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!
Abscission - Effects of Plant Growth Regulators
Abscission of leaves and fruit is one of the more obvious characteristics of senescence. Leaves do not fall simply because they are dead. A zone of cell division, the abscission zone, develops near the base of the leaf so that numerous cross walls form at right angles to the long axis of the petiole. Then pectinases and cellulases are induced in these cells of the abscission zone. These dissolve the lamellae of the cross walls of these cells, so that the petiole breaks off, The vascular connections break and usually become plugged by the formation of tyloses (deposits of gummy substances) and layers of corky cells.
Thus, at least two important events are involved in abscission: cell division and the induction of hydrolases. Both of these are processes of active metabolism and must therefore, be a programmed part of the development of the plant. Causes of abscission involve several interlocking events. It seems possible that certain growth-inhibiting substances may be involved. ABA clearly stimulates abscission in cotton petiole explants, as does GA. Addition of auxin to the petiole or blade of a senescing leaf prevents the formation of the abscission layer, and thus inhibits abscission.
Q. Fluids requirement in ulcerative colitis? Fluids: A liberal intake of fluid should be given to prevent dehydration. The passage of at least 1200 ml of urine indicates that a
Brain Brain is a part of central nervous system which lies in the skull. Source: Sears and Windwood, Anatomy and Physiology for Nurses The different parts of the bra
Q. What is an instance of negative feedback of the homeostatic regulation? Negative feedback happens when the response to a given action generates an effect that inhibits that
gaseous exchange in man
A healthy, primiparous (first-time) mother delivered a healthy infant several hours ago, but the mother has experienced postpartum hemorrhage. Which of the following disorders is m
Ontogeny: This is the study of history of an individual. Ontogeny is also known as ontogenesis and morphogenesis. Ontogeny describes the origin or the development of an organism -
Define Nutrition Support in elderly - Parenteral, Enteral and Oral? Under nutrition either due to dietary deficit a due to a medical complication may arise in the elderly. The
DE A T H - It is terminal end of the degeneration changes of old age. Death occurs when vescular system & respiratory system stop working. Failure of nervous system ma
You have identified a protein in a cell that you know that comes from the human body. With respect to that protein you have also determined that it allows sodium ions to go through
Q. Differentiate between sterilization and disinfection? 1) Sterilization is defined as freeing the object or substance from all life of any kind. It is the process by which a
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