Lecture 9 plant structure, growth, hormones posted

Lecture 9 plant structure, growth, hormones posted - Auxin...

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BIO 311D LECTURE 9 Plant structure, growth and hormones
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Hierarchy of organs, tissues, and cells Nutrients Roots, stems, and leaves plants
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roots
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prop roots
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storage roots
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Aerial roots
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Buttress roots
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Pneumatophores
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The leaf
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Plant organ tissues
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WATER-CONDUCTING CELLS OF THE XYLEM Vessel Tracheids 100 μ m Tracheids and vessels Vessel element Vessel elements with partially perforated end walls Pits Tracheids SUGAR-CONDUCTING CELLS OF THE PHLOEM Companion cell Sieve-tube member Sieve-tube members: longitudinal view Sieve plate Nucleus Cytoplasm Companion cell 30 μ m 15 μ m
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Plant responses to signals
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Hormone Function Auxin cell elongation, apical dominance (with cytokinins), fruit development, leaf abscission (with ethylene) Cytokinins cell division and growth, apical dominance (with auxin) Gibberellins stem elongation, fruit development, seed germination Abscisic acid seed dormancy, drought tolerance Ethylene fruit ripening, stress, leaf abscission (with auxin)
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Plant life Growth Morphogenesis Differentiation Phase changes Senescence
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Growth Cell division - cytokinins Cell expansion ( auxins, brassinosteroids )
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Plane and symmetry of cell division
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Unformatted text preview: Auxin Apical dominance - cytokinins , auxin Stem elongation- Gibberellins Morphogenesis and pattern formation Positional information- Polarity Homeotic genes Differentiation Positional information Phase changes Leaves produced by adult phase of apical meristem Leaves produced by juvenile phase of apical meristem Flower formation Fruit Development of fruit -Auxin, gibberellins Ripening of fruit - Ethylene Seed formation and development Abscisic acid- Seed dormancy Gibberellins- Germination Plant stresses Drought tolerance abscisic acid, ethylene Other stresses: flooding, mechanical pressure, injury, and infection - Ethylene Aging, senescence Programmed destruction Ethylene Slowing down of aging -Cytokinins Leaf abscission ratio of auxin to ethylene Other external signals Photomorphogenesis Movie Movie Phototropism Circadian rhythms Movie Photoperiodism Gravitropism Thigmomorphogenesis Thigmotropism Heat and cold Herbivory and plant responses...
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Lecture 9 plant structure, growth, hormones posted - Auxin...

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