Pollen biology, Biology

Assignment Help:

Pollen Biology

Fluorescence microscopy coupled with biochemical analysis has helped resolve the differential activity of the enzyme, β-l, 3- glucanase that catalyses the dissolution of callose. The enzyme activity is relatively low during the first meiotic division but reaches its peak at the time of spore release. This sequence of events controlling the enzyme activity is important, as an early dissolution of callose may lead to sterility. Use of autoradiographic and fluorochromatic techniques demonstrated the reduced permeability of the callose wall and the resultant chemical isolation of microspores.

A combination of phase-contrast and fluorescence microscopy also revealed that the callose wall during exins formation serves as a mold or template. Factors that trigger the onset and regulation of meidsis in anther and ovule can be worked out by employing labeled reagents. Biochemical studies through isoenzyme markers have already demonstrated specific stages of meiotic process. There is an increase in the activity of acid phosphatase at zygotene, followed by subsequent decline. At pachytene, marked activation of endonucleases is recorded. Isoperoxidases serve as markers in normal pollen development in Mercurialis annua.


Related Discussions:- Pollen biology

Pluripotent scs:grouping of stem cells, Pluripotent SCs : Characterizing...

Pluripotent SCs : Characterizing more restricted abilities for differentiation.their sources are some celles blastocyst (5-14 days) embroys, so can from over 200 cells types i.e

Optional use values of biodiversity, Q. Optional use values of biodiversity...

Q. Optional use values of biodiversity? Optional values are associated with potential use in the future. Accordingly one opts to conserve biodiversity based on the hope that it

Managing diarrhoea in children, Q. Managing diarrhoea in children? Mana...

Q. Managing diarrhoea in children? Managing diarrhoea in children is of great concern. The guidelines for the same are as follows: 1. The first objective is to rehydrate the

Pvcs during recovery, As the heart rapidly slows during recovery from exerc...

As the heart rapidly slows during recovery from exercise, PVCs commonly occur and usually have no clinical significance. This may be a time when metabolic adjustments in the heart

Example of structural function of organic molecules, Q. What are the few ex...

Q. What are the few examples of the structural function of organic molecules? Organic molecules have a structural function as they are part of cell membranes, organ walls, cyto

Protection of protein meals or bypass protein, Protection of protein meals ...

Protection of protein meals or bypass protein The protein of oil cakes, having higher protein degradability, such as groundnut cake, mustard cake are utilized in the rumen les

Define the precursor of co-enzymes - functions of riboflavin, Define the Pr...

Define the Precursor of co-enzymes - Functions of riboflavin? The major function of riboflavin is to serve as the precursor of the coenzymes FMN and FAD and of the covalently

Lead to protein denaturation, Q. What are some factors that can lead to pro...

Q. What are some factors that can lead to protein denaturation? Protein denaturation can be caused by temperature variation, pH change, changes in the concentration of surround

Plant physiology, detail notes on seed dormancy and seed germination

detail notes on seed dormancy and seed germination

Geothermal energy, It is that energy which lies, embedded within earth's cr...

It is that energy which lies, embedded within earth's crust. In some places heated water comes out through the surface of earth as hot spring or steams. This hot geothermal water o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd