Apex, lamina and shoot removal effects on seed production and growth of Stylosanthes hamata cv. Verano

1979 ◽  
Vol 30 (2) ◽  
pp. 293 ◽  
Author(s):  
B Wilaipon ◽  
SA Gigir ◽  
LR Humphreys
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Floral Initiation ◽  
Seed Setting ◽  
Seed Formation ◽  
Stylosanthes Hamata ◽  
Seed Yield Components ◽  
Leaf Differentiation ◽  
Delayed Flowering ◽  
Bud Site

Swards of Stylosanthes hamata cv. Verano were simulated by growing plants in irrigated square pots placed edge to edge and discarding border rows. The effects on the events leading to seed formation of removing (1) all shoot apices, (2) apices plus 60% of laminae and (3) shoots supporting 60% of laminae were studied, when these treatments were applied at (1) a vegetative stage, (2) early floral initiation and (3) advanced floral initiation. Defoliation delayed flowering and reduced growth rates for 10–30 days subsequently, these effects increasing if bud sites were removed in addition to lamina and apices. In this heated glasshouse the final seed yield and most of the seed yield components were similar in all treatments, including undefoliated swards. Seed yield increased from 141 to 171 g m-2 when 60% of laminae only were removed at an early seed-setting stage in well-grown swards (LAI 6.9). In a subsequent experiment, removal of 33% of laminae at a similar advanced developmental stage increased seed yield from 106 to 180 g m-2, and other late defoliation treatments did not significantly influence seed yield. These effects are discussed in terms of altered patterns of apical dominance and leaf differentiation, bud site removal, assimilate supply to the inflorescences, and the consequences of delayed flowering.

EFFECTS OF HARVEST TIME AND ALAR-85 ON SEED YIELD OF RED CLOVER

1990 ◽  
Vol 70 (3) ◽  
pp. 869-871 ◽  
Author(s):  
B. R. CHRISTIE ◽  
T. M. CHOO
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Harvest Time ◽  
Seed Setting ◽  
Seed Yield Components ◽  
Trifolium Pratense L ◽  
One Year ◽  
Seed Yields

Effects of harvest time and the growth regulator Alar-85 on seed yield and seed-yield components of red clover (Trifolium pratense L.) were studied. Data were collected from the primary growth (first crop) and from the aftermath (second crop). The second crop outyielded the first crop in one year and yielded the same in another year. Alar-85 shortened corolla tubes in all four cultivars and reduced plant height in three cultivars. It increased seed yields of the second crop of Dollard and Hungaropoli by more than 100%, through increases in seed setting and the number of heads per m2.Key words: Red clover, Trifolium pratense L., seed yield, Alar-85, harvest time

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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