Structure, ultrastructure, and histochemistry of the pollen tube pathway in the milkweed Asclepias exaltata L.

@article{Sage2004StructureUA,
  title={Structure, ultrastructure, and histochemistry of the pollen tube pathway in the milkweed Asclepias exaltata L.},
  author={Tammy L. Sage and Elizabeth G. Williams},
  journal={Sexual Plant Reproduction},
  year={2004},
  volume={8},
  pages={257-265}
}
The structure of the gynoecium and pollen tube pathway in unpollinated and pollinated carpels of Asclepias exaltata L. has been characterized. Pollen tubes penetrate a dry-type stigma, grow intercellularly in a core of solid tissue in the upper style, and subsequently traverse a hollow stylar canal to the ovary where they grow across the placental epithelium to the ovule micropyles. The fine structural characteristics of transmitting cells of the solid style, stylar canal, and placental… Expand

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References

SHOWING 1-10 OF 38 REFERENCES
A structural investigation of the ovule in sugar beet, Beta vulgaris: The micropylar nucellus
TLDR
At the mature stage of ovule development the micropylar part of the crassinucellate nucellus in sugar beet, Beta vulgaris has been investigated by light and electron microscopy and it is discussed whether mitochondrial conversion of ACC to ethylene in these cells might be involved in pre- and postfertilization processes. Expand
A Dynamic Role for the Stylar Matrix in Pollen Tube Extension
TLDR
Sexual reproduction in flowering plants occurs by the processes of pollination and fertilization through the transfer of the pollen grain to the stigma, its adhesion, hydration, and production of a pollen tube. Expand
THE POLLEN‐STIGMA INTERACTION IN THE GRASSES. 7. POLLEN‐TUBE GUIDANCE AND THE REGULATION OF TUBE NUMBER IN ZEA MAYS L.
TLDR
The device maximises the period available for pollen capture and yet provides for the strict regulation of the number of tubes ultimately entering the ovary once pollination has taken place. Expand
The nucellar epidermis and micropyle of Ornithogalum caudatum (Liliaceae) with a review of these structures in other taxa
TLDR
The nucellar epidermis of Ornithogalum caudatum is modified in its micropylar region to form a nu cellar cap which appears to preclude pathogen invasion and prevent desiccation of embryo and endosperm. Expand
A PERIODIC ACID-SCHIFF'S SUBSTANCE RELATED TO THE DIRECTIONAL GROWTH OF POLLEN TUBE INTO EMBRYO SAC IN PASPALUM OVULES'
A B S T R A C T The presence of a periodic acid-Schiff's (PAS) substance at the micropylar portion of the ovules of Paspalum orbiculare and three other species of Paspalum has been revealed byExpand
Chemotropic responses by pearl millet pollen tubes
TLDR
Results which apparently suggest the presence of at least three different potential chemotropic factors in pearl millet ovaries are discussed in relation to angiosperm chemotropism in general and the difficulties involved in the search for possible in vivo chemotropic Factors. Expand
Unusual transfer cells in the epithelium of the nectaries ofAsclepias curassavica L.
SummaryThe secretory cells of the nectaries ofAsclepias curassavica form a glandular epithelium in the inner parts of the stigmatic chambers. They resemble transfer cells in having many infoldings ofExpand
Micropylar exudate in Gasteria (Aloaceae) and its possible function in pollen tube growth.
TLDR
The micropylar exudate of Gasteria verrucosa (Mill.) H. Duval was studied using light and electron microscopic techniques and an interaction between the pollen tube and the micropyle has been proposed. Expand
Ontogeny, function and evolution of extreme floral construction inMonimiaceae
TLDR
In at least 4 genera of theMonimiaceae (Tambourissa, Wilkiea, Kibara, Hennecartia) extremely specialized flowers with a hyperstigma occur, i.e. a secretory zone in the narrow entrance of the floral cup, which produces a transmitting medium for pollen tubes continuous from the mouth of the flower cup to the ovules. Expand
The Role of Nectar in the Germination of Pollen in Asclepias syriaca L.
TLDR
The nectary of Asclepias syriaca is in the stigmatic chamber and nectar flows from there by a capillary system to the nectar reservoirs (cuculli) which are the reward taken by insect pollinators. Expand
...
1
2
3
4
...