Mechanism of Leaf abscission:
It occurs at the base of the petiole that is internally marked by a different zone of few layers of thin-walled cells arranged transversally across the petiolar base. This region is termed as the abscission layer or abscission zone (fig is as shown below). The cells of the abscission layer are different from each other due to the dissolution of middle lamella and as well the primary cellulose walls beneath the influence of the raised activity of the enzymes pectinase and cellulose. At this phase the petiole remains joined to the stem only by vascular elements and very soon due to its pressure and own weight of wind, is detached from the stem. The broken vascular elements are soon plugged with gums or tyloses.
Figure: A leaf petiole exhibiting the abscission zone
The abscission is controlled by abscisic acid (ABA), a growth regulator synthesized mainly in chloroplasts. This is a general inhibitor of most processes, and the abscission layer forms and hardens beneath its direction.
Latest technology based Biology Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Abscission and Senescence homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Abscission and Senescence, project ideas and tutorials. We provide email based Abscission and Senescence homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Abscission and Senescence. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Abscission and Senescence. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!