internal growth factors

what is a hormone

controls aspects of growth and development, under genetic control, transported to a part of the plant where they have specific effects

what does auxin do

tells a plant where and how to grow

what is auxin involved with

growth, cell enlargement, and cell elongation

what is auxin synthesized from

indole

flow of auxin

basipetal direction, shoot to root movement

are mutations possible for IAA (auxin)

no because if the organism has a mutation it just dies so it doesn’t pass on to next generation

movement of auxin

produced in shoot apical tissues by bulk flow in phloem, then reaches sink tissues in the tips of primary and lateral roots

transport of auxin

fountain model of auxin transport in the root, auxin is unloaded from the phloem and transported throughout root tissues through polar auxin transport

what are the two ways auxin plays a role in differentiation in vascular tissue

cell specialization and gene regulation

auxin cell specialization of vascular tissue

promotes the development of certain cells into xylem or phloem

auxin gene regulation of vascular tissue

regulates genes involved in cell division and specialization, guiding cells toward becoming vascular tissue

xylem regeneration

promoted by auxin IAA in wound healing

how are the two ways auxin plays a role in induction and arrangement of leaves

initiation and growth and shape

auxin initiation

local increase in auxin concentration at the shoot apical meristem is a key signal that triggers the formation of a new leaf primordium

auxin growth and shape

auxin influences the formation of the leaf blade and other structures like serrations, contributing to the overall shape of the leaf

what promotes apical dominance

auxin