Two independent photoperiod pathways, involving the floral r...

created [InstanceEdit:8934132] Jaiswal, Pankaj, 2016-08-08
dbId 8934011
displayName Two independent photoperiod pathways, involving the floral r...
schemaClass Summation
text Two independent photoperiod pathways, involving the floral regulators Heading date 1 (Hd1) and Early heading date 1 (Ehd1), have been implicated in flowering date. Hd1 is predominantly regulated by the circadian clock through OsGIGANTEA (OsGI), a key gene that positively controls Hd1 expression. Hd1 is a zinc finger type transcriptional activator with a conserved CCT-domain that acts as a crucial nuclear localization signal for the correct protein function. Presence of light-active phytochromes could modify Hd1 activity to inhibit Hd3a transcription. Under SD conditions, Hd1 activates Hd3a transcription thereby promoting flowering, whereas under non-inductive LD conditions Hd1 acts as a repressor.