Gravitropism (Geotropism)

Numéro d’image : 12007800
Gravitropism (Geotropism)
Gravitropism (sometimes referred to as geotropism) is a plant response to earth's gravitational field. Plant stems (shoots) exhibit negative gravitropism because they respond by growing away from the gravitational attraction. Gravitropism is initiated when starch filled plastids called amyloplasts sink towards the gravitational field. This stimulates the release of the growth hormone auxin. This bean plant,Phaseolus vulgaris,shows a turn in its stem which occurred after its pot was tipped over. The response also occurs in the dark showing that it is not phototropism
Licence : Droits gérés
Crédit: Science Photo Library / Shields, Martin
Taille de l’image : 4854 px × 3360 px
Model Release : Non requis
Property Release : Non requis
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  • ALL except GBR IRL CAN HKG ZAF USA IND TWN CHN DEU

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