Presentation 18 Plant Hormones (by Dptcrisologo
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Transcript of Presentation 18 Plant Hormones (by Dptcrisologo
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8/3/2019 Presentation 18 Plant Hormones (by Dptcrisologo
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Plant hormones
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Hormones
from Gr. to excite
natural chemicalmessengerstransported totarget cells
minuteconcentrations =substantial change
growth regulators
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Plants respond to stimuli
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Plant hormones coordinate growth,development and responses to stimuli
Tropisms
growth responses
organs curvetowards (+) oraway from (-) astimulus
ex. phototropism,thigmotropism,
gravitropism
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Studies on phototropism
towards or away fromlight
differential growth ofcells on opposite sidesof a shoot or coleoptile
cells on darker sideelongate faster thanthose on the light side
experiments by Darwinand son and FW Went
due to auxindistributions
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Went experiment
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