"Unfolding Nature's Story: The Journey of Leaf Development" II Morphology of Flowering Plants II Free Notes II #biology #botany #basics #developmentalbiology

 DEVELOPMENT OF LEAF

• Leaf is formed Exogenously while lateral roots are endogenous in origin.
• Leaf Primordia is the earliest stage of development of leaf.
• Leaf primordium generally begins as a slight bulge/Ridge on the flank of the SAM
• In Dicots, the SAM is found between the two cotyledons and is the site of leaf initiation.
• In the region of SAM there are ridges that broaden out to form emerging Leaf Primordia. These ridges are also called as Leaf Buttresses alternate in a genetically determined pattern called as Phyllotaxy.
• During the formation of leaf primordia there is change in size and form of ridges that ultimately forms leaf.
• The time between the formation of these successive primordia and during which these changes in form and size occurs is called Plastochron.
• In Monocots shoots typically do not show tip growth or have a shoot apical meristem.
• Instead, stem and leaf growth are driven by mitosis in a loose arrangement of meristematic cells that are scattered throughout a zone called an intercalary meristem.
• Intercalary meristems are found between the nodes or at the base of leaves.

WATCH OUT COMPLETE VIDEO