13 Control of Plant Development I

13 Control of Plant Development I - Lecture 13: Control of...

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Lecture 13: Control of Plant Development Apr.19.07
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Factors controlling plant growth Two types of factor control growth and development Endogenous factors Exogenous factors
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Endogenous factors Hormones: from Greek horman - "to set in motion" is a chemical messenger from one cell (or group of cells) to another. Plant hormones: phytohormone . Auxin Cytokinins Ethylene Abscisic Acid Gibberellins Jasmonic Acid Brassinosteroids
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Auxin In 1926 Frits Went discovered this hormone and named it Auxin Auxin from Greek auxein meaning To increase
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Why is Auxin referred to as IAA?
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IAA is the principal natural occurring auxin But there are also synthetic auxins 1 2 Herbicide Induction of adventitious roots in cuttings & reduction in fruit drop
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Site of auxin biosynthesis Primarily in leaf primordia Young leaves Developing seeds Auxin Transport Polarly (Unidirectional) Nonpolarly
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Auxin Transport Polar transport: Is always Basipetal (towards the base): ± From shoot tips and leaves downwards in the stem, via vascular parenchyma cells ± From root tips towards base of the root (root-shoot junction) Velocity= 5-20/cm/h Auxin reach root tip in the sieve tubes non-polarly at much faster rate than the polar movement. Non-Polar transport:
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Auxin Function Apical dominance Tropic responses Differentiation of vascular tissue Promotion of cambial activity Induction of adventitious roots on cuttings Inhibition of fruit and leaf abscission Promotion of fruit development
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Auxin Function Tropic responses Darwin’s experiment
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+ A u x i n Fruit formation by Auxin treatment
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This note was uploaded on 12/04/2010 for the course AGRONOMY Bis1c taught by Professor Brycebattisti during the Fall '10 term at UC Davis.

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13 Control of Plant Development I - Lecture 13: Control of...

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