Abstract:
:In higher plants, one of the most striking effects of light at the cellular level is the formation of phytochrome nuclear bodies (PNBs). In Arabidopsis, two types of PNBs have been described: a transient type of PNBs (tPNBs), containing both phytochrome A and phytochrome B, observed during the dark-to-light transition and a relatively photo-stable type of phytochrome B-containing PNBs (sPNBs) under continuous light. Despite the separation of the cell-biological observations of PNBs from the traditional model of light signaling elucidated by genetic and biochemical approaches, a growing body of evidence indicates that PNBs are intimately involved in phytochrome signaling. Both positive and negative light signaling components have been colocalized to PNBs, which provides direct evidence bridging PNBs and phytochrome signaling. In particular, the sPNB serves as an excellent tractable marker for early phytochrome signaling events, and thus provides a remarkable genetic system to investigate the mechanistic connection between interphase subnuclear dynamics and cell signaling.
journal_name
Curr Opin Plant Bioljournal_title
Current opinion in plant biologyauthors
Chen Mdoi
10.1016/j.pbi.2008.06.012subject
Has Abstractpub_date
2008-10-01 00:00:00pages
503-8issue
5eissn
1369-5266issn
1879-0356pii
S1369-5266(08)00115-5journal_volume
11pub_type
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