phototropic

/foh-tuh-trop-ik, -troh-pik/US // ˌfoʊ təˈtrɒp ɪk, -ˈtroʊ pɪk //

向光性,向光性的,趋光性,向光型

Definitions

adj.形容词 adjective

1
Botany.
- : growing toward or away from the light.
- : taking a particular direction under the influence of light.

For the past decade, he has used the phototropic properties of cyanobacteria to produce images in Petri dishes.
Thus the leaflets of Mimosa pudica acted on by light from above fold upwards, the phototropic effect being positive.
But the same leaflets acted on by light from below exhibit a folding upwards, the phototropic effect being now negative.
This has even led to assumption that there are phototropic particles which function like statoliths in geotropic organs.
As the responsive movement is towards light, the phototropic effect must be regarded as positive.
I shall now describe the phototropic effect of unilateral light in pulvinated, and in growing organs.