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

Biochemestry, what are peptides and poly peptides hormones

what are peptides and poly peptides hormones

Find the biosynthesis of acetylcholine, On the overall process of cell-to-c...

On the overall process of cell-to-cell communication within the nervous system, what role does the Ca2+ play in the synapse? A) contributes in the biosynthesis of acetylcholine B)

Define estimation of blood thiamin levels - thiamin status, Define Estimati...

Define Estimation of Blood Thiamin Levels - Thiamin Status? The levels of free thiamin and its phosphoesters in whole blood and erythrocytes are measured using high- performanc

BIN Report, Ask plquestion #Minimum 100 words accepted#

Ask plquestion #Minimum 100 words accepted#

Pharmacognosy, Pharmacognosy :  This is the study of medicinal plants. Phar...

Pharmacognosy :  This is the study of medicinal plants. Pharmacognosy is a kind of the study of medicines which are derived from natural sources. The American Society of Pharmacogn

Explain the metabolism - zinc, Explain the Metabolism - Zinc? Zinc has ...

Explain the Metabolism - Zinc? Zinc has been found to play an important biological role in our body. Zinc ions can be chelated and precipitated by a number of chelating agents

Express the answer as a whole number, Two true-breeding pea plants were cro...

Two true-breeding pea plants were crossed. One parent is round, terminal, and violet, constricted, while the other expresses the respective contrasting phenotypes of wrinkled, axia

What proportion of children with down syndrome, What proportion of children...

What proportion of children with Down syndrome do you expect when women with Down syndrome have children with men who have 46 chromosomes justify your answer?

Oxygenator- equipment of cardio pulmonary bypass , Oxygenator :   They serv...

Oxygenator :   They serve the function of lungs during extra corporeal circulation (ECC) - Oxygenation, removal of carbon dioxide and transport of gaseous anaesthetic agents:*The 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