The Role of Plastids in Gravitropism
In contrast to most animals, plants are largely sessile, so these organisms have had to develop survival strategies that differ from those of most animals. Whereas many animals migrate in search of favorable environmental conditions (i.e. water, food supply, climate, low predation), plants can adjust to their environment through directed growth (i.e. tropisms). For instance, plant roots develop in soil to optimize anchorage and absorption of water and nutrients. Shoots develop above the ground, and their morphology is tailored to suit lighting needs and optimize placement in wind currents. Thus, plants direct their growth in response to local environmental conditions.
KeywordsEndodermal Cell Gravitropic Response Gravity Signal Root Gravitropism Columella Cell
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