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

Define the disease - marcus gunn pupil, Define the disease - Marcus Gunn Pu...

Define the disease - Marcus Gunn Pupil (RAPD) Relative Afferent Pupillary Defect occurs in a pupil of an eye that is blirld from optic nerve disease. When light is shifted to t

Defects in human development, Defects in Human Development 1) For inst...

Defects in Human Development 1) For instance, when a pregnant woman drinks alcohol her embryo is exposed to similar concentration of alcohol as is in her blood. The alcohol ma

Constrictive pericarditis-pericardial diseases, Constrictive Pericarditis :...

Constrictive Pericarditis :  It is usually the end stage of inflammatory process involving pericardium. In developing world, infection with mycobacterium tuberculosis is still com

Chemical bonding, Chemical bonding : The present matter of earth contains ...

Chemical bonding : The present matter of earth contains atoms bound in groups of two or more called molecules. Their binding capacity is called chemical reactivity; It depends upo

Explain about the infantile beriberi, Explain about the Infantile beriberi?...

Explain about the Infantile beriberi? Infantile beriberi is commonly seen in many South-East Asian countries where the diets consist mostly of "polished rice" and are deficient

Describe the term - intellectual processes scales, Describe the term - Inte...

Describe the term - Intellectual Processes scales The 269 items are divided into 11 content scales, each of which may be administered individually. Since these scales contain v

High energy fixation - nitrogen fixation, High energy fixation - Nitrogen F...

High energy fixation - Nitrogen Fixation Through cosmic radiations, lightning, volcanic activity and meteorite trails which provide the high energy needed to combine atmospher

Ribosome in the translation of one mrna molecule, Q. How many of the same p...

Q. How many of the same proteins are made at the same time by each ribosome in the translation of one mRNA molecule? How does successive protein production occur in translation?

What is cyclosis, What is cyclosis? Cyclosis is a type of internal cell...

What is cyclosis? Cyclosis is a type of internal cell movement in which an oriented flow of circulating material is formed and maintained in the cytoplasm by the action of micr

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