scholarly journals ESTIMATION OF VARIANCES , GENOTYPIC AND PHENOTYPIC CORRELATIONS FOR SOME TRAITS OF MAIZE UNDER HIGHEST UNDUR NITROGEN ABUNDANCE

2016 ◽  
Vol 47 (4) ◽  
Author(s):  
S. J. Bunder
Keyword(s):  
Selection Index ◽  
Diallel Cross ◽  
Grain Weight ◽  
Broad Sense ◽  
Phenotypic Correlation ◽  
Broad Sense Heritability ◽  
Coefficients Of Variation ◽  
Significant Difference ◽  
Genotypic And Phenotypic Correlations ◽  
Nitrogen Abundance

The objective of this study was estimation of variances, broad sense heritability genotypic and phenotypic correlation for some traits of  maize  under  nitrogen abundance . the experiment was conducted at the farm of the Dept. of  Field Crop Sci., College of Agric., Univ. of  Baghdad during the Spring and fall seasons of 2012 under level 400 Kg N. ha rate-1 . Diallel cross was performed among four maize inbred lines (Zm7, Zm607, Oh40, Zr8) to produce six single crosses in spring season . The seeds of parents and crosses were sown in fall season using R.C.B.D. with three replicates. The results showed significant difference among genotypes and the values of the genotypic variance were more than environment variance in all studied characters. The values of phenotypic coefficients of variation larger than the genotypic and the higher rate of genotypic coefficient of variation for 300 grain weight 16.74, no. of grain per row 15.05 and leaves area 12.18. furthermore high estimates of broad sense heritability were observed for all characters and the highest value 81.45 for 300 weight grain and 75.31 for leaves area .The grain yield gave high significant negative genotypic and phenotypic with silking date and positive with plant height , leaves area , no. of grain per row , 300 grain weight. It was concluded that a breeder can use leaves area , no. of grain per row and grain weight as selection index  in selection program of  maize under high nitrogen

High Heritability of Glycyrrhizic Acid, Glabridin, Liquiritin and Liquiritigenin in Licorice (Glycyrrhiza Glabra L.) Populations of Iran

2021 ◽  
Author(s):  
Ghasem Eghlima ◽  
Mohsen Sanikhani ◽  
Azizollah Kheiry ◽  
Javad Hadian
Keyword(s):  
Coefficient Of Variation ◽  
Morphological Traits ◽  
Glycyrrhizic Acid ◽  
Correlation Coefficients ◽  
Glycyrrhiza Glabra ◽  
Broad Sense ◽  
Phenotypic Correlation ◽  
Broad Sense Heritability ◽  
Narrow Sense Heritability ◽  
Perennial Plant

Abstract Glycyrrhiza glabra L. is an herbaceous, perennial plant with high distribution in Iran. Genetic variability, heritability and correlation among characters in 22 populations of G. glabra L. were studied. The genetic parameters among the traits including phenotypic variances, genotypic variances, genotype by environment variances, broad-sense heritability and genotypic and phenotypic correlation coefficients were studied. Variance components analysis showed that the extent of phenotypic coefficient of variation (PCV) was fairly higher for all the examined traits compared with genotypic coefficient of variation (GCV). Glabridin (GLA) exhibited high GCV and PCV (156.07% and 156.68%, respectively). The broad sense heritability varied from 38.92–99.79% and narrow sense heritability ranged from 9.70 % to 24.94%. Heritability of GLA, glycyrrhizic acid (GLY), liquiritin (LI), liquiritigenin (LIQ), rutin (RU) and rosmarinic acid (RA) were very high, exhibiting more than 97% heritability. Therefore, these critical characteristics can efficiently be selected and inherited in breeding programs. In most traits, the genotypic correlations showed the same direction as the phenotypic correlations. The contents of GLA and LIQ showed a positive correlation with majority of morphological traits. Therefore, selecting individual plants having desired morphological traits can be correlated with high contents of bioactive compounds in the harvested root.

scholarly journals Estimates of genetic variability and association studies in quantitative plant traits of Eruca spp. landraces

Genetika ◽  
2010 ◽  
Vol 42 (3) ◽  
pp. 501-512 ◽  
Author(s):  
Kadri Bozokalfa ◽  
Eşiyokhülya İlbi ◽  
Kaygisiz Aşçioğul
Keyword(s):  
Genetic Variability ◽  
Agronomic Traits ◽  
Plant Traits ◽  
Association Studies ◽  
Broad Sense ◽  
Breeding Programme ◽  
Phenotypic Correlation ◽  
Broad Sense Heritability ◽  
Limited Information ◽  
Plant Weight

Despite the increasing of economical importance of rocket plant limited information is available on genetic variability for the agronomic traits among Eruca spp. Hence, heritability and association studies of plant properties are necessities for a successful further rocket breeding programme. The objective of this study was to examine phenotypic and genotypic variability, broad sense heritability, genetic advance, genotypic and phenotypic correlation and mean for agronomic traits of rocket plant. The magnitude of phenotypic coefficient of variation values for all the traits were higher than the corresponding values and broad sense heritability estimates exceeded 65% for all traits. Phenotypic coefficients of variability (PCV) ranged from 7.60 to 34.34% and genotypic coefficients of variability (GCV) ranged between 5.58% for petiole thickness and 34.30% for plant weight. The results stated that plant weight, siliqua width, seed per siliqua and seed weight could be useful character for improved Eruca spp. breeding programme.

Performance, heterosis and heritability in selected tropical maize single, double and three-way cross hybrids

2002 ◽  
Vol 138 (1) ◽  
pp. 21-28 ◽  
Author(s):  
G. B. SALEH ◽  
D. ABDULLAH ◽  
A. R. ANUAR
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Block Design ◽  
Grain Weight ◽  
Broad Sense ◽  
Broad Sense Heritability ◽  
Tropical Maize ◽  
Randomized Complete Block Design ◽  
Parental Inbred ◽  
Ear Number

A series of tropical maize hybrids, involving 10 single, four double and four three-way crosses were evaluated with their parental inbred lines and three control varieties, at Universiti Putra Malaysia, Serdang, Malaysia, in a randomized complete block design, with three replications. The objectives were to identify hybrids superior for yield, yield components and other agronomic traits, to estimate heterosis revealed by the hybrids, and to estimate broad-sense heritability for important characters in the populations. The hybrids were found to vary highly for grain yield and most other traits measured. High estimates of heterosis were shown by grain yield, ear weight and grain weight per ear, moderate for plant and ear heights, shelling percentage, ear diameter, number of kernel rows per ear, number of kernels per ear row and 100-grain weight. The hybrids flowered and matured earlier than their respective inbred parents. Estimates of broad-sense heritability also varied with characters. Moderate heritability was shown for grain yield indicating a substantial amount of genetic variation in this population of hybrids. Low and negligible heritability for days to silking and 100-grain weight indicate that these traits were very much influenced by environmental factors. Based on the overall performance of the hybrids, the single cross, SC-2, the double cross, DC-11 and the three-way cross, TWC-15, were found to have high potential. No obvious differences were observed in performance among the three categories of hybrids, the single, double and three-way crosses.

Changes in the components of phenotypic variance and covariance among traits during ontogeny in the sharp-snouted rock lizard (Lacerta oxycephala)

1994 ◽  
Vol 15 (1) ◽  
pp. 47-61 ◽  
Author(s):  
I. Aleksic ◽  
N. Tucic
Keyword(s):  
Genetic Correlation ◽  
Broad Sense ◽  
Phenotypic Correlation ◽  
Phenotypic Variance ◽  
Broad Sense Heritability ◽  
Multivariate Statistical ◽  
Correlation Structures ◽  
Rock Lizard ◽  
Ontogenetic Allometry ◽  
Absolute Measurements

AbstractWe estimated changes in the components of phenotypic variance and covariance among seven metric traits over the first 90 days of growth in the sharp-snouted rock lizard (Lacerta oxycephala). The broad-sense heritability estimated from the data representing mostly size components of the seven morphometic traits over four age periods was about 90%. The average broad-sense heritability for the shape components of the same traits and age periods amounted to about 42%. By using bivariate and multivariate statistical methods, ontogenetic allometry coefficients have been estimated. The average heritability estimated for the bivariate allometric coefficients was about 69%. Genetic correlation structures were highly integrated within each age period and this integration increased from newborn lizards to lizards aged up to 90 days. For absolute measurements, phenotypic correlation structures were less integrated than genetic correlation structures, while for size-free measurements the opposite trend was observed.

scholarly journals Genetic Variability Studies on Twelve Genotypes of Rice (Oryza sativa L.) for Growth and Yield Performance in South Eastern Nigeria

2017 ◽  
Vol 9 (1) ◽  
pp. 110-115 ◽  
Author(s):  
Vincent N. ONYIA ◽  
Emeke C. OKECHUKWU ◽  
Agatha I. ATUGWU ◽  
Ndueso M. AKPAN
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Agronomic Traits ◽  
Oryza Sativa L ◽  
Broad Sense ◽  
Growth And Yield ◽  
Rice Grain ◽  
Broad Sense Heritability ◽  
Significant Difference ◽  
Days To Maturity

Twelve genotypes of rice collected from the National Cereals Research Institute (NCRI), Badeggi, Bida, Niger State, Nigeria were evaluated to estimate the magnitude of genetic variability and relationship of some agronomic traits of rice and their contributions to yield. The results obtained showed a significant difference (p ≤ 0.05) among the genotypes in all the traits studied. Genotype ‘WAB 35-1-FX2’ produced a significantly higher grain yield of 3.40 t/ha compared with all the other genotypes in the two years combined. Genotypes ‘WAB 33-25’, ‘WAB 56-1-FX2’, ‘WAB 56-39’, ‘WAB 56-125’, ‘ITA 150’ and ‘FAROX 16 (LC)’ were the most stable grain yielding genotypes across the two years of the experiment. High broad sense heritability (h2bs) was associated with grain yield (h2bs = 98.63%), number of spikelets/panicle (98.78%), plant height (98.34%) for the first year planting, whereas in the second year planting, days to 50% flowering (96.72%), days to maturity (94.14%) and grain yield (83.33%) were among the traits that showed high broad sense heritability. The two years combined correlation analysis showed that grain yield correlated significantly and positively with number of spikelets/panicle (r = 0.2358*), number of panicles/m2 (r = 0.1895*), number of fertile spikelets/panicle (r = 0.1672*) and 1,000 grain weight (r = 0.1247*), indicating that these traits can be phenotypic basis for improving grain yield of rice. Conversely, grain yield exhibited negative correlation with days to 50% flowering (-0.3009) and days to maturity (-0.2650), though not significant. This suggests that rice grain yield can be improved by selecting early flowering and maturing genotypes especially under heat and drought prone conditions.

scholarly journals Heritability and correlation coefficient analysis for grain yield and yield-related traits in spring barley (Hordeum vulgare L.)

2021 ◽  
Vol 13 (Volume 13, Issue 2) ◽  
pp. 129-133
Author(s):  
B. Dyulgerova ◽  
D. Valcheva ◽  
D. Valchev ◽  
M. Babulicova ◽  
M. Havrlentova
Keyword(s):  
Grain Yield ◽  
Spring Barley ◽  
Block Design ◽  
Grain Weight ◽  
Broad Sense ◽  
Hordeum Vulgare L ◽  
Coefficients Of Variation ◽  
Grain Number Per Spike ◽  
Barley Genotypes ◽  
1000 Grain Weight

Abstract. The objectives of this study were to estimate the heritability of yield and yield-related traits and to compute the correlation of grain yield with yield-related traits among the spring barley genotypes. The experiment was laid out in a complete block design with three replications in the Institute of Agriculture – Karnobat, Bulgaria during two consecutive years 2017 and 2018. Genotypes differed significantly for all the traits studied. Genotypic coefficients of variation were lower than the corresponding phenotypic coefficients in all the traits studied, indicating a considerable influence of the environment on the expression of the traits. Estimates for broad-sense heritability ranged from 0.65% for grain number per spike to 44.20% for 1000-grain weight. Moderate heritability coupled with relatively high genetic advance as a percent of the mean was found for 1000-grain weight suggesting a reliable possibility for improvement through selection. A significant and positive correlation between grain yield and number of spikes per m2 and grain weight per spike was found. Results of path analysis showed that grain weight per spike and number of spikes per m2 exhibited the highest direct effects on grain yield. The number of spikes per m2 was highly associated with grain yield but mostly influenced by environmental effects. The grain weight per spike should be prioritized for selection of superior spring barley genotypes under conditions of Southeast Bulgaria due to its highest direct effect on grain yield combined with higher heritability than that of grain yield. Moreover, it must be considered that the grain weight per spike had relatively low heritability in a broad-sense so the selection should be practised in later generations in replicated trials.

Daya Hasil 12 Hibrida Harapan Jagung Manis (Zea maysL. var. saccharata) di Kabupaten Maros, Sulawesi Selatan

2013 ◽  
Vol 1 (1) ◽  
pp. 14 ◽  
Author(s):  
Hesti Paramita Sari ◽  
. Suwarto ◽  
Muhamad Syukur
Keyword(s):  
Sweet Corn ◽  
Selection Index ◽  
Broad Sense ◽  
Total Soluble Solid ◽  
Yield Potential ◽  
Broad Sense Heritability ◽  
Plant Breeding Program ◽  
Two Factors ◽  
Soluble Solid ◽  
Research Institute

<p style="text-align: justify;">The objective of this research was to evaluate yield potential of 12 sweet corn promising hybrids from Plant    Breeding Program (Bogor Agricultural University) and Indonesian Cereals Research Institute colection. This research was conducted at experimental field Indonesian Cereals Research Institute, in Maros, South Sulawesi, from June to August 2011. The genotypes used were : IM-12, IM-13, IM-14, IM-15, IM-16, IM-23, IM-24, IM-25, IM-34, IM-35, IM-45, IM-55, and three comercial varieties i.e. Super Sweet Corn, Sweet Boy, and Talenta. The design of this research was Randomized Complete Block Design with four replications. Data was analyzed with F-test then continued with Dunnett test (α=5%). Selection index was used for choosing the best genotype. Interaction between two factors, i.e. genotype and year, was analyzed with combined variance analysis using primary data from this research and secondary data from last year research (done from April to June 2010). Broad sense heritability was estimated from this two-factors analysis. The result from this research was the sweet corn productivity was not affected by genotype, but affected by genotype and year interaction. On the other hand, total soluble solid was affected by genotype, but not affected by interaction between genotype and year. Among characters evaluated, total soluble solid had highest broad sense heritability. Based on selection index, IM-16 was a promising hybrid and can be developed to be new commercial variety.</p><p>Keywords: yield trial, sweet corn hybrid, selection index, broad sense heritability</p>

Percentile transformation and recalibration functions allow harmonization of thyroid-stimulating hormone (TSH) immunoassay results

2020 ◽  
Vol 58 (10) ◽  
pp. 1663-1672 ◽  
Author(s):  
Andrea Padoan ◽  
Aldo Clerico ◽  
Martina Zaninotto ◽  
Tommaso Trenti ◽  
Renato Tozzoli ◽  
...  
Keyword(s):  
Robust Regression ◽  
Reference Intervals ◽  
Thyroid Stimulating Hormone ◽  
Validation Dataset ◽  
New Approach ◽  
Coefficients Of Variation ◽  
Significant Difference ◽  
Before And After ◽  
Roche Diagnostics ◽  
Stimulating Hormone

AbstractBackgroundThe comparability of thyroid-stimulating hormone (TSH) results cannot be easily obtained using SI-traceable reference measurement procedures (RPMs) or reference materials, whilst harmonization is more feasible. The aim of this study was to identify and validate a new approach for the harmonization of TSH results.MethodsPercentile normalization was applied to 125,419 TSH results, obtained from seven laboratories using three immunoassays (Access 3rd IS Thyrotropin, Beckman Coulter Diagnostics; Architect System, Abbott Diagnostics and Elecsys, Roche Diagnostics). Recalibration equations (RCAL) were derived by robust regressions using bootstrapped distribution. Two datasets, the first of 119 EQAs, the second of 610, 638 and 639 results from Access, Architect and Elecsys TSH results, respectively, were used to validate RCAL. A dataset of 142,821 TSH values was used to derive reference intervals (RIs) after applying RCAL.ResultsAccess, Abbott and Elecsys TSH distributions were significantly different (p < 0.001). RCAL intercepts and slopes were −0.003 and 0.984 for Access, 0.032 and 1.041 for Architect, −0.031 and 1.003 for Elecsys, respectively. Validation using EQAs showed that before and after RCAL, the coefficients of variation (CVs) or among-assay results decreased from 10.72% to 8.16%. The second validation dataset was used to test RCALs. The median of between-assay differences ranged from −0.0053 to 0.1955 mIU/L of TSH. Elecsys recalibrated to Access (and vice-versa) showed non-significant difference. TSH RI after RCAL resulted in 0.37–5.11 mIU/L overall, 0.49–4.96 mIU/L for females and 0.40–4.92 mIU/L for males. A significant difference across age classes was identified.ConclusionsPercentile normalization and robust regression are valuable tools for deriving RCALs and harmonizing TSH values.

scholarly journals Genetic variation and correlation of agronomic traits in meadow bromegrass (Bromus riparius Rehm) clones

2004 ◽  
Vol 34 (2) ◽  
pp. 505-510 ◽  
Author(s):  
Marcelo Renato Alves de Araújo ◽  
Bruce Coulman
Keyword(s):  
Genetic Variation ◽  
Crude Protein ◽  
Genetic Correlations ◽  
Neutral Detergent Fiber ◽  
Broad Sense ◽  
Grass Species ◽  
Broad Sense Heritability ◽  
Bromus Riparius ◽  
Heritability Estimates ◽  
Meadow Bromegrass

Meadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. As relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate total genetic variability, broad-sense heritability, phenotypic and genetic correlations. Forty-four meadow bromegrass clones were evaluated for agronomic characters. Genetic variation for dry matter yield, seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fiber and acid detergent fiber, was significant. Broad-sense heritability estimates exceeded 50% for all characters. Heritability estimates were at least 3.5 times greater than their standard errors. Phenotypic and genetic correlation between all possible characters were measured. There was general agreement in both sign and magnitude between genetic and phenotypic correlations. Correlations between the different characters demonstrated that it is possible to simultaneously improve seed and forage yield. Based on the results, it appears that the development of higher yielding cultivars with higher crude protein, and lower acid and neutral detergent fibers concentration should be possible.

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