In this paper, a new foldable structure has been studied and designed drawing inspiration from the structure of a pollen grain of angiosperm. This structure is made by two materials: a more rigid upper part which works only in compression and a less rigid lower part which undergoes tensile ...
MTN1-2 genes encode 5′-methylthioadenosine (MTA) nucleosidase68, and double mutant mtn1-1 mtn2-1 flowers in Arabidopsis have indehiscent anthers and malformed pollen grains69. Double mutants also affected carpels and ovules, although the structures were aberrant but not necessarily non-...
Clarke E, Steer MW (1983) Cytoplasmic structure of germinated and ungerminated pollen grains of Tradescantia virginiana . Caryologia 36:299–305Clark , E., Steer , M. W., 1983: Cytoplasmic structure of germinated and ungerminated pollen grains of Tradescantia paludosa. — Caryologia 36 : 299–...
Lynn L. Hoefert.Fine structure of sperm cells in pollen grains ofBeta[J]. Protoplasma .1969(1-2)HOEFERT, L. L. (1969a). Fine structure of sperm cells in pollen grains of Beta. Protoplasma 68, 237-240.Lynn L. Hoefert. Fine structure of sperm cells in pollen grains ofBeta[J] ...
in coarsely powdered drugs. A characteristic papillose epidermis may sometimes be present on the stigmas of the gynaecium. Characteristic fragments of the anther wall are diagnostic of the presence of flowers. Of first importance is the occurrence, size, shape and wall structure of pollen grains....
A new technique involving precise cross sectioning or slicing of pollen grains at a selected position for examining wall ultrastructure, using a focused ion beam-scanning electron microscope (FIB-SEM), has been explored and promising results have been obtained. The FIB-SEM offers a good technique ...
To avoid a potential bias by heterospecific pollen transport10, an interaction was only scored when an individual nocturnal moth carried three or more pollen grains of that particular plant species. Data analysis We assembled three qualitative (i.e., presence-absence) interaction networks per site:...
Benth. the pollen grains are spherical with cerebroid sculpturing while in the section Cryptanthium Horan. the pollen is ellipsoid with spira-striate sculpturing. All species have a thin coherent exine and an intine consisting of a thick, radially channeled outer layer and a thin, finely ...
Female tissues are able to discriminate between pollen grains, recognizing pollen from the appropriate species while rejecting pollen from unrelated species (or from the same plant in self-incompatible species). This selectivity is accompanied by tremendous diversity in the cell surfaces of male and ...
Elements of the surface coating are glycoprotein and connect with filamentous material within the anther loculus. The gemmae may be assumed to increase in number between the microspore period and pollen grain maturity since their frequency per unit area and the surface area of the grains increase....