The following points highlight the nine main chemical constituents of pollen. The chemical constituents are: 1. Major Metabolites 2. Carbohydrates 3. Mineral Content 4. Callose 5. Organic Acids 6. Amino Acids 7. Pigments 8. Vitamins 9. Hormones and Steroids. Chemical Constituent # 1. Major Metabolites: The metabolites like carbohydrates, proteins and lipids vary considerably in pollen due to (a) the [...]
In this article we will discuss about the palynotaxonomy of monocots and dicots. Palynotaxonomy of Monocots: Monocotyledoneae: Pandanales: The pollen grains are monoporate to monosulcate. Typha latifolia (Typhaceae) grains are in tetragonal tetrads, other species of Typha show monads, monoporate; exine granulate to reticulate. In Pandanaceae the grains are monoporate to monosulcate; exine psilate to echinate. In Sparganiaceae, grains are [...]
In this article we will discuss about the evolutionary trends among pollen grains based on palynotaxonomical works. Primarily the aperture is proximal in position in all the taxa of plants, and a change from proximal to distal has been conditioned by physiological and ecological needs that arose in the wake of the origin of new plant taxa. The bryophytes and [...]