A dynamic balance between gene activation and repression regulates the shade avoidance response in Arabidopsis

Article Abstract:

Plants grown under dense canopies perceive through the phytochrome system a reduction in the ratio of red to far-red light as a warning of competition, and this triggers a series of morphological changes to avoid shade. Several phytochrome signaling intermediates acting as positive regulators of accelerated elongation growth and induction of flowering in shade avoidance were identified and a negative regulatory mechanism ensures that in the presence of far-red-rich light an exaggerated plant response does not occur.

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The FAR1 (ital) locus encodes a novel nuclear protein specific to phytochrome A signaling

Article Abstract:

The FAR1 (ital) locus, which encodes a novel nuclear protein specific to phytochrome A signaling, is discussed. Using Arabidopsis, FRc-specific loss-of-signal-transmission mutants have been studied to characterize potentially positively acting components of phyA signaling. The Arabidopsis mutant is far1 (ital) (far-red-impaired response) with reduced responsiveness to continuous far-red light.

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Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidaes activity

Article Abstract:

The same low red/far-red (R/FR) signal induces hypocotyl elongation also triggers a rapid arrest of leaf primordium growth is reported. Results demonstrate the existence of a previously unrecognized regulatory circuit underlying plant response to canopy shade.

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