LO-analysis is a means to elucidate the details of sexine pattern on the basis of light microscopic observations of a pollen grain and spore at different adjustments of the microscope. The ultra thin section (0.1-0.5 micron thick) and optical section of a pollen grain provide details of sexine. The term optical section refers to the view of a pollen grain [...]
In this article we will discuss about the aperture found in the pollen and spore wall of plants. It is a weak, preformed locus on the exine of spore and pollen through which the intra-exinous substance exits and pollen tube emerges during pollen germination. Apertures may be absent from a pollen grain or spore when they are termed as inaperturate/atreme/non-aperturate [...]
The following points highlight the three main types of vegetative shoot apex found in plants. The types are: 1. Monoplex Apex 2. Simplex Apex 3. Duplex Apex. Type # 1. Monoplex Apex: Ex. cryptogamic vascular plants. Continuing meristematic residue occurs in the superficial layer only. It may consist of more than one cell provided a common wall is present between [...]