In this article we will discuss about the pollen-expressed and pollen specific genes. It is recognized that there are two different sets of genes required for pollen development, one set for the development of pollen grains prior to anthesis, and the other for pollen germination and tube growth. Several reports are accessible aimed at examining the genes expressed during pollen [...]
In this article we will discuss about:- 1. Pollen Wall Adaptations 2. Harmomegathic Adaptation 3. Adaptation to Habitat 4. Adaptation to Mode of Pollination The Sporoderm structure, its chemical constituents and the diverse aperture types of pollen grains, has possibly developed as a need to adaptation in response to their respective habitats and mode of pollination. It has been seen [...]
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 [...]