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

Carbohydrates, Carbohydrate - contains Carbon , Hydrogen , and Oxygen ...

Carbohydrate - contains Carbon , Hydrogen , and Oxygen with a general formula of C x (H 2 O) y Simple sugars à monosaccharides Oligosaccharide à sugars containing

Explain third mitotic period, Q. What are the major events of the third mit...

Q. What are the major events of the third mitotic period? The third mitotic period is anaphase. In anaphase the following events occur breaking and duplication of centromeres w

Bio-security in relation to diseases, B i o-security in relation to disea...

B i o-security in relation to diseases Bio-security is a strategic and integrated approach encompassing policy and regulatory frameworks to analyze and manage risks in the se

Insulin binding to insulin receptors in the plasma membrane, Insulin bindin...

Insulin binding to insulin receptors in the plasma membrane of a A. liver cell will lead to an increase in the intracellular amounts of cAMP in the liver cell. B. beta-islet

Explain the advantage of internal fertilization, For animals, what is the a...

For animals, what is the advantage of internal fertilization and what type of species utilize it?

Plants - slow moving waters, Plants - Slow Moving Waters Plant life is...

Plants - Slow Moving Waters Plant life is abundant in this habitat and includes rooted vascular plants such as pond weeds and grasses, firmly attached aquatic mosses and multi

In which chloroplast structure are chlorophyll found, In which chloroplast ...

In which chloroplast structure are chlorophyll molecules found? Chlorophyll molecules are placed in an organized manner in order to increase the exposure to light on the thylak

Determine the goal of a bcc programme, Determine the Goal of a BCC Programm...

Determine the Goal of a BCC Programme The overall goal of BCC programs for diabetes mellitus is to promote behaviors that control blood sugar and prevent complications. Thes

Explain role of mineral salt in creation of electric tension, What is the r...

What is the role of mineral salts in the creation of electric tension (voltage) at the cellular level? The electric activity of the cell, for instance, in neurons, depends on

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