单词	phototropism
释义	phototropism /ˌfəʊtə(ʊ)ˈtrəʊpɪz(ə)m / /fəʊˈtɒtrəˌpɪz(ə)m / noun [mass noun] Biology The orientation of a plant or other organism in response to light, either towards the source of light (positive phototropism) or away from it (negative phototropism). Compare with heliotropism, phototaxis.The nucleus-localized, flavin-binding gene products, CRY1 and CRY2 are involved in several blue light responses, including phototropism.... Like other interactions between organisms and their environments, plant phototropism can be thought of as a process involving three phases: perception, transduction and response. One of the earliest noted auxin effects was in phototropism, the curvature of stems toward a light source. Derivatives phototropic /fəʊtə(ʊ)ˈtrɒpɪk / adjective ... At the end of the blue light treatment, wild-type hypocotyls showed curvatures of about 60°C and red-fluorescing chloroplasts in the phototropic arch (not shown). Blue-light reception in plants leads to phototropic plant movement, chloroplast relocation, and opening of stomatal guard cells. Phototropins and homologs, recently renamed Phot proteins, comprise a class of blue-light receptors that are involved in phototropic plant movement, chloroplast relocation, and stomatal opening in guard cells.
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