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

What is chromatography, Question 1 What is chromatography? List various me...

Question 1 What is chromatography? List various methods of chromatography. Add a note on applications of chromatography in diagnosis Question 2 Discuss the applications of co

Define freeze concentration, Define Freeze Concentration? This process ...

Define Freeze Concentration? This process has been known for many years and has been applied commercially to orange juice. However, high processing costs due largely to losses

Situation in which the mistakes holds in dna replication, Q. Mistakes may h...

Q. Mistakes may happen during each copying process. The same is true for the DNA replication. Are there correction systems in cells that try to mend those mistakes? Under which sit

Major conventional symbols & signs used in genetic family, What are the maj...

What are the major conventional symbols and signs used in genetic family trees? In the genetic family trees the male sex is usually represented by a square and the female by a

Aschelminthes, General characters of aschelminthes

General characters of aschelminthes

Phylum protozoa, What are some examples of organisms belonging to this phyl...

What are some examples of organisms belonging to this phylum? Please name them.

Corticosteroid, Corticosteroid Anti-inflammatory and immuno suppressiv...

Corticosteroid Anti-inflammatory and immuno suppressive. Route: Oral, parental, dose as prescribed. Side-effects: sodium and fluid retention, potassium and ca

What type of compound is major metabolic waste of porifera, What type of co...

What type of compound is the major metabolic waste of Porifera? Why is it important for the organism to get rid of this compound?

Explain boiling point - properties of solution, Boiling Point There are...

Boiling Point There are certain properties of solutions  which are directly connected with vapour pressure and one of it is boiling point.  You must have observed that water bo

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