title: The cryptochrome gene family in pea includes two differentially expressed CRY2 genes.
abstract: The cryptochromes are a family of blue light photoreceptors that play important roles in the control of plant development. We have characterised the cryptochrome gene family in the model legume garden pea (Pisum sativum L.). Pea contains three expressed cryptochrome genes; a single CRY1 orthologue, and two distinct CRY2 genes that we have termed CRY2a and CRY2b. Genomic southern blots indicate that there are unlikely to be more CRY genes in pea. Each of the three genes encodes a full-length CRY protein that contains all the major domains characteristic of other higher plant cryptochromes. Database searches have identified Medicago truncatula expressed sequence tags (ESTs) corresponding to all three genes, whereas only a single CRY2 is represented in EST collections from the more distantly related legumes soybean and Lotus japonicus. The proteins encoded by the pea and Medicago CRY2b genes are distinguished from other CRY2 proteins by their shorter C-terminus. Expression analyses have identified marked differences in the regulation of the three genes, with CRY2b expression in particular distinguished by high-amplitude diurnal cycling and rapid repression in seedlings transferred from darkness to blue light.
authors.affiliation: School of Plant Science, University of Tasmania, Private Bag 55, Hobart, Tasmania 7001, Australia.
authors.forename: J Damien
authors.initials: JD
authors.lastname: Platten
authors.forename: Eloise
authors.initials: E
authors.lastname: Foo
authors.forename: Fabrice
authors.initials: F
authors.lastname: Foucher
authors.forename: Valérie
authors.initials: V
authors.lastname: Hecht
authors.forename: James B
authors.initials: JB
authors.lastname: Reid
authors.forename: James L
authors.initials: JL
authors.lastname: Weller
mesh_terms: D000595:Amino Acid Sequence; D003116:Color; D056931:Cryptochromes; D005420:Flavoproteins / Q000737:chemistry / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000235:genetics*; D018532:Pisum sativum / Q000235:genetics*; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013997:Time Factors; D014158:Transcription, Genetic / Q000235:genetics
chemical_list: D056931:Cryptochromes; D005420:Flavoproteins; D010940:Plant Proteins