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!
Sporophytic Incompatibility
The recognition and rejection reactions in a SSI system occur on the stigma surface, placing barriers for pollen germination or penetration of pollen tube into the stigma. Thus the pollen grains either fail to germinate or the small tube they put out is inhibited by callose deposition at the tip. The papillae at the stigma also develop a lenticular callose plug within 10 min after pollination. Infact, in incompatible cases, inhibition of varying degrees operates at every level starting from pollen adhesion, hydration, germination and tube entry into the stigma. In some plants stigma is covered with a cuticular layer such that the incompatible pollen tube fails to penetrate.
Various studies have proved the necessity of enzyme cutinase in eroding the cuticle. This enzyme is activated only by the compatible cases. Incompatible stigmas may lack copious exudate, but dry stigmas have a hydrated layer called pellicle over the cuticle. This pellicle consists of a lipid layer where a mosaic of proteins floats. The pellicle probably originates by the protrusion on the surface of the papillae through discontinuities in the cuticle. As soon as pollen is received by the stigmatic surface the papillate cells exude moisture. The incompatibility is the result of interaction between protein fractions of exine and stigma.
Explain the Laminar Flow Hood - Biological Safety Cabinet? It illustrates the laminar flow hood. As you can see, this biological safety cabinet contains HEPA (high efficiency p
Write a short note on muscular system? The muscular system provides mobility and support to the body. There are three types of muscle tissue: skeletal, smooth, and cardiac. Th
What bacterial cell structures are used to carry the genes intended for genetic engineering? The cells structures in bacteria which carry genes intended for genetic engineering
Q. Explain about Non-Nutritive Sweeteners? Non-Nutritive Sweeteners: These are characterized by an intense sweet taste. They are needed in small quantities and do not make any
FUNCTIONAL L Y POLYSACCHARIDES ARE OF THREE TYPES - Storage, Structural, Mucopolysaccharides Storag e polysaccharides function as reserve food which can be hydrolyzed
Q. What are the main biological functions of water? Water is the basic solvent for chemical reactions of living beings; it is the main means of substance transportation in the
HlSTORY OF PSYCHIATRY: The earliest treatment of mental disorders was practiced by stone age cave dwellers. For certain mental disorders, the early Shaman or medicine man, t
What is the meaning of Visuoperceptive disorders It relates to the way in which brain damage impairs people's ability to adapt to the visual world and the concepts used to trea
Nature of neuropsychological tests Neuropsychological tests are aids in the neuropsychological examination. The tests calculates specified psychological processes including the
Name the Foods to avoid in soft diet include: Fried foods and nuts, rich pastries and desserts, Raw vegetables, Heavily spiced foods, Gas-forming vegetables, S
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