Chapter 28 External factors and Plant growth Nastic

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Chapter 28 External factors and Plant growth

Chapter 28 External factors and Plant growth

Nastic Movement • Nastic Movements- plants movement that occur in response to a stimulus

Nastic Movement • Nastic Movements- plants movement that occur in response to a stimulus independent of position of stimulus ( leaves light and dark cycle) • Phototropism- response to light- caused by elongation- under the influence of Auxin • Gravitropism- response to gravity • Thigmotropism- response to touch

External Factors and Plant Growth • Tropism- the growth response involving bending, or curving,

External Factors and Plant Growth • Tropism- the growth response involving bending, or curving, of a plant part toward or away from an external stimulus determines the direction of movement

Went’s experiment- chemical produced by growing tips influences direction of growth

Went’s experiment- chemical produced by growing tips influences direction of growth

What role does the light play in the phototropic response? • Light decreases the

What role does the light play in the phototropic response? • Light decreases the auxin sensitivity of the cells on the lighted side • Light destroys auxin • Light drives auxin to the shaded side ‘Light eliminates auxin activity’ Tropism video

Gravitropism- starch-statolith plastids hypothesis

Gravitropism- starch-statolith plastids hypothesis

Auxin and root gravitropism

Auxin and root gravitropism

Gravitism video

Gravitism video

Thigmotropism is growth in response to touch • Tendrils of bur cucumber • Enables

Thigmotropism is growth in response to touch • Tendrils of bur cucumber • Enables shoots and roots to navigate, cling and climb • Thigmotropism in Opuntia acanthocarpa flowers video

Thigmotorpism- tendrils of bur cucumber, twisting Caused by different growth Rates on the inside

Thigmotorpism- tendrils of bur cucumber, twisting Caused by different growth Rates on the inside and Outside of tendril

Phototropism • Common response to light

Phototropism • Common response to light

Diurnal movements of Wood sorrel (Oxalis)

Diurnal movements of Wood sorrel (Oxalis)

Diurnal movement- biological clock is the organism keeping itself in time with some external

Diurnal movement- biological clock is the organism keeping itself in time with some external stimulus?

Other types of Movement • Thigmonastic (seismonastic) Movement are results of mechanical stimulation •

Other types of Movement • Thigmonastic (seismonastic) Movement are results of mechanical stimulation • Most night closure (nyctinastic movement) are results from changes in the size of perenchyma cells in the jointlike thickening (pulvinus) structure at the base of each leaf.

Pulvini Mimosa pudica vascular tissue surounded By a cortex which consists largely of thin-walled

Pulvini Mimosa pudica vascular tissue surounded By a cortex which consists largely of thin-walled Parenchyma cells

Mimosa pudica

Mimosa pudica

Entire leaf drops in response To movement, shock, thermal Stimulation, touch Results from changes

Entire leaf drops in response To movement, shock, thermal Stimulation, touch Results from changes in turgor Pressure in pulvini

Touch reponse in the venus flytrap (Dionaea muscipula)

Touch reponse in the venus flytrap (Dionaea muscipula)

Thigmomorphogenesis- The inhibition of growth by touch Arabidopsis thaliana both six weeks of age

Thigmomorphogenesis- The inhibition of growth by touch Arabidopsis thaliana both six weeks of age

Solar tracking Lupine (Lupinus arizonicus)

Solar tracking Lupine (Lupinus arizonicus)

Sunflower solar tracking

Sunflower solar tracking

NASTIC RESPONSES NASTIC RESPONSES Not as well knownunderstoodNASTIC RESPONSES NASTIC RESPONSES Not as well knownunderstood
External Factors and Plant Growth Plant Growth RegulatorsExternal Factors and Plant Growth Plant Growth Regulators
PLANT GROWTH REGULATORS Plant Growth Regulators AKA PlantPLANT GROWTH REGULATORS Plant Growth Regulators AKA Plant
PLANT GROWTH REGULATORS Plant Growth Regulators aka PlantPLANT GROWTH REGULATORS Plant Growth Regulators aka Plant
Plant Growth Factors Physical Growth Factors Amount ofPlant Growth Factors Physical Growth Factors Amount of
PLANT LOCATION PLANT LAYOUT PLANT LOCATION A plantPLANT LOCATION PLANT LAYOUT PLANT LOCATION A plant
Plant Ecology Chapter 7 Growth Reproduction Plant GrowthPlant Ecology Chapter 7 Growth Reproduction Plant Growth
PLANT GROWTH and DEVELOPMENT Phytohormones PLANT GROWTH andPLANT GROWTH and DEVELOPMENT Phytohormones PLANT GROWTH and
Factors and Multiples Factors Prime Factors Common FactorsFactors and Multiples Factors Prime Factors Common Factors
Factors Prime Factors Factors and Prime Factors 1Factors Prime Factors Factors and Prime Factors 1
Regulating Plant Growth Plant Hormones Plant Hormones nRegulating Plant Growth Plant Hormones Plant Hormones n
Plant growth hormones and tropisms Plant growth hormonesPlant growth hormones and tropisms Plant growth hormones
Social Factors Political Factors Religious Factors Intellectual FactorsSocial Factors Political Factors Religious Factors Intellectual Factors
Plant Growth Phases of plant growth Dormancy PeriodPlant Growth Phases of plant growth Dormancy Period
PLANT GROWTH REGULATORS Plant growth regulators or phytohormonesPLANT GROWTH REGULATORS Plant growth regulators or phytohormones
Plant Growth Plant Growth Trumpet vine Patterns ofPlant Growth Plant Growth Trumpet vine Patterns of
FACTORS AFFECTING PLANT GROWTH MEASURING GROWTH Increase inFACTORS AFFECTING PLANT GROWTH MEASURING GROWTH Increase in
Growth and Development Growth Definition of growth FactorsGrowth and Development Growth Definition of growth Factors
Factors affecting bacterial growth Factors affecting bacterial growthFactors affecting bacterial growth Factors affecting bacterial growth
Growth Factors Antibodies of CloudClone Growth factors areGrowth Factors Antibodies of CloudClone Growth factors are
FED TAPERING EXTERNAL STIMULUS EXTERNAL STIMULUS External stimulusFED TAPERING EXTERNAL STIMULUS EXTERNAL STIMULUS External stimulus
External Enclosure External Enclosure Needs The external packageExternal Enclosure External Enclosure Needs The external package
External Analysis External Analysis External Analysis Summary OpportunitiesExternal Analysis External Analysis External Analysis Summary Opportunities