Plant responses to Hormones and
Environmental Stimuli
•Responses include
–Developmental transitions
•Dormancy
•Germination
•Flowering
–Growth
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Plant Responses to Hormones and Environmental Stimuli - Botany - Lecture Slides, Slides of Botany and Agronomy
These are the important key points of lecture slides of Botany are:Plant Responses to Hormones and Environmental Stimuli, Developmental Transitions, Environmental Signals, Signal Transduction Pathways, Internal and External Signals, Gene Expression, Interact to Promote, Responses Involving Auxin, Cellular Elongation, Initiation of Leaf Primordia
Typology: Slides
2012/2013
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Plant responses to Hormones and
Environmental Stimuli
- Responses include
- Developmental transitions
- Dormancy
- Germination
- Flowering
- Growth
- Developmental transitions
Hormones & environmental signals
involve signal transduction pathways
Hormones influence gene expression
- Gene expression regulated by - microRNAs - transcription factors
Plant hormones & growth
(abscisic acid)
Hormones interact to promote/inhibit
development
Responses involving auxin
- Phototropism
- Gravitropism
- Cellular elongation
- Initiation of leaf primordia
- Apical dominance
- Root development
- Fruit development
Tropisms
- Permanent, directional growth in response to an external stimulus - Positive tropisms - Negative tropisms
Auxin and cell elongation
Acidified cell walls have increased elasticity
Phototropism research
Phototropin ( NPH1 ) and phototropism -initiates a signal transduction pathway
- nph1 mutants non- phototropic