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 [...]
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 [...]
The pollen grains are covered with two concentric wall layers, the outer exine and the inner intine. The stratification of pollen wall is primarily based upon optical microscopy of whole as well as sectioned grains and upon staining reactions of the strata. Recently such stratification is complemented by the biochemical analysis of the various pollen wall layers. The intine is [...]