Rejection reaction, Biology

Rejection Reaction

For rejection reaction the physiological and biochemical processes are set in the pistil by the recognition reaction specific to the type of pollen that lands on stigma. In contrast to systems where inhibition can occur on stigma itself thus preventing germination of pollen or its entry into style, in GSI system it may occur in style leading to either inhibition of pollen tube growth or its bursting.

The pollen wall and its protein content plays an important role in pollen stigma interaction. Through cytochemical studies it has been observed that the pollen wall is perforated by protoplasmic strands giving the appearance of a living physiological structure playing a very responsible role in the process of interchange between the pollen grain and the substrate. The incorporation of proteinaceous substances in the exine and the intine has been demonstrated by EM studies of the pollen wall during development. A good amount of mobile proteins of the pollen grains is S-gene specific. The recognition proteins of incompatibility are held extra-cellularly in the pollen wall. In GSI plants, these proteins are present in the intine while in SSI plants they occur in the exine.

Posted Date: 1/23/2013 4:54:36 AM | Location : United States







Related Discussions:- Rejection reaction, Assignment Help, Ask Question on Rejection reaction, Get Answer, Expert's Help, Rejection reaction Discussions

Write discussion on Rejection reaction
Your posts are moderated
Related Questions
my homework is asking me to find the four possible gametes for two parents using their genotypes. How do i do that???? would I use the F.O.I.L. method?

Formation of Aqueous  Humour It  is  universally accepted that the aqueous  is  produced  by  the  ciliary processes. Although a great deal of  research has been done on the fo

What are three basic phases of PCR?  Which phase of these three phases is used for analysis for the end-point PCR? Why? Which phase is used for analysis for the quantitative real-t

Why would the O-H bond in C=O-H and the OH bonding with a water molecule be considered weak?

Plant Responses to Light-Dark Cycles Based on their requirement for day length (number of hours of light) for flowering plants have been grouped under three major categories,

You have a neuron with a resting potential of -55 mV, EK of -70 mV, and ENa of 50 mV. You decide to voltage clamp the neuron. Now, draw the membrane current over time. What will th

Q. Besides the liver which is the other adnexal gland of the digestive system that releases substances in the duodenum participating in extracellular digestion? The other adnex

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Sample Outline of Child History Questionnaire Basic identifying data: Child's name Date of birth Date of evaluation Person referring for evaluation Per

Q. Explain the Use of nitrates and nitrites in microorganisms? The use of nitrates and nitrites has been widely used in the curing of meat. The reduction of nitrates by bacteri