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Article Addendum

Spatial-specific phytochrome responses during de-etiolation in Arabidopsis thaliana

Beronda L. Montgomery

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Photoreceptors exhibit complex regulation of many aspects of growth and development, including developmental-, spatial- and temporal-specific photoregulatory responses. Such diverse regulation has been noted for all major classes of photoreceptors in plants, including red/far-red (R/FR) absorbing phytochromes and blue/UV-A (B/UV-A) light-absorbing cryptochromes and phototropins. However, the most insight into spatiotemporal responses has been reported for phytochromes both at the physiological and, more recently, at the molecular levels. Through tissue-specific degradation of the phytochrome chromophore, my laboratory recently demonstrated that phytochromes exhibit light-dependent, spatiotemporal control over de-etiolation responses in Arabidopsis thaliana. Mesophyll-localized phytochrome A (phyA) controls numerous far-red high irradiance responses (FR-HIR) in Arabidopsis. Meristem- and/or leaf primordia-localized phytochromes are involved in the regulation of leaf development. In this addendum, I provide additional novel evidence for spatial-specific, blue-light-dependent signaling roles of phytochromes.

Addendum to: Warnasooriya SN, Montgomery BL. Detection of spatial-specific phytochrome responses using targeted expression of biliverdin reductase in Arabidopsis thaliana. Plant Physiol 2008; In press; PMID: 18971430; DOI: 10.1104/pp.108.127050.

Authors

Beronda L. Montgomery

This is an open-access article

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