scholarly journals Do plant ploidy and pollinator tongue length interact to cause low seed yield in red clover?

Ecosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
Author(s):  
Veronica Hederström ◽  
Maj Rundlöf ◽  
Göran Birgersson ◽  
Mattias C. Larsson ◽  
Anna Balkenius ◽  
...  
Keyword(s):  
Seed Yield ◽  
Red Clover ◽  
Tongue Length

INFLUENCE DES CULTIVARS ET DES STADES DE PRÉLÈVEMENT DE LA PREMIÈRE POUSSE SUR LA PRODUCTION DE SEMENCE DE TRÈFLE ROUGE

1990 ◽  
Vol 70 (4) ◽  
pp. 1071-1080 ◽  
Author(s):  
LUCIUS BELZILE
Keyword(s):  
Seed Germination ◽  
Seed Production ◽  
Seed Yield ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Kernel Weight ◽  
Climatic Conditions ◽  
Cultivar Group ◽  
Stage Of Development ◽  
Clover Seed

For five years, the effect of cultivars and vegetative stage of cutting were measured on red clover (Trifolium pratense L.) seed production. The first group of cultivars included Hungaropoli, Ottawa and Lakeland harvested in 1981 and 1982. The second group included Arlington, Florex and Prosper I harvested in 1984, 1985 and 1987. The total annual seed yield differed within cultivars and the highest seed yield was obtained with Hungaropoly and Florex. In the first cultivar group, the tetraploid Hungaropoly obtained a kernel weight higher than the diploids Lakeland and Ottawa. In the second group of cultivars, all diploids, Arlington yielded the highest kernel weight. The percentage of seed germination of Hungaropoly was higher than Lakeland and Ottawa while for Florex it was slightly higher than Arlington and Prosper I. A prior vegetative cutting is essential for good seed yield. In the absence of vegetative cutting seed weight seemed improved. The stage of development at which vegetative cutting is done has little influence on percentage seed germination. These results have shown that despite the strong effect of climatic conditions on seed production, the choice of the optimum stage for vegetative cutting and a well adapted cultivar are important aspects in successful seed production.Key words: Red clover, seed production, cultivar, stage of cutting

scholarly journals Creating and Characterisation of New Red Clover Variety ‘Jancis’/ Sarkanâ Âboliòa Ðíirnes ‘Jancis’ Izveidoðana Un Tâs Raksturojums

2014 ◽  
Vol 68 (3-4) ◽  
pp. 180-183
Author(s):  
Biruta Jansone ◽  
Sarmīte Rancāne ◽  
Pēteris Bērziņš ◽  
Aldis Jansons
Keyword(s):  
Seed Yield ◽  
Red Clover ◽  
Climatic Conditions ◽  
Family Selection ◽  
High Dry Matter ◽  
Bright Pink ◽  
Long Stem ◽  
Dark Green ◽  
High Seed Yield

Abstract The aim of this work was to develop a red clover variety adapted to agro-climatic conditions of Latvia, suitable for different requirements of forage producers, resistant to most widespread diseases and producing high seed yield annually. Medium late ripening diploid red clover variety ‘Jancis’ was created at the LLU Research Institute of Agriculture in long-term work carried out since 1985. After free pollination of best samples of red clover collections from the VIR (St. Petersburg), individual and family selection among hybrids were carried out for approximately 20 years. Finally, best breeding line Nr. 43047 was registered as a variety ‘Jancis’. The variety is characterised by good winter hardiness, high dry matter yield (10-12 t·ha-1) and good persistence in the sward - up to 3-4 years. The variety is characterised by a long stem (90-110 cm) with 8-9 internodes, dark green leaves with a distinctive brighter picture, medium length and width of medial leaflet, and bright pink flower heads. ‘Jancis’ has stable annual seed yield in the conditions of Latvia; under favourable conditions reaching 500- 600 kg·ha-1 seeds. Since 2010, the variety ‘Jancis’ has been included in the common Latvian and EU Plant Variety Catalogue.

Irrigation and Trinexapac-Ethyl Effects on Seed Yield in First- and Second-Year Red Clover Stands

2016 ◽  
Vol 108 (3) ◽  
pp. 1116-1123 ◽  
Author(s):  
Nicole P. Anderson ◽  
Thomas G. Chastain ◽  
Carol J. Garbacik
Keyword(s):  
Seed Yield ◽  
Red Clover ◽  
Second Year

Influence of flower and flowering characteristics on seed yield in diploid and tetraploid red clover

2014 ◽  
Vol 134 (1) ◽  
pp. 56-61 ◽  
Author(s):  
Tim Vleugels ◽  
Isabel Roldán-Ruiz ◽  
Gerda Cnops
Keyword(s):  
Seed Yield ◽  
Red Clover

The effect of fertilizers on the yield of red clover seed

1962 ◽  
Vol 59 (1) ◽  
pp. 13-23 ◽  
Author(s):  
J. W. Dent ◽  
R. P. Hawkins
Keyword(s):  
Seed Yield ◽  
Red Clover ◽  
Mineral Status ◽  
High Yields ◽  
Clover Seed ◽  
Initial Mineral

The effect of fertilizers in increasing the yield of clover seed was examined by a series of manurial trials. The initial mineral status of the crop and the extent of the uptake of the applied nutrients were determined by analyses of the leaf. The techniques for sampling and analysing leaves to determine mineral status are described.The high yields of seed and lack of response to fertilizers in trials at Cambridge led to their being repeated at Saxmundham on land known to be extremely deficient in minerals. Even then there was a response only to phosphate which although significant was small.Leaf samples were also collected from commercial crops of red clover in 1955, 1956 and 1957. The analyses of these samples indicted that none of them was as deficient as the crops at Saxmundham, and no relationship was found between mineral status and seed yield.It is concluded that yields of red clover seed in Eastern England are not likely to be increased materially by the application of fertilizers.

scholarly journals Drastic historic shifts in bumble-bee community composition in Sweden

2011 ◽  
Vol 279 (1727) ◽  
pp. 309-315 ◽  
Author(s):  
Riccardo Bommarco ◽  
Ola Lundin ◽  
Henrik G. Smith ◽  
Maj Rundlöf
Keyword(s):  
Seed Yield ◽  
Red Clover ◽  
Wild Plants ◽  
Bumble Bee ◽  
Management Schemes ◽  
Relative Abundances ◽  
Bee Community ◽  
Flower Visiting ◽  
Clover Seed ◽  
Seed Yields

The species richness of flower-visiting insects has declined in past decades, raising concerns that the ecosystem service they provide by pollinating crops and wild plants is threatened. The relative commonness of different species with shared ecological traits can play a pervasive role in determining ecosystem functioning, but information on changes in abundances of pollinators over time is lacking. We gathered data on relative abundances of bumble-bee species in Swedish red clover fields during three periods in the last 70 years (1940s, 1960s and present), and on clover seed yields since 1921. We found drastic decreases in bumble-bee community evenness, with potential consequences for level and stability of red clover seed yield. The relative abundances of two short-tongued bumble-bees have increased from 40 per cent in the 1940s to entirely dominate present communities with 89 per cent. Average seed yield declined in recent years and variation in yield doubled, suggesting that the current dependence on few species for pollination has been especially detrimental to stability in seed yield. Our results suggest a need to develop management schemes that promote not only species-rich but also more evenly composed communities of service-providing organisms.

Corolla Tube Length and Nectar Height of Fl Red Clover Plants (Trifolium pratense) and Their Seed Yield Following Honey-Bee Pollination

1968 ◽  
Vol 70 (1) ◽  
pp. 5-10 ◽  
Author(s):  
D. A. Bond ◽  
J. L. Fyfe
Keyword(s):  
Genetic Variation ◽  
Seed Yield ◽  
Honey Bees ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Corolla Tube ◽  
Inbred Lines ◽  
Tube Length ◽  
Bee Pollination ◽  
Continental Origin

SummaryCrosses between nine inbred lines of diploid doublecut red clover were measured for corolla tube length and nectar height, caged with honey-bees, and observations made on the number of bee visits and seed yield. There was evidence of additive genetic variation in nectar height, corolla tube length, bee visits and seed yield. The possibilities for improvement in these characters by selection are discussed. Attention is drawn to a remarkable discriminating behaviour of honey-bees, in that they could apparently recognize plants which had only one parent in common. A cage with a strong colony of honey-bees produced more than twice as much seed as a cage with a weak colony, and plants near to hives gave significantly more seed than plants distant from hives. Plants of English origin tended to have higher and more accessible nectar, more bee visits and greater seed yield than plants of continental origin.

Influence of Environment and Clipping on the Seed‐Yield Potential of Three Red Clover Cultivars 1

Crop Science ◽  
1977 ◽  
Vol 17 (1) ◽  
pp. 58-60 ◽  
Author(s):  
C. M. Rincker ◽  
J. G. Dean ◽  
C. S. Garrison ◽  
R. G. May
Keyword(s):  
Seed Yield ◽  
Red Clover ◽  
Yield Potential

MANAGEMENT OF MEDIUM RED CLOVER FOR SEED AND HAY PRODUCTION

1960 ◽  
Vol 40 (1) ◽  
pp. 21-28 ◽  
Author(s):  
J. E. Winch ◽  
W. E. Tossell
Keyword(s):  
Seed Yield ◽  
Seed Weight ◽  
Red Clover ◽  
Seedling Vigour ◽  
Early Seedling ◽  
Clover Seed ◽  
Seed Yields ◽  
Crop Seed

Higher seed yields of Redon red clover were produced from the aftermath following an early hay crop than from the first crop itself. Red clover-timothy mixtures produced more hay in June and more seed from the aftermath than did pure stands of red clover or red clover-bromegrass mixtures. Seeding rates of 3, 6, 9 and 12 lb. per acre had no effect on red clover seed yield but did affect hay yield. With 2 lb. of timothy, no increase in hay yield was obtained with red clover seeding rates above 6 lb. per acre.Red clover alone produced more seed per acre than red clover-timothy or red clover-brome mixtures when seed was harvested from the first crop. First-crop seed was higher in seed weight than second-crop seed and this was reflected in increased early seedling vigour.

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