Results 211 to 220 of about 4,714,607 (247)
Some of the next articles are maybe not open access.
Plant Systematics and Evolution, 1993
Gynoecium development in taxa of the tribeVanguerieae (Rubiaceae, subfam.Antirheoideae) was studied, using primarily a 2- and a 5-carpellate genus (Keetia andVangueria) as examples. All investigated taxa, characterized by ovaries with a solitary, ± apically inserted, pendulous anatropous ovule per locule/carpel, showed a very similar gynoecium ...
exaly +2 more sources
Gynoecium development in taxa of the tribeVanguerieae (Rubiaceae, subfam.Antirheoideae) was studied, using primarily a 2- and a 5-carpellate genus (Keetia andVangueria) as examples. All investigated taxa, characterized by ovaries with a solitary, ± apically inserted, pendulous anatropous ovule per locule/carpel, showed a very similar gynoecium ...
exaly +2 more sources
Secondary pollen presentation syndromes of the Asterales a phylogenetic perspective
Botanische Jahrbücher Für Systematik, Pflanzengeschichte Und Pflanzengeographie, 2006Claudia Erbar, Peter Leins
exaly +2 more sources
Secondary pollen presentation: More than to increase pollen transfer precision
Journal of Systematics and Evolution, 2021AbstractPollination precision and efficiency have been deemed to be important driving forces in floral evolution. Herkogamy reduction is a main mechanism to increase pollination precision. Secondary pollen presentation (SPP), by which pollen is presented on other floral organs especially pistils, has been widely accepted as a special mechanism to ...
Yuan‐Qing Xu +4 more
openaire +1 more source
Plant Systematics and Evolution Supplementum = Entwicklungsgeschichte Und Systematik Der Pflanzen Supplementum, 1993
exaly +2 more sources
exaly +2 more sources
Secondary Pollen Presentation in Flowering Plants
2020Successful pollen transfer among the compatible conspecifics is an essential attribute of sexual reproduction among flowering plants. The plants maximize their male fitness by improving the efficiency of pollen dispersal to as many conspecifics as possible. The precision with which pollen is carried by biotic vectors is also influenced by the manner in
Chandan Barman +2 more
openaire +1 more source
Secondary Pollen Presentation in Angiosperms and Its Biological Significance
Australian Journal of Botany, 1993Secondary pollen presentation is the developmental relocation of pollen from the anthers onto another floral organ which then functions as the pollen presenting organ for pollination. Nine different types have been identified in sixteen angiosperm families according to which organ is used for presentation, whether the pollen is exposed or concealed ...
GJ Howell, AT Slater, RB Knox
openaire +1 more source
American Journal of Botany, 1993
Cephalanthus occidentalis L. is protandrous and presents pollen secondarily on the stigma surface. Because self‐pollen is present on the stigma, the degree of selling vs. outcrossing in this species will depend on 1) the phenology of pollen presentation and stigma receptivity; 2) whether the species is self‐incompatible; and 3) the rates of self vs ...
Fiona M. Imbert, Jennifer H. Richards
openaire +1 more source
Cephalanthus occidentalis L. is protandrous and presents pollen secondarily on the stigma surface. Because self‐pollen is present on the stigma, the degree of selling vs. outcrossing in this species will depend on 1) the phenology of pollen presentation and stigma receptivity; 2) whether the species is self‐incompatible; and 3) the rates of self vs ...
Fiona M. Imbert, Jennifer H. Richards
openaire +1 more source
REGULATED POLLEN ISSUE IN ISOTOMA, CAMPANULACEAE, AND EVOLUTION OF SECONDARY POLLEN PRESENTATION
Acta Botanica Neerlandica, 1983SUMMARY The floral characteristics (white, salverform, nocturnal sweet fragrance emission) of Isotoma petraea F. Muell. are indicative for pollination by night flying Lepidoptera. The pollen issue is regulated by a valve which has to be operated by the visitor. The valve consists of two connected, dead papillae.
openaire +1 more source
Plant Biology, 1999
Abstract: In the genus Spigelia (Spigeliaceae, Gentianales) we report for the first time the phenomenon of secondary pollen presentation. In Spigelia anthelmia, S. marilandica, and S. splen‐dens a deposition mechanism as found in some members of the Rubiaceae could be observed in living material. In Spigelia longi‐flora, S. sellowiana, and S. speciosa
Claudia Erbar, P. Leins
openaire +1 more source
Abstract: In the genus Spigelia (Spigeliaceae, Gentianales) we report for the first time the phenomenon of secondary pollen presentation. In Spigelia anthelmia, S. marilandica, and S. splen‐dens a deposition mechanism as found in some members of the Rubiaceae could be observed in living material. In Spigelia longi‐flora, S. sellowiana, and S. speciosa
Claudia Erbar, P. Leins
openaire +1 more source
On the Mechanisms of Secondary Pollen Presentation in the Campanulales‐Asterales‐Complex1
Botanica Acta, 1990AbstractFamilies of the Campanulales‐Asterales‐complex are characterized by special mechanisms for secondary pollen presentation: pump mechanism, brushing mechanism, deposition mechanism, cup mechanism and combination of cup mechanism with brushing mechanism.
P. Leins, Claudia Erbar
openaire +1 more source