Abstract
The bending of the seedling stem toward unilateral light is caused by asymmetrical auxin distribution between the shaded and illuminated sides of plant organs. In recent years, genetic analysis has shown that plant may have different mechanisms in response to different light intensities in phototropism. In weak blue light, blue light receptors phototropin1 (PHOT1) regulates phototropism by directly interacting with signaling proteins NPH3, RPT2 and PKS1, resulting in asymmetrical distribution of auxin. In strong blue light, PHOT1 and PHOT2 contribute redundantly to blue-light-induced phototropic curvature of hypocotyls. The NPH3 may act as a common factor in different signaling pathways to complement functions. In addition, other photoreceptors, such as hormones, protein phosphatase and Ca2+, are also involved in phototropic response. This paper summarized some signaling components and their possible relationship in phototropism, and the problems remained are discussed, finally the possible research directions in this field are proposed.
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Claims 6
Claim · model-written summary
Asymmetric auxin distribution between shaded and illuminated sides causes seedling stems to bend toward unilateral light.
Verbatim
e0“The bending of the seedling stem toward unilateral light is caused by asymmetrical auxin distribution between the shaded and illuminated sides of plant organs”
Claim · model-written summary
Plants may use different phototropism mechanisms at different light intensities.
Verbatim
e0“plant may have different mechanisms in response to different light intensities in phototropism”
Claim · model-written summary
Under weak blue light, PHOT1 interacts with NPH3, RPT2 and PKS1 to regulate phototropism and asymmetric auxin distribution.
Verbatim
e0“In weak blue light, blue light receptors phototropin1 (PHOT1) regulates phototropism by directly interacting with signaling proteins NPH3, RPT2 and PKS1, resulting in asymmetrical distribution of auxin”
t0“Plant”
Claim · model-written summary
Under strong blue light, PHOT1 and PHOT2 redundantly contribute to hypocotyl phototropic curvature.
Verbatim
e0“In strong blue light, PHOT1 and PHOT2 contribute redundantly to blue-light-induced phototropic curvature of hypocotyls”
t0“Plant”
Claim · model-written summary
NPH3 may be a common factor across phototropism signaling pathways.
Verbatim
e0“The NPH3 may act as a common factor in different signaling pathways to complement functions”
t0“Plant”
Claim · model-written summary
Other photoreceptors, hormones, protein phosphatase and Ca2+ are involved in phototropic response.
Verbatim
e0“other photoreceptors, such as hormones, protein phosphatase and Ca2+, are also involved in phototropic response”
t0“Plant”