scholarly journals Genetic and Environmental Variance in Seed and Cone Characteristics of Black Spruce in a Northwestern Ontario Seed Orchard

1983 ◽  
Vol 59 (4) ◽  
pp. 191-193 ◽  
Author(s):  
Faye J. Verheggen ◽  
Robert E. Farmer Jr.
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Black Spruce ◽  
Seed Orchard ◽  
Environmental Variance ◽  
Northwestern Ontario ◽  
Seed Yield Components ◽  
Percent Number

Germination and some seed yield components were evaluated using 1981 cones from ramets of nine clones in a Northwestern Ontario seed orchard. No evidence of dormancy was observed in seed which received no chilling and were germinated under light. Hierarchical analyses of variance indicated that both clones and ramets within clones accounted for substantial amounts of variation in germination percent, filled seed percent, number of seed per cone and cone size. Cone size was only weakly correlated with number of seed per cone (r =.44).

Genetic and environmental variance in cone size, seed yield, and germination properties of black spruce clones

1986 ◽  
Vol 16 (5) ◽  
pp. 1149-1151 ◽  
Author(s):  
M. U. Stoehr ◽  
R. E. Farmer Jr.
Keyword(s):  
Seed Yield ◽  
Black Spruce ◽  
Seed Orchard ◽  
Total Variance ◽  
Environmental Variance ◽  
Northern Ontario

Genetic and environmental variances in cone size, seed yield, and germination properties were evaluated for Piceamariana (Mill.) B.S.P. using material from ramets of 19 clones in a northern Ontario seed orchard. Thirty-seven percent of the variance in cone volume (mean, 2.2 cm3) was accounted for by differences among clones (range, 1.3–3.5 cm3) and 19% was accounted for by ramets within clones. Clone means for number of seed per cone ranged from 49 to 100 and averaged 71; 18% of seed was filled. Clonal variances for number of seed per cone and percent filled seed were 31 and 23% of the total variance, while ramets accounted for 18 and 13%, respectively. Germination of filled seed averaged 68% and clone means ranged from 28 to 90%. Sixty-seven percent of the variation in germination percent was due to clonal differences and 18% was associated with ramets.

Is the flag leaf important in perennial ryegrass seed production?

2010 ◽  
Vol 14 ◽  
pp. 67-73
Author(s):  
J.A.K. Trethewey ◽  
M.P. Rolston
Keyword(s):  
Seed Yield ◽  
Perennial Ryegrass ◽  
Yield Components ◽  
Seed Weight ◽  
Photosynthetic Capacity ◽  
Flag Leaf ◽  
Active Radiation ◽  
Seed Yield Components ◽  
Seed Fill ◽  
Thousand Seed Weight

In cereals, the importance of the flag leaf for contributing carbohydrate during seed fill is well documented. However, in ryegrass this relationship is not so clear. This paper reports on an investigation of the effect on seed yield components of reduced photosynthetic capacity to the flag leaf, stem and head of perennial ryegrass (Lolium perenne). The hypothesis was that reduced photosynthetic capacity of the flag leaf does not affect seed yield components in perennial ryegrass. Following flowering, photosynthetic capacity was reduced by defoliation or shading the flag leaf, stem, or head of individual tillers. Seed yield components were measured at harvest. Reduced photosynthetically active radiation (PAR) to the flag leaf and stem did not affect thousand seed weight or seed yield when compared with control plants whereas reducing PAR to the head had a significant effect. The seed head itself may be more important than the flag leaf during seed fill, but when the seed head is shaded substantial re-mobilisation of stored carbohydrates can occur. Keywords: flag leaf, green leaf area, Lolium perenne, photosynthetically active radiation, seed fill, seed yield, thousand seed weight, water-soluble carbohydrates

scholarly journals Genetic variation for seed yield components of Westerwold ryegrass (Lolium multiflorum var. westerwoldicum).

1989 ◽  
Vol 37 (2) ◽  
pp. 119-127 ◽  
Author(s):  
A. Elgersma ◽  
A.P.M. Den Nijs ◽  
F.A. Van Eeuwijk
Keyword(s):  
Genetic Variation ◽  
Seed Yield ◽  
Yield Components ◽  
Lolium Multiflorum ◽  
Genotypic Variation ◽  
Yield Component ◽  
Path Analyses ◽  
Seed Yield Components ◽  
High Heritability ◽  
1000 Grain Weight

Genetic variation for seed yield components was studied in 4 diploid varieties of Westerwold ryegrass, and 19 genotypes from each variety were grown in the field in 2 clonal replicate rows (minirows). The number of inflorescences/minirow, the numbers of spikelets/inflorescence and florets and seeds/spikelet, 1000-grain weight and seed yield/minirow were determined. Floret site utilization (FSU) was calculated as (seeds/floret) x 100%. Genotypic variation and heritabilities were calculated. Correlation studies and path analyses were carried out in each variety separately. Among varieties, no significant differences occurred for seed yield. However, within varieties large genetic variation was present for both seed yield and yield components. Path analyses revealed that relationships between seed yield components differed to a great extent among varieties. FSU was the major yield component in 3 varieties, but in one variety inflorescence number was the most important yield component. There was ample scope for genetic improvement of seed yield. FSU had a very high heritability and was not correlated with any of the other seed yield components. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Heritabilities and phenotypic correlations for seed yield and seed yield components of beans

1969 ◽  
Vol 72 (2) ◽  
pp. 301-308
Author(s):  
Manuel Mateo Solano ◽  
James S. Beaver ◽  
Freddy Saladín García
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Narrow Sense ◽  
Phenotypic Correlations ◽  
Seed Yield Components ◽  
F2 Generation ◽  
Seed Yields ◽  
Advanced Generation ◽  
Weight Number ◽  
100 Seed Weight

Indeterminate bean (Phaseolus vulgaris L.) lines derived from crosses between small-seeded indeterminate and large-seeded determinate genotypes were used to estimate the heritabilities and phenotypic correlations for seed yield and seed yield components. The F2  generation of six bean populations was planted at the Fortuna Substation, Juana Díaz, Puerto Rico, in October 1984. Seed yield per plant, 100 seed weight, number of pods per plant, and number of seed per pod were measured for 50 plants selected at random from each population. A total of 50 F3 plant rows of each population were planted in February 1985 at the Fortuna Substation, and in March 1985 on a small farm in the Constanza valley of the Dominican Republic. Narrow sense heritabilities were estimated by using parent-offspring regressions of the F2 and F3 generation, and phenotypic correlations were estimated by using means of the F3 lines. Mean seed yields per plant of the indeterminate F3 lines were significantly less than the indeterminate parents, whereas the 100-seed weights of the indeterminate F3 were significantly less than the determinate parents. Narrow sense heritabilities for seed yield and seed yield components were intemediate to low. These results indicate that selection for greater seed yield would be more effective by evaluating advanced lines in replicated trials. Spearman rank correlations between locations for seed yield and seed yield components varied among populations. Multilocation testing of advanced generation lines may be the most effective way to identify bean genotypes that perform well in contrasting environments.

Evaluation of seed yield and seed yield components in red–yellow (Pisum fulvum) and Ethiopian (Pisum abyssinicum) peas

2012 ◽  
Vol 60 (2) ◽  
pp. 629-638 ◽  
Author(s):  
Aleksandar Mikić ◽  
Vojislav Mihailović ◽  
Miodrag Dimitrijević ◽  
Sofija Petrović ◽  
Branko Ćupina ◽  
...  
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Pisum Fulvum ◽  
Seed Yield Components

Partitioning Soybean Seed Yield Components 1

Crop Science ◽  
1982 ◽  
Vol 22 (5) ◽  
pp. 1074-1079 ◽  
Author(s):  
S. J. Herbert ◽  
G. V. Litchfield
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Soybean Seed ◽  
Seed Yield Components
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