Effects of Migration on Genetic Variability and Parent–Offspring Correlation Coefficients in Anthropometric and Physiometric Phenotypes Among Three Groups of Population in Punjab, India

2007 ◽  
Vol 21 (3-4) ◽  
pp. 275-283
Author(s):  
Badarud Doza ◽  
Sandeep Kaur Brar
Keyword(s):  
Genetic Variability ◽  
Correlation Coefficients

scholarly journals Genetic variability of rye-xenic-hybrid traits

2014 ◽  
Vol 65 (3-4) ◽  
pp. 329-333 ◽  
Author(s):  
Lechosław Grochowski ◽  
Jan Kaczmarek ◽  
Władysław Kadłubiec ◽  
Henryk Bujak
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Plant Height ◽  
Combining Ability ◽  
Field Experiments ◽  
Correlation Coefficients ◽  
Winter Rye ◽  
Arithmetic Means ◽  
Coefficients Of Variation ◽  
Standard Cultivar

In field experiments performed in two localities (Smolice, Wrocław) 18 xenic hybrids of winter rye, two testers and standard cultivar Dańkowskie Złote, were analysed. The objects of detailed evaluations were 11 traits. For six of them arithmetic means (x), standard deviations (S), coefficients of variation (cv), coefficients of genetic diversity (h<sup>2</sup>), correlation coefficients were calculated. Moreover, analyses of variance were carried out and the effects of general (GCA) and specific (SCA) combining ability were estimated. The existence of quantitative xenia in hybrids was confirmed. It was shown that xenic hybrids, in respect to most of the analysed traits, were insignificantly inferior to the testers and the standard cultivar. However, the decrease of plant height has shown to be significant and a tendency to higher yield was observed.

scholarly journals Genetic variability of productivity traits and evaluation of exterior of Holstein cows depending on body type

2021 ◽  
Vol 212 (09) ◽  
pp. 53-62
Author(s):  
A. Konte ◽  
Galina Karlikova
Keyword(s):  
Genetic Variability ◽  
Milk Yield ◽  
Mass Fraction ◽  
Mixed Model ◽  
Correlation Coefficients ◽  
Holstein Cows ◽  
Body Type ◽  
Body Depth ◽  
Protein Mass ◽  
Productivity Indicators

Abstract. The aim of the research is to study the selection and genetic parameters of the characteristics of productivity and the exterior of Holstein first-calf cows, depending on their body type. Research methods. Based on the data from the SELEX database, we researched the performance indicators and measurements of the trunk of first calving cows in the amount of 4049 heads. Based on the RENUMF90 software shell of the BLUPF90 program, we obtained digital values of the genetic variability of productivity indicators and the external structure of animals in accordance with the equation of the mixed model. Results. The most broad-bodied animals classified as airysomal type had the highest milk yield in the first lactation, and exceeded animals of the leptosomal type by 563.3 kg (p ≤ 0.001). According to the "B" system, broad-bodied cows are superior to narrow-bodied animals: stature – by 1 point (p ≤ 0.001); body depth – by 0.8 points (p ≤ 0.01); rump width – by 1.9 points (p ≤ 0.001); rump angle – by 0.9 points (p ≤ 0.01); fore udder attachment – by 1 point (p ≤ 0.01). Animals of the narrow-bodied type reliably (p ≤ 0.001) had a high genetic relationship between milk yield in 305 days of first lactation and the mass fraction of protein in milk (0.59 ± 0.005). At the same time, the leptosomal type of cows also had the greatest correlation between milk yield and mass fraction of fat (0.51 ± 0.005) (p ≤ 0.001). According to body measurements, the highest correlation coefficients were found in animals of the airysomal type – 0.24 ... 0.50. All Holstein heifers of different body types have high heritability coefficients in terms of fat mass fraction (h2 = 0.37 ... 0.49) and protein mass fraction (h2 = 0.42 ... 0.51). Scientific novelty. For the first time, studies of the genetic variability of productivity indicators and the exterior of Holstein cows, depending on their body type, were conducted.

Genetic variability and correlation studies in ‘egusi’ melon [ Citrullus lanatus (Thunb.) Matsum. & Nakai]

2008 ◽  
Vol 56 (2) ◽  
pp. 213-221 ◽  
Author(s):  
O. Kehinde ◽  
E. Idehen
Keyword(s):  
Genetic Variability ◽  
Seed Yield ◽  
Citrullus Lanatus ◽  
Fruit Size ◽  
Correlation Coefficients ◽  
Fruit Weight ◽  
Phenotypic Correlation ◽  
Early Season ◽  
Late Season ◽  
Positive Direct

Genetic variability and correlation analysis were studied in 20 accessions of ‘egusi’ melon during two growing seasons. The genotypic correlation coefficients with seed yield were partitioned into direct and indirect effect causes. Heritability in the broad sense ranged from 17% for fruit circumference to 90% for days to germination and flowering in the early season, while in the late season, heritability ranged from 7% for seed weight per fruit to 88% for days to germination. High phenotypic and genotypic coefficients of variation were recorded for seed yield while days to maturity had the lowest in both seasons. Fruit circumference and fruit weight had significant genotypic and phenotypic correlation with seed yield in the early season, while number of branches per plant, vine length per plant, number of fruits per plant and fruit circumference per plant showed significant genotypic and phenotypic correlation with seed yield in the late season. Environmental correlation coefficients were significant between seed yield and vine length per plant, number of fruits per plant and fruit size per plant. Vine length per plant and fruit circumference per plant had the largest positive direct effect on seed yield. Knowledge of the relationship of these characters with seed yield will aid in the selection of genotypes that have high seed yield, which will also be specific to the two major seasons in the year.

scholarly journals Genetic Variability and Correlation Coefficients of Major Traits in Early Maturing Rice under Rainfed Lowland Environments of Nepal

2019 ◽  
Author(s):  
Dev Nidhi Tiwari ◽  
Santosh Raj Tripathi ◽  
Mahendra Prasad Tripathi ◽  
Narayan Khatri ◽  
Bishwas Raj Bastola
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Research Program ◽  
Coefficient Of Variation ◽  
Quantitative Traits ◽  
Correlation Coefficients ◽  
Grain Weight ◽  
Days To Heading ◽  
Days To Maturity ◽  
1000 Grain Weight

ABSTRACTGenetic variability is the fundamental requirement of any crop breeding program to develop superior cultivars. The objective of this study was to estimate the genetic variability and find out the correlation among the different quantitative traits of rainfed early lowland rice. The experiment was conducted consecutively two years during 2015 and 2016 in wet season across the four different locations in Regional Agricultural Research Station, Khajura, National Wheat Research Program, Bhairahawa, National Maize Research Program, Rampur and National Rice Research Program, Hardinath along the Terai region of Nepal representing sub-tropical agro-climate. Seven genotypes including Hardinath-1 as standard check variety were evaluated in the randomized complete block design with three replications. Various quantitative traits were measured to investigate the variability and correlation coefficients. All the genotypes and locations showed significant variations for all the traits considered. Genotypic coefficient of variation was lower than phenotypic coefficient of variation for all traits studied. The magnitudes of genotypic coefficient of variations were relatively higher for grain yield, 1000-grain weight and days to heading. The highest broad sense heritability of 94% was recorded in days to maturity and the lowest heritability of 16% was observed in plant height. Positive and highly significant correlations were found both in genotypic and phenotypic levels between days to heading and days to maturity (rg=0.9999**, rp=0.997**), days to heading and grain yield (rg =0.9999**, rp= 0.9276**), days to maturity and grain yield (rg =0.9796**, rp=0.9174**). However, negative and highly significant genetic correlation was observed between plant height and 1000 grain weight (rg = -0.9999**). Thus results indicated that days to heading, days to maturity, grain yield, 1000 grain weight demonstrated higher heritability and remarkable genetic advance could be considered for the most appropriate traits for improvement and selection of trait to achieve stable and high yielding early rice genotypes under rainfed environments.

scholarly journals Genetic Variability and Correlation Coefficients of Major Traits in Early Maturing Rice under Rainfed Lowland Environments of Nepal

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Dev Nidhi Tiwari ◽  
Santosh Raj Tripathi ◽  
Mahendra Prasad Tripathi ◽  
Narayan Khatri ◽  
Bishwas Raj Bastola
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Research Program ◽  
Coefficient Of Variation ◽  
Quantitative Traits ◽  
Correlation Coefficients ◽  
Grain Weight ◽  
Days To Heading ◽  
Days To Maturity ◽  
1000 Grain Weight

Genetic variability is the fundamental requirement of any crop breeding program to develop superior cultivars. The objective of this study was to estimate the genetic variability and find out the correlation among the different quantitative traits of rainfed early lowland rice. The experiment was conducted consecutively two years during 2015 and 2016 in wet season across the four different locations in Regional Agricultural Research Station, Khajura, National Wheat Research Program, Bhairahawa, National Maize Research Program, Rampur, and National Rice Research Program, Hardinath, along the Terai region of Nepal representing subtropical agroclimate. Seven genotypes including Hardinath-1 as standard check variety were evaluated in the randomized complete block design with three replications. Various quantitative traits were measured to investigate the variability and correlation coefficients. All the genotypes and locations showed significant variations for all the traits considered. Genotypic coefficient of variation was lower than phenotypic coefficient of variation for all traits studied. The magnitudes of genotypic coefficient of variations were relatively higher for grain yield, 1000-grain weight, and days to heading. The highest broad sense heritability of 94% was recorded in days to maturity and the lowest heritability of 16% was observed in plant height. Positive and highly significant correlations were found both in genotypic and phenotypic levels between days to heading and days to maturity (rg=0.9999 ⁎⁎, rp=0.997 ⁎⁎), days to heading and grain yield (rg =0.9999 ⁎⁎, rp= 0.9276 ⁎⁎), and days to maturity and grain yield (rg =0.9796 ⁎⁎, rp=0.9174 ⁎⁎). However, negative and highly significant genetic correlation was observed between plant height and 1000-grain weight (rg = -0.9999 ⁎⁎). Thus results indicated that days to heading, days to maturity, grain yield, 1000-grain weight demonstrating higher heritability and remarkable genetic advance could be considered the most appropriate traits for improvement and selection of trait to achieve stable and high yielding early rice genotypes under rainfed environments.

scholarly journals Genetic variability, correlated response and path analysis of yield and yield contributing traits of spring wheat

1970 ◽  
Vol 6 (2) ◽  
pp. 227-234 ◽  
Author(s):  
DAN Majumder ◽  
AKM Shamsuddin ◽  
MA Kabir ◽  
L Hassan
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Spring Wheat ◽  
Harvest Index ◽  
Correlation Coefficients ◽  
Grain Weight ◽  
Phenotypic Correlation ◽  
Correlated Response ◽  
Path Coefficient ◽  
Wheat Varieties

Twenty spring wheat varieties were studied to find out genetic variability and genetic association for grain yield and its component characters. Both genotypic and phenotypic variances were highly significant in all the traits with little higher phenotypic variations as usual. Similarly, the low differences between the phenotypic and genotypic coefficients of variations indicated low environmental influences on the expression of these characters. High heritability coupled with high genetic advance were obtained with plant height, grains per spike, 100-grain weight, harvest index and grain yield. Genotypic correlation coefficients were higher than the corresponding phenotypic correlation coefficients in most of the traits. Spikes per plant, grains per spike, spike length, 100-grain weight and harvest index were the most important characters which possessed positive association with grain yield. Path coefficient analysis revealed that among the different yield contributing characters spike per plant, grains per spike, 100-grain weight and harvest index influenced grain yield per plant directly. The direct effects of these characters on grain yield were positive and considerably high. Moreover, harvest index, days to maturity and spikes per plant had positive and higher indirect effect on grain yield through grains per spike. Thus selection for yield in spring wheat through these characters would be effective. Keywords: Variability; Selection indices; WheatDOI: 10.3329/jbau.v6i2.4815 J. Bangladesh Agril. Univ. 6(2): 227-234, 2008

scholarly journals Genetic variability and correlation analysis in hybrids of mulberry silkworm, Bombyx mori L. for egg characters

1970 ◽  
Vol 27 ◽  
pp. 13-16 ◽  
Author(s):  
Md Kamrul Ahsan ◽  
SM Rahman
Keyword(s):  
Genetic Variability ◽  
Bombyx Mori ◽  
Coefficient Of Variation ◽  
Correlation Coefficients ◽  
Egg Laying ◽  
Phenotypic Correlation ◽  
Additive Gene ◽  
High Heritability ◽  
Hatching Percentage ◽  
Mulberry Silkworm

The genotypic variability and correlation coefficients were studied in thirty five hybrid populations for five egg characters. Variations among genotypes were highly significant (P < 0.001). Phenotypic coefficient of variation was higher than genotypic coefficient of variation for all the characters. Of them unfertilized and dead egg percentage showed highest difference between genotypic and phenotypic coefficient of variation suggesting most influence of environment on these characters. Majority of the characters showed high heritability except hatching percentage. Furthermore total number of egg laying per female showed high genetic advance together with high heritability, which indicates the importance of additive gene effect of this character. The genotypic correlations were higher than phenotypic correlation for majority of the characters under study except DEP Vs TEL and DEP Vs UEP. These low phenotypic correlations could be due to a modifying effect of environment and the association of characters at genotypic level. Hatching percentage, blue egg percentage and unfertilized egg percentage showed both positive and negative significant correlation to each other. Therefore, proper attention should be given to these characters specially total number of egg laid by female and hatching percentage in selection programme for genetic gain in Bombyx. mori. Key words: Genetic variability, correlation, B. mori.   doi:10.3329/ujzru.v27i0.1946   Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 13-16

scholarly journals Genetic Variability, Heritability And Correlation Study In Hyacinth Bean

1970 ◽  
Vol 36 (2) ◽  
pp. 351-356
Author(s):  
MS Islam ◽  
MM Rahman ◽  
MAK Mian
Keyword(s):  
Genetic Variability ◽  
Correlation Coefficients ◽  
Positive Association ◽  
Correlation Study ◽  
Genetic Advance ◽  
Green Seed ◽  
Pod Yield ◽  
High Heritability ◽  
Selection For ◽  
Hyacinth Bean

Forty four hyacinth bean genotypes were studied to estimate the variability, heritability, genetic advance and correlation coefficients. There was a large variation among the genotypes for all the characters among which the number of pods per plant had highest (122 to 425). Green pod yield per plant varied from 0.46 kg to 3.45 kg indicating the presence of high yielding genotypes. High genotypic coefficient of variation was obtained for 100-green seed weight, pod yield per plant, number of pods per plant and harvesting duration. The highest heritability was observed for days to first flower (98.39%) followed by days to first harvest (96.1 %).The pod yield per plant also exhibited high heritability of 77.9% with highest genetic advance (68.28) indicating the possibility of selection to improve this traits. Yield of green pods showed highly significant and positive association with number of pods per plant (r=0.71**), individual pod weight (r=0.54**) and harvesting duration (r=0.198*), which indicates the importance of these characters during selection for high yielding genotypes in hyacinth bean. Keywords: Genetic variability; heritability; hyacinth bean. DOI: http://dx.doi.org/10.3329/bjar.v36i2.9262 BJAR 2011; 36(2): 351-356

Sign in / Sign up

Export Citation Format

Share Document