, in 2012/2013 - stood out as favorable environments, while Iranduba - upland, in 2011/2012 and 2012/2013 - and Manaus - upland, in 2012/2013 and 2013/2014 - were classified as unfavorable environments. The single-cross hybrid BRS 1055 showed productive superiority and high stability in this region. The Sint 10771, Sint 10781, and Sint 10699 synthetic varieties showed high adaptability. BRS Caimbé shows specific adaptability to cropping in upland environments of the state of Amazonas, Brazil.

scholarly journals Diallel Analysis of Quality and Yield Contributing Traits of Pumpkin (Cucurbita moschata Duch. ex Poir.)

2016 ◽  
Vol 14 (1) ◽  
pp. 15-32 ◽  
Author(s):  
M S Rana ◽  
M G Rasu ◽  
A K M A Islam ◽  
M M Hossain
Keyword(s):  
Dry Matter ◽  
Block Design ◽  
Diallel Analysis ◽  
Reducing Sugar ◽  
F1 Hybrids ◽  
Graph Analysis ◽  
Cucurbita Moschata ◽  
Randomized Complete Block Design ◽  
Allelic Interaction ◽  
Positive Effect

A 5 X 5 diallel analysis was carried out according to Hayman on quality and yield contributing traits of pumpkin. Five (5) advanced inbreds of pumpkin viz IB 23, IB 40, IB 47, IB 50 and IB 57 were used in this study. The five parents and their F1 hybrids were arranged in a randomized complete block design with three replications for studying the quality and yield contributing traits. Analysis of variance showed significant differences among genotypes for all of the traits except dry matter and fruit yield. Parental mean suggested that all the parents contained recessive alleles with positive effect. In the 5 × 5 diallel set, Wr-Vr graph analysis revealed the presence of allelic interaction in all the character’s except fruit length, dry matter, brix percentage and reducing sugar where non-allelic interaction was present.The Agriculturists 2016; 14(1) 15-32

scholarly journals Effect of Intercropping Dates of Lablab (Lablab purpureus L.) with Maize (Zea mays L.) on Forage and Maize Grain Yields

2020 ◽  
pp. 1-4
Author(s):  
Meseret Redae ◽  
Desta Tekle
Keyword(s):  
Zea Mays ◽  
Dry Matter ◽  
Zea Mays L ◽  
Block Design ◽  
Forage Yield ◽  
Lablab Purpureus ◽  
Grain Yields ◽  
Maize Grain Yield ◽  
Randomized Complete Block Design ◽  
Maize Grain

This study was conducted to evaluate effect of intercropping dates of lablab (Lablab purpureus L.) with maize (Zea mays L.) on forage and maize grain yields. It was carried out at Gereb Giba in Tanqua Abergelle district, Tigray, Ethiopia. Randomized Complete Block Design (RCBD) with four treatments and four replications were used. The treatments were sole maize sown (T1) and lablab sown at 10, 20 and 30 days after emergence of maize for T2, T3 and T4 respectively. Intercropping did not affect height and days for 50% flowering of lablab. Similarly, it was not affected height and days for physiological maturity of maize. Lablab forage yield was significantly greater (p<0.01) in T2 and T3 than T4. Maize Stover dry matter (DM) yield was similar among treatments while total forage DM yield was significantly higher (p<0.0001) in T2, T3 and T4 than T1. Moreover, among the intercrops, total forage yield was significantly highest (p<0.0001) for T2 compared to T4 but similar in T2 and T3. Maize grain yield was significantly superior (P<0.0001) in T2 and T3 compared to T1 and T4. Though, T2 and T3 had similarity in all parameters measured, T2 provided higher forage and maize grain yields than T1 and T4. Therefore, lablab intercropping at 10 days after emergence of maize is appropriate in Tanqua Abergelle district and other areas with similar agro ecologies.

scholarly journals THE ROLE OF BIO, ORGANIC AND CHEMICAL FERTILIZERS IN THE GROWTH OF BUDDED APRICOT SEEDLINGS CV. "ZAGHINIA"

2020 ◽  
Keyword(s):  
Seedling Growth ◽  
Block Design ◽  
Organic Fertilizer ◽  
Factorial Experiment ◽  
Chemical Fertilizers ◽  
College Of Agriculture ◽  
Randomized Complete Block Design ◽  
Multiple Levels ◽  
Double Interaction

The study was conducted in the nursery of Hort. Dept., College of Agriculture and Forestry, Mosul University, Iraq, during 2018 season to study the response of budded "Zaghinia" apricot on seedlings rootstock to bio, organic and chemical fertilizers, and their effects on seedling growth. The studied factors were as follows: Bio fertilizer Fulzyme (0, 1 and 2 g.seedling-1 ), Organic fertilizer (rice residue) (0, 1 and 2 kg.seedling-1 ) and DAP fertilizers (0, 5 and 10 gm.seedling-1 ). The study was performed by using split-split plots within factorial experiment in Randomized Complete Block Design (RCBD), with 3 factors and 3 replicates, by using 6 seedlings for each treatment. Treatment means were compared by using Duncan multiple levels at 5% p. The most important results obtained were as follows: 1 and 2 g.seedling-1 of bio fertilizer (Fulzyme) resulted in a significant increase in most of traits, especially leaves content of P and Zn, while the addition of organic fertilizer (rice residue) at 1 and 2 kg.seedling-1 gave a significant increase in most of studied traits (leaves N, P, K and Zn, Chemical fertilizer (DAP) at the levels 5 and 10 g.seedling-1 affected significantly most of the studied traits, especially leaves K and Zn. The double interaction has a high role in seedlings growth, especially the interaction between bio fertilizer (Fulzyme) and organic fertilizer (rice residue), which affected highly in leaves N, P & Zn and the triple interference also gave a significant increase in all studied traits.

scholarly journals Role of Azolla Pinnata Biofertilizer Extract in Producing Healthy Tomatoes

2018 ◽  
pp. 1-8
Author(s):  
Ashraf Hanafy ◽  
Gehan, A. E. El-Emary
Keyword(s):  
Vegetative Growth ◽  
Block Design ◽  
Summer Season ◽  
Control Group ◽  
Significant Difference ◽  
Randomized Complete Block Design ◽  
Local Store ◽  
And Control ◽  
Seed Germination Test

Well-known commercial Tomato seeds (Alisa) were obtained from a famous local store. All seeds were grouped into 7 groups (5%, 10%, 20%, 30%, 40%, 50%, and Control), which were equivalent to different Azolla biofertilizers extract. Seeds of each group were left immersed in the equivalent concentration 24 hours before sown in pots with growing media of 1 peat: 1Vermeculite at the beginning of summer season (First week of May). At the time of transplantation to the field, three pots of each group were used for seed germination test; Seeds were transplanted into the field after 6 weeks. After three days of transplantation, control solution (without Azolla biofertilizer) and different Azolla biofertilizers were foliar applied, the process was repeated every 15 days till 45 days after transplanting. Randomized Complete Block Design with three replicates was adapted. Each block consisted of two rows of 1.5m in wide and 5 m long (15 m2/plot), plant spacing was 50 cm, and each replicate has 20 plants. The suggested development approaches for the summer season were conducted all through the developing season. Vegetative growth of the tomatoes was expressed as plant height, plant length, branch flower clusters, and fruits were estimated in five plants/plot after 50 days from the date of transplanting. Tomatoes of control group and Tomatoes that showed a strong vegetative growth were used for feeding Winstar rats. All Biochemical parameters showed a highly significant difference compared to the control group.

scholarly journals Morphological characterization and assessment of genetic parameters of NERICA mutant rice lines under rainfed condition

2017 ◽  
Vol 2 (4) ◽  
pp. 532-540
Author(s):  
Md Nuruzzaman ◽  
Lutful Hassan ◽  
Shamsun Nahar Begum ◽  
Md Monjurul Huda
Keyword(s):  
Genetic Parameters ◽  
Block Design ◽  
Maximum Yield ◽  
Morphological Characters ◽  
Morphological Characterization ◽  
Rainfed Condition ◽  
Randomized Complete Block Design ◽  
High Heritability ◽  
Parental Lines ◽  
Mutant Lines

An experiment was conducted to evaluate thirty one NERICA mutant rice genotypes (twenty eight NERICA mutant lines along with three parental lines) of advanced (M4 and M5)generations for morphological characters and genetic parameters assessment in aus season, 2014 at the experimental field of Biotechnology division, BINA, BAU Campus, Mymensingh-2202 following Randomized Complete Block Design (RCBD) with three replications. The genotypes differed significantly for all the traits viz., days to flowering (1st, 50%, 80%), days to maturity, plant height, total tillers and effective tillers hill-1, filled and unfilled grains panicle-1, 100-seed weight (g) and yield plant-1(g).N1/300/P-9-5 had maximum yield plant-1 and N4 parent had minimum yield plant-1. All the parental lines showed less yield compared to other mutant lines. The phenotypic coefficient of variations (PCV) were higher than genotypic co-efficient of variations (GCV) for all the traits studied indicating that they all interacted with the environment to some extent. All the traits studied expressed moderate to high heritability estimates ranging from 43.68 to 92.87%. High heritability along with high genetic advance was noticed for the traits, number of filled grains panicle-1, number of unfilled grains panicle-1 and plant height.Asian J. Med. Biol. Res. December 2016, 2(4): 532-540

scholarly journals Plant stand failures effect in genetic parameters estimation procedure in Eucalyptus sp.

2020 ◽  
Vol 8 (3) ◽  
pp. 264-276
Author(s):  
Yanca Araujo Frias ◽  
Osmar Gabriel Trigo Marques de Oliveira ◽  
João Victor Tino Dellaqua ◽  
Evandro Pereira Prado ◽  
Paulo Renato Matos Lopes ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Block Design ◽  
Estimation Procedure ◽  
Parameters Estimation ◽  
Forest Genetics ◽  
Breast Height ◽  
Randomized Complete Block Design ◽  
Sib Families ◽  
Plant Stand ◽  
Selective Process

The objective of this work was to verify the influence of the percentage of failures in a forest genetics experiment in the estimation of genetic parameters. The study consisted in the evaluation of two experiments of full‑sib families under randomized complete block design with three replicates conducted in the state of Minas Gerais, Brazil. The experiment I was evaluated in January 2002, with approximately 60 months of age. The experiment II was evaluated in January 2003, with 45 months of age. In both experiments, the evaluations consisted of the measurement of the diameter at breast height and plant height. For all the investigated genetic parameters, an increase in the amplitude of the estimates was verified due to the increase in the number of experimental failures. Variances and negative heritabilities were detected, from 35% of failure, indicating that in such cases, this proportion of failure may be problematic to estimate genetic values, to estimate the gain with the selective process and for make decision.

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