Pollinator Sharing and Seed Set of Stellaria pubera: Competition for Pollination

Ecology ◽  
1985 ◽  
Vol 66 (2) ◽  
pp. 544-553 ◽  
Author(s):  
Diane R. Campbell
Keyword(s):  
Seed Set ◽  
Competition For Pollination ◽  
Pollinator Sharing

Effect of coflowering Mimulus ringens on phenotypic selection on floral traits of gynodioecious Lobelia siphilitica

Botany ◽  
2013 ◽  
Vol 91 (11) ◽  
pp. 745-751 ◽  
Author(s):  
Erica Wassink ◽  
Christina M. Caruso
Keyword(s):  
Seed Set ◽  
Flower Colour ◽  
Phenotypic Selection ◽  
Character Displacement ◽  
Floral Traits ◽  
Competition For Pollination ◽  
Mimulus Ringens ◽  
Potential Competitor ◽  
Selection For ◽  
Presence And Absence

Although interspecific competition for pollination is hypothesized to result in divergence in floral traits (i.e., character displacement), few studies have tested whether selection on these traits differs in the presence and absence of a competitor for pollination. We measured phenotypic selection on floral traits of Lobelia siphilitica L. growing in the presence and absence of Mimulus ringens L., a potential competitor for pollination. Because L. siphilitica is gynodioecious, we estimated selection separately for female and hermaphrodite plants. The presence of M. ringens did not decrease seed set of L. siphilitica. However, the presence of M. ringens did affect selection on daily display size of female L. siphilitica; there was significant selection for smaller daily displays in the absence of M. ringens, but nonsignificant selection for larger displays in the presence of M. ringens. In addition, selection on flower colour did not differ in the presence and absence of M. ringens, but did differ between female and hermaphrodite L. siphilitica. Consequently, our results suggest that the evolution of floral traits in L. siphilitica, but not the evolution of sexual dimorphism in these traits, can be affected by interactions for pollination with M. ringens.

Effect of introduced Euphorbia esula on the pollination of Viola pedatifida

Botany ◽  
2009 ◽  
Vol 87 (3) ◽  
pp. 283-292 ◽  
Author(s):  
B. R. Montgomery
Keyword(s):  
Invasive Plant ◽  
Fruit Set ◽  
Seed Set ◽  
Euphorbia Esula ◽  
Native Plant ◽  
Pollination Success ◽  
Heterospecific Pollen ◽  
Competition For Pollination ◽  
Introduced Plants ◽  
Pollen Receipt

Introduced plants may compete for pollination with native plants, resulting in reduced fruit or seed set. In this study, I use several techniques to assess whether the invasive plant Euphorbia esula  L. (leafy spurge, Euphorbiaceae) reduces the pollination success of chasmogamous flowers of the native plant Viola pedatifida G. Don (prairie violet, Violaceae), which has chasmogamous and cleistogamous flowers. Euphorbia pollen was found on most Viola stigmas, suggesting the potential for competition. Additionally, application of Euphorbia pollen to Viola stigmas prior to conspecific pollen reduced seed set. However, natural receipt of Euphorbia and other heterospecific pollen was not associated with decreased fruit or seed set. In the field, fruit set was higher for Viola in sites with Euphorbia despite increased Euphorbia pollen receipt, and seed set did not vary with the presence of Euphorbia. However, there was no significant interaction between the presence of Euphorbia and flower type (cleistogamous or chasmogamous), suggesting that increased fruit set near Euphorbia is unrelated to pollination. This study suggests that Viola and Euphorbia interact through shared pollinators, but there is no evidence that competition for pollination with Euphorbia reduces Viola’s fecundity or results in increased reliance on cleistogamous flowers.

Competition for pollination: effects of pollen of an invasive plant on seed set of a native congener

Oecologia ◽  
2001 ◽  
Vol 129 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Beverly J. Brown ◽  
Randall J. Mitchell
Keyword(s):  
Invasive Plant ◽  
Seed Set ◽  
Competition For Pollination

BEHAVIOUR AND EFFECTIVENESS OF BEES IN POLLINATING LEGUMES

1974 ◽  
pp. 105-110
Author(s):  
I.W. Forster
Keyword(s):  
White Clover ◽  
Seed Set ◽  
Red Clover ◽  
Potential Maximum ◽  
Open Fields

One honeybee or bumblebee working on each square metre of white clover or red clover gave adequate pollination. This could be obtained with one hive of honeybees to each three hectares of flowering clover. Lucerne seeding averaged only 10% of the potential maximum in open fields with honey- or bumblebees. In cages where honeybees were forced to gather pollen, this was raised to 30% but it was not possible to increase seed set significantly in the fields.

Hand-Pollination ofCardamine californicaImproves Seed Set

2006 ◽  
Vol 7 (3) ◽  
pp. 248-252 ◽  
Author(s):  
Kazuki Ariyoshi ◽  
Emily Magnaghi ◽  
Mark Frey
Keyword(s):  
Seed Set ◽  
Hand Pollination

DETERMINATION OF AFTER-RIPENING PERIOD AND HORMONAL RESPONSE OF OROBANCHE SOLMSII C.D. CLARKE SEEDS

1970 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Bista ◽  
G. B. Khattri ◽  
B. D. Acharya ◽  
S. C. Srivastava
Keyword(s):  
Growth Hormone ◽  
Seed Germination ◽  
Key Words ◽  
Incubation Period ◽  
Seed Set ◽  
Summer Season ◽  
Conditioning Period ◽  
Root Parasite ◽  
One Year

To find out the ability of Orobanche seeds to germinate immediately after seed set, seeds were germinated periodically at an interval of three months for one year in GR24. Some Orobanche seeds were capable of germination immediately after seed set but most required about nine months as after ripening or incubation period to be able to germinate. The phenomenon of after ripening in Orobanche seeds could be taken as an ecological measure to dormant over following unfavorable wet summer season. The growth hormone studies on Orobanche seed germination have shown that GA3 at a concentration of 100 ppm substantially enhanced seed germination when applied during pre-conditioning period. NAA showed some stimulatory effect at 0.5 - 1.0 ppm when applied during post-conditioning period but the hormone if applied during pre-conditioning period inhibited the germination. Kinetin failed to stimulate the germination at all the concentrations tested. Key words: Germination, root-parasite, hormone. Ecoprint Vol.11(1) 2004.

Study on floral traits and seed setting in parental lines of hybrid rice during early ahu and kharif seasons

2018 ◽  
Vol 78 (3) ◽  
Author(s):  
Aradhana Phukan ◽  
P. K. Barua ◽  
D. Sarma ◽  
S. D. Deka
Keyword(s):  
Seed Set ◽  
Flag Leaf ◽  
Pollen Dispersal ◽  
Pollen Sterility ◽  
Leaf Length ◽  
Floral Traits ◽  
Opening Angle ◽  
Leaf Angle ◽  
Seed Setting ◽  
Parental Lines

Two CMS lines, IR 58025A and IR 68888A along with their maintainers and two fertility restorers, LuitR and IR 36R, were evaluated for flower and plant characters during early ahu (February-June) and kharif (July-November) seasons. IR 58025A showed longer stigmata and styles, and higher spikelet Length/Breadth (L/B) ratio while IR 68888A showed broader stigmata and wider glume opening angle in both the seasons. IR 68888A also exhibited higher pollen sterility during early ahu. IR 36R was characterized with broad anthers. LuitR showed longer and broader anthers with more pollen than others. Plant height, flag leaf length, flag leaf width and area were higher in IR 36R. Panicle exsertion was complete in pollen parents whereas it was 78-80% in CMS lines. The widest flag leaf angle was found in IR 58025B during early Ahu and in IR 36R during kharif. Kharif season was more favourable for growth of the plants with higher seed set percentage while floral traits of the CMS lines were better expressed in early Ahu. Manipulation of the seeding sequence of the parental lines in early Ahu is warranted for better seed set provided the seed crop escapes heavy premonsoon showers during reproductive stage. IR 68888A/LuitR was a good combination for pollen dispersal and seed setting.

Classification and Seed Set of Varied Embryo Sacs of Autotetraploid Rice*

2010 ◽  
Vol 2009 (1) ◽  
pp. 21-27
Author(s):  
Wenbo LONG ◽  
Shengbin TU ◽  
Li LUAN ◽  
Xing WANG ◽  
Fanlun KONG ◽  
...  
Keyword(s):  
Seed Set ◽  
Autotetraploid Rice

Effect of Size of Seed Set on Yield and on Certain Other Characters in Potatoes 1

1928 ◽  
Vol 20 (7) ◽  
pp. 710-721 ◽  
Author(s):  
D. C. Tingey ◽  
George Stewart
Keyword(s):  
Seed Set

Influences of Time of Day and Silk Treatment on Seed Set in Maize 1

Crop Science ◽  
1966 ◽  
Vol 6 (2) ◽  
pp. 216-218 ◽  
Author(s):  
Arnel R. Hallauer ◽  
J. H. Sears
Keyword(s):  
Seed Set ◽  
Time Of Day
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