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.
Which of the following is a false statement regarding gel electrophoresis? A. An electric current is used in order move DNA fragments by a semi-porous gel. B. Fragments of n
which organism are called primitive and how are they different from the so-called adavnced organisms
Type 1 Diabetes Mellitus occurs when the body's immune system destroys beta cells. Beta cells produce insulin, a hormone that helps to move the glucose contained in food into cells
Bronchial asthma: Bronchial asthma is characterised by bouts of dyspnoea as a result of temporary narrowing of bronchi due to bronchial spasm, mucosal edema and thick secret
Define Principle of Detection of Metanil Yellow? Non-permitted colours like lead chromate, metanil yellow, auramine, rhodamine B are used to brighten the foods especially spice
The active transport of molecules requires an input of metabolic energy and this can be derived either from direct coupling to the hydrolysis of ATP or by coupling to
PEROXISOMES AND GLYOXYSOMES Certain small ovoid unit membrane bound sac like cytoplasmic organelles, resembling lysosomes in size and appearance were isolated from var
what is the basic structure of a virus?
Alterations occurring in fruits and vegetables You may already be aware that fruits and vegetables vary greatly in their chemical composition. Though, some generalizations are
In continuous wave Doppler, the transducer has two Doppler crystals, one to constantly transmit and one to continuously receive. As a result of this continuous mode of tra
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