Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Define Descending type of paper chromatography? In descending chromatography, the movement or flow of mobile phase is in downward direction. In this technique the solvent is ke
Asexual reproduction in fungi Fungi reproduce asexually by means of sporulation and fragmentation. Fragmentation : This is a type of asexual reproduction in fungi whi
When an individual is exposed to foreign serum antigen then a combination of symptoms are produced which is known as serum sickness.
Describe Paradoxical and Reverse Split S in second heart sound? Sequence of seminar valve closure reversed i.e. P, proceeds A. A reversed split is nearly always due to delayed
Explain Chemical Formulas and Reactions? Chemical Formulas and Reactions : Molecules formed by the chemical bonding of atoms are described by chemical formulas. If energy
how can i read role od fungi as saprophyte?
Head stream of Highland brook zone This is formed by a number of small streams, which originate from a marsh, a spring or a glacier. This is a small shallow zone with an irreg
Radioactive Labelling Radioactive labelling method has been effectively applied on the chick blastoderm. The method includes labelling one embryo (donor) and grafting a part
Is gene a triplet of consecutive DNA nucleotides A gene isn't a triplet of DNA nucleotides with their respective nitrogen-containing bases, like CGT or AAG. The nucleotide trip
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd