{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T04:29:30Z","timestamp":1790224170212,"version":"4.1.0"},"reference-count":30,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[2005,5,27]],"date-time":"2005-05-27T00:00:00Z","timestamp":1117152000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2005,6,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Long day (LD) exposure of rosette plants causes rapid stem\/petiole elongation, a more vertical growth habit, and flowering; all changes are suggestive of a role for the gibberellin (GA) plant growth regulators. For Arabidopsis (Arabidopsis thaliana) L. (Heynh), we show that enhancement of petiole elongation by a far-red (FR)-rich LD is mimicked by a brief (10 min) end-of-day (EOD) FR exposure in short day (SD). The EOD response shows red (R)\/FR photoreversibility and is not affected in a phytochrome (PHY) A mutant so it is mediated by PHYB and related PHYs. FR photoconversion of PHYB to an inactive form activates a signaling pathway, leading to increased GA biosynthesis. Of 10 GA biosynthetic genes, expression of the 20-oxidase, AtGA20ox2, responded most to FR (up to a 40-fold increase within 3 h). AtGA20ox1 also responded but to a lesser extent. Stimulation of petiole elongation by EOD FR is reduced in a transgenic AtGA20ox2 hairpin gene silencing line. By contrast, it was only in SD that a T-DNA insertional mutant of AtGA20ox1 (ga5-3) showed reduced response. Circadian entrainment to a daytime pattern provides an explanation for the SD expression of AtGA20ox1. Conversely, the strong EOD\/LD FR responses of AtGA20ox2 may reflect its independence of circadian regulation. While FR acting via PHYB increases expression of AtGA20ox2, other GA biosynthetic genes are known to respond to R rather than FR light and\/or to other PHYs. Thus, there must be different signal transduction pathways, one at least showing a positive response to active PHYB and another showing a negative response.<\/jats:p>","DOI":"10.1104\/pp.104.059055","type":"journal-article","created":{"date-parts":[[2005,5,28]],"date-time":"2005-05-28T02:06:46Z","timestamp":1117246006000},"page":"1106-1116","source":"Crossref","is-referenced-by-count":157,"title":["The Involvement of Gibberellin 20-Oxidase Genes in Phytochrome-Regulated Petiole Elongation of Arabidopsis"],"prefix":"10.1093","volume":"138","author":[{"given":"Tamotsu","family":"Hisamatsu","sequence":"first","affiliation":[{"name":"National Institute of Floricultural Science, Tsukuba 305\u20138519, Japan (T.H., M.K.); and Commonwealth Scientific and Industrial Research Organization, Plant Industry, Canberra 2601, Australian Capital Territory, Australia (T.H., R.W.K., C.A.H.)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rod W.","family":"King","sequence":"additional","affiliation":[{"name":"National Institute of Floricultural Science, Tsukuba 305\u20138519, Japan (T.H., M.K.); and Commonwealth Scientific and Industrial Research Organization, Plant Industry, Canberra 2601, Australian Capital Territory, Australia (T.H., R.W.K., C.A.H.)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris A.","family":"Helliwell","sequence":"additional","affiliation":[{"name":"National Institute of Floricultural Science, Tsukuba 305\u20138519, Japan (T.H., M.K.); and Commonwealth Scientific and Industrial Research Organization, Plant Industry, Canberra 2601, Australian Capital Territory, Australia (T.H., R.W.K., C.A.H.)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masaji","family":"Koshioka","sequence":"additional","affiliation":[{"name":"National Institute of Floricultural Science, Tsukuba 305\u20138519, Japan (T.H., M.K.); and Commonwealth Scientific and Industrial Research Organization, Plant Industry, Canberra 2601, Australian Capital Territory, Australia (T.H., R.W.K., C.A.H.)"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2005,5,27]]},"reference":[{"key":"2021050607400712300_R1","doi-asserted-by":"crossref","unstructured":"Alonso JM, Stepanova AN, Leisse TJ, Kim CJ, Chen H, Shinn P, Stevenson DK, Zimmerman J, Barajas P, Cheuk R, et al (2003) Genome-wide insertional mutagenesis of Arabidopsis thaliana.Science301:653\u2013657","DOI":"10.1126\/science.1086391"},{"key":"2021050607400712300_R2","doi-asserted-by":"crossref","unstructured":"Bagnall DJ, King RW (2001) Phytochrome and flowering of Arabidopsis thaliana: photophysiological studies using mutants and transgenic lines. 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