Morphological characteristics of pollen grains have been categorised into different groups: 1. Pollen Units 2. Polarity 3. Symmetry 4. Shape 5. Size 6. Apertures 7. Sub-Divisions of the Pollen Surface 8. Sporoderm Stratification 9. Exine Ornamentation 10. 'LO' Analysis. Characteristic # 1. Pollen Units: The pollen grains are produced within the anther of the flower. Pollen mother cells originate from [...]
In this article we will discuss about the events in pollen-pistil interaction with its significance. Pollen-Pistil Interaction: Pollen grains are deposited on the stigma either due to closeness of the anthers to the stigma or by pollinating agents (biotic or abiotic). This unique feature brings about pollen-pistil interaction between the male gametophyte, the pollen grains, with the massive sporophytic tissue. [...]
In this article we will discuss about aeropalynological survey in India and in abroad. 1. Aeropalynological Survey In Abroad: Systematic aeropalynological survey is carried out in various parts of the world. A list of scientists is given below (Table 10.3) who extensively surveyed the airborne allergic pollen in atmosphere. The distributional pattern of the atmospheric pollen grains with their peak [...]