Search Results

You are looking at 21 - 30 of 1,783 items for :

  • variance components x
  • All content x
Clear All
Free access

Long Ma, Kevin E. Kenworthy, Huangjun Lu, and Ronald Cherry

common carpetgrass. Table 2. Estimate of variance components, broad-sense heritabilities, minimum, maximum and mean values for number of branches, spikelets per branch, and seed set under self- and open pollination in common carpetgrass. Estimates of

Open access

Sat Pal Sharma, Daniel I. Leskovar, Kevin M. Crosby, and A.M.H. Ibrahim

. Average coordination view of biplot ( A ), and discrimination and representativeness view of biplot ( B ) for marketable fruit yield. Genotype and environment codes are mentioned in Table 1 . Results Analysis of variance of G, E, and G × E components

Full access

Solveig J. Hanson and Irwin L. Goldman

-split plots was represented by δ h i j k l . For estimation of repeatability using variance components (Eq. [2] ), all terms were defined as random. RStudio 1.0.153 (RStudio, Boston, MA) and R 3.4.1 (R Core Team, Vienna, Austria) were used for supplemental

Free access

M. Joseph Stephens, Peter A. Alspach, Ron A. Beatson, Chris Winefield, and Emily J. Buck

. Statistical approach. We calculated variance components, best linear unbiased predictors (BLUP), and empirical breeding values (eBV) ( Henderson, 1977 ) for each trait using the mixed model approach ( Lynch and Walsh, 1998 ) described by Stephens et al. (2012

Open access

Lauren E. Kurtz, Jonathan D. Mahoney, Mark H. Brand, and Jessica D. Lubell-Brand

principal components analysis (PCA) variance for the retained five principal components and DA eigenvalues for the first two linear discriminants. Table 3. Number of bands, polymorphic bands, percent polymorphic bands, and expected heterozygosity (H e

Free access

Rakesh Kumar, Mahendra Dia, and Todd C. Wehner

breeders interested in planning isolation distances, estimating components of genetic variance, or selecting among progenies produced through open-pollination. In cross-pollinated crops, it is often assumed that individuals produced from a single parent are

Free access

Zhengwang Jiang, Feiyan Tang, Hongwen Huang, Hongju Hu, and Qiliang Chen

Smouse, 2001 ). The relative magnitude of genetic differentiation between geographic cultivar groups [Wright's F -statistic ( F ST )] was calculated by different methods implemented in analysis of molecular variance (AMOVA) ( Excoffier et al., 1992 ) and

Full access

Xingbo Wu and Lisa W. Alexander

with the dendrogram based on the neighbor-joining option implemented in MEGA 7 ( Kumar et al., 2016 ), with 500 bootstraps for nodal probability estimates. Genetic variation was calculated by an analysis of molecular variance (AMOVA) using Arlequin 3

Free access

Loong S. Chang, Amy Iezzoni, and Gerald Adams

Heritability and the genetic and environmental variance components of resistance to the canker-causing pathogen Leucostoma persoorrii were estimated in a population of diverse peach (Prunus persica L.)-genotypes. Disease resistance was measured as the length of necrotic tissue, i.e., canker length, following artificial inoculation in the field. Genetic and environmental variations were partitioned as variance components of the linear statistical model. Heritability was estimated by regressing average performance of seedlings on performance of their maternal parent. The genetic variance was highly significant, and the heritability for canker necrotic length was relatively high (0.72), suggesting that it should be possible to select L. persoonii -resistant individuals within the population.

Free access

Masahiko Yamada, Akihiko Sato, and Yasuo Ukai

Environmental variance components were estimated for calyx-end fruit cracking in pollination-constant and nonastringent cultivars and selections of Japanese persimmon (Diospyros kaki Thunb.). The cracking value of a tree in a cultivar or selection (genotype) (X) was evaluated as the number of fruit that cracked divided by the total number (25) of fruit evaluated from each tree. Because the mean value of X was correlated with the variance of X, analyses of variance were performed using its square root value. The variance associated with genotyp× year interaction was the largest of environmental variance components. The variances associated among years and among trees within genotypes were very small. The mean percentage of cracked fruit in evaluation for 10 years was 3% for `Fuyu', 11% for `Matsumotowase-Fuyu', and 12% for `Izu'. On the basis of the environmental variance components obtained, it is proposed that all offspring genotypes exhibiting a phenotypic cracking incidence of less than 20% and 11% should be selected in single-year and three-year evaluations, respectively, when those genotypes are evaluated using 25 fruits from a single tree, in order to successfully select all genotypes with an genotypic incidence of less than 3%.