Viscin threads on pollen of Circaea ×intermedia Ehrh. (Circaeeae: Onagraceae)

Taxon ◽  
2005 ◽  
Vol 54 (1) ◽  
pp. 121-126 ◽  
Author(s):  
John J. Skvarla ◽  
John R. Rowley ◽  
Peter C. Hoch ◽  
William F. Chissoe
Keyword(s):  
Viscin Threads

scholarly journals Pollenkitt and viscin threads: their role in cementing pollen grains

Grana ◽  
1981 ◽  
Vol 20 (3) ◽  
pp. 145-152 ◽  
Author(s):  
Michael Hesse
Keyword(s):  
Pollen Grains ◽  
Viscin Threads

Transfer of material through the microspore exine — from the loculus into the cytoplasm

2003 ◽  
Vol 81 (11) ◽  
pp. 1070-1082 ◽  
Author(s):  
John R Rowley ◽  
John J Skvarla ◽  
Gamal El-Ghazaly
Keyword(s):  
Colloidal Iron ◽  
Great Capacity ◽  
Viscin Threads ◽  
Micro Channels ◽  
Pass Through

Our results and those we review indicate that the exine has a great capacity for modifications that enable nutrients to pass through from the anther loculus to the microspore cytoplasm. Avenues of passage include strands, some of which are viscin threads, from the tapetum to microspores in, for example, Betula, Fuchsia, and Epilobium. Micro channels in Lopezia, Gaura, and Gelsemium extend through the ectexine, endexine, and intine to the cytoplasm. The bulge regions in Epilobium represent portions of the endexine that become very greatly enlarged, forming conducting channels that transport materials into the microspore cytoplasm. Results with tracers such as colloidal iron and lanthanum have also shown that exines of microspores are permeable across areas lacking obvious channels.Key words: Betula, Epilobium, exine, Fuchsia, Gaura, Gelsemium, Lopezia, microchannels, pollen, tapetum, tufts, viscin threads.

VISCIN THREADS, POLLINATION EFFICIENCY AND LOW POLLEN-OVULE RATIOS

1979 ◽  
Vol 66 (8) ◽  
pp. 875-879 ◽  
Author(s):  
Robert William Cruden ◽  
Kenneth G. Jensen
Keyword(s):  
Pollination Efficiency ◽  
Viscin Threads

scholarly journals An exine architecture model for viscin threads

Grana ◽  
1984 ◽  
Vol 23 (2) ◽  
pp. 69-75 ◽  
Author(s):  
Michael Hesse
Keyword(s):  
Architecture Model ◽  
Viscin Threads

scholarly journals Some cytological, ecological and evolutionary aspects of pollination

2014 ◽  
Vol 65 (1-2) ◽  
pp. 11-16 ◽  
Author(s):  
Ettore Pacini ◽  
Gian G. Franchi
Keyword(s):  
Pollen Grains ◽  
Pollen Exine ◽  
Cohesive Forces ◽  
Viscin Threads ◽  
Tapetal Cells ◽  
Different Types ◽  
Pollen Diameter ◽  
Evolutionary Aspects

Different types of pollen dispersing units are described. The pollen of angiosperms may be dispersed in monads, tetrads, polyads, massulae or compact pollinia. The monads and tetrads may form larger clumps of pollen with the aid of the following substances: a) pollenkitt, a product of <em>in situ</em> degeneration of the tapetum; b) tryphine, a product of tapetal extra situm degeneration, found only in <em>Cruciferae</em>; c) elastoviscin, a highly viscous product of the degeneration of a limited number of tapetal cells, found only in certain <em>Orchidaceae</em>; d) viscin threads or sporopollenin filaments arising from the pollen exine. The number of pollen grains composing the clumps depends on pollen diameter and the cohesive forces holding the pollen grains together. The various types of pollen dispersing unit are discussed in relation to the type of pollination and number of ovules per ovary.

Pollination in an understorey vine, Smilax rotundifolia, a threatened plant of the Carolinian forests in Canada

1991 ◽  
Vol 69 (11) ◽  
pp. 2555-2559 ◽  
Author(s):  
Peter G. Kevan ◽  
John D. Ambrose ◽  
James R. Kemp
Keyword(s):  
Key Words ◽  
Threatened Species ◽  
Habitat Management ◽  
Seed Set ◽  
Wind Dispersal ◽  
Viscin Threads ◽  
Floral Form ◽  
Fruit And Seed Set ◽  
Management And Conservation ◽  
Key Words Dioecy

Round-leaved greenbrier, Smilax rotundifolia L. (Liliaceae), is an insect-pollinated, dioecious, understorey vine. Its pollen is linked by viscin threads, effectively preventing wind dispersal. In most sites populations are not sexually reproductive, being unisexual, but do not spread vegetatively. Where both sexes occur, fruits and seeds are produced naturally. Artificial cross-pollinations can enhance the level of fruit and seed set. Understanding the biology of this threatened species is important for habitat management and conservation. Key words: dioecy, greenbrier, viscin, floral form, conservation, pollination.

scholarly journals Pollen morphology of the tribe Phyllodoceae (Ericoideae, Ericaceae) and its taxonomic significance

2014 ◽  
Vol 21 (2) ◽  
pp. 129-137 ◽  
Author(s):  
A.K.M. Golam Sarwar ◽  
Hideki Takahashi
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Morphological Data ◽  
Taxonomic Significance ◽  
Viscin Threads ◽  
Sem Study ◽  
Plant Taxon ◽  
Generic Relationships ◽  
Systematic Importance ◽  
Scanning Electron

Pollen morphology of 13 taxa belonging to 5 genera of the tribe Phyllodoceae (Ericaceae) was examined by means of light and scanning electron microscopy (LM and SEM, respectively), or SEM alone. In Phyllodoceae, 3-colpor(oid)ate, minute to medium, oblate pollen grains are united usually in tetrahedral tetrads. Pollen tetrads are generally characterized by the presence of viscin threads except Elliottia pyroliflora, Epigaea asiatica and Phyllodoce caerulea. The absence of viscin threads might indicate to a secondary loss, since these are present at least in some species within all the genera of Phyllodoceae. The pollen morphological data confirm the infra- and inter-generic relationships as identified by molecular phylogeny of Phyllodoceae and/or vice-versa. Although various palynological characters were found to be taxonomically important at different taxonomic levels, the apocolpial exine sculpture is emerged as one of the most important palynological features of systematic importance. The rugulate apocolpial exine with striate secondary sculpture and a reduced colpus might be apomorphic palynological character states for this tribe and Ericaceae as well. Hitherto, it is the first SEM study of Rhodothamnus pollen.DOI: http://dx.doi.org/10.3329/bjpt.v21i2.21351Bangladesh J. Plant Taxon. 21(2): 129-137, 2014 (December)

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