PMID- 23109688 OWN - NLM STAT- MEDLINE DCOM- 20130618 LR - 20211021 IS - 1532-2548 (Electronic) IS - 0032-0889 (Print) IS - 0032-0889 (Linking) VI - 161 IP - 1 DP - 2013 Jan TI - Two GRAS proteins, SCARECROW-LIKE21 and PHYTOCHROME A SIGNAL TRANSDUCTION1, function cooperatively in phytochrome A signal transduction. PG - 291-304 LID - 10.1104/pp.112.206607 [doi] AB - Photoreceptors, especially the far-red light-absorbing phytochrome A, play a crucial role in early seedling development, triggering the transition from etiolated to photomorphogenic growth. Here, we describe the biological functions of two GRAS proteins from Arabidopsis (Arabidopsis thaliana), SCARECROW-LIKE21 (SCL21) and PHYTOCHROME A SIGNAL TRANSDUCTION1 (PAT1), which are specifically involved in phytochrome A signal transduction. Loss-of-function mutants show an elongated hypocotyl under far-red light and are impaired in other far-red high-irradiance responses. The SCL21 transcript itself is down-regulated by far-red light in a phytochrome A- and PAT1-dependent manner. Our results demonstrate that both SCL21 and PAT1 are positive regulators of phytochrome A signal transduction for several high-irradiance responses. Genetic and biochemical evidence suggest a direct interaction of the two proteins. FAU - Torres-Galea, Patricia AU - Torres-Galea P AD - Lehrstuhl fur Molekularbiologie der Pflanzen, Department Biologie I, Ludwig-Maximilians-Universitat Munchen, D-82152 Planegg-Martinsried, Germany. FAU - Hirtreiter, Birgit AU - Hirtreiter B FAU - Bolle, Cordelia AU - Bolle C LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20121029 PL - United States TA - Plant Physiol JT - Plant physiology JID - 0401224 RN - 0 (Arabidopsis Proteins) RN - 0 (PAT1 protein, Arabidopsis) RN - 0 (PHYA protein, Arabidopsis) RN - 0 (Photoreceptors, Plant) RN - 0 (Phytochrome A) RN - 0 (RNA, Messenger) RN - 11121-56-5 (Phytochrome) SB - IM MH - Amino Acid Sequence MH - Arabidopsis/genetics/*metabolism/radiation effects MH - Arabidopsis Proteins/genetics/*metabolism MH - Cell Nucleus/genetics/metabolism MH - Epistasis, Genetic MH - *Gene Expression Regulation, Plant MH - Genetic Complementation Test MH - Hypocotyl/growth & development/radiation effects MH - Light MH - Molecular Sequence Data MH - Phenotype MH - Photoreceptors, Plant/genetics/metabolism MH - Phylogeny MH - Phytochrome/genetics/*metabolism MH - Phytochrome A/genetics/*metabolism MH - Protein Interaction Mapping MH - RNA Interference MH - RNA, Messenger/genetics/metabolism MH - *Signal Transduction PMC - PMC3532260 EDAT- 2012/10/31 06:00 MHDA- 2013/06/19 06:00 PMCR- 2014/01/01 CRDT- 2012/10/31 06:00 PHST- 2012/10/31 06:00 [entrez] PHST- 2012/10/31 06:00 [pubmed] PHST- 2013/06/19 06:00 [medline] PHST- 2014/01/01 00:00 [pmc-release] AID - pp.112.206607 [pii] AID - 206607 [pii] AID - 10.1104/pp.112.206607 [doi] PST - ppublish SO - Plant Physiol. 2013 Jan;161(1):291-304. doi: 10.1104/pp.112.206607. Epub 2012 Oct 29.