{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T20:25:59Z","timestamp":1761596759236},"reference-count":0,"publisher":"Oxford University Press (OUP)","issue":"3","license":[{"start":{"date-parts":[[1997,3,1]],"date-time":"1997-03-01T00:00:00Z","timestamp":857174400000},"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":[[1997,3,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The amplitude of phototropic curvature to blue light is enhanced by a prior exposure of seedlings to red light. This enhancement is mediated by phytochrome. Fluence-response relationships have been constructed for red-light-induced enhancement in the phytochrome A (phyA) null mutant, the phytochrome B- (phyB) deficient mutant, and in two transgenic lines of Arabidopsis thaliana that overexpress either phyA or phyB. These fluence-response relationships demonstrate the existence of two responses in enhancement, a response in the very-low-to-low-fluence range, and a response in the high-fluence range. Only the response in the high-fluence range is present in the phyA null mutant. In contrast, the phyB-deficient mutant is indistinguishable from the wild-type parent in red-light responsiveness. These data indicate that phyA is necessary for the very-low-to-low but not the high-fluence response, and that phyB is not necessary for either response range. Based on these results, the high-fluence response, if controlled by a single phytochrome, must be controlled by a phytochrome other than phyA or phyB. Overexpression of phyA has a negative effect and overexpression of phyB has an enhancing effect in the high-fluence range. These results suggest that overexpression of either phytochrome perturbs the function of the endogenous photoreceptor system in an unpredictable fashion.<\/jats:p>","DOI":"10.1104\/pp.113.3.975","type":"journal-article","created":{"date-parts":[[2002,7,27]],"date-time":"2002-07-27T05:00:20Z","timestamp":1027746020000},"page":"975-979","source":"Crossref","is-referenced-by-count":71,"title":["Multiple Phytochromes Are Involved in Red-Light-Induced Enhancement of First-Positive Phototropism in Arabidopsis thaliana"],"prefix":"10.1093","volume":"113","author":[{"given":"Ak.","family":"Janoudi","sequence":"first","affiliation":[{"name":"Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824 (A.-k.J., W.R.G., K.L.P.)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W. R.","family":"Gordon","sequence":"additional","affiliation":[{"name":"Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824 (A.-k.J., W.R.G., K.L.P.)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D.","family":"Wagner","sequence":"additional","affiliation":[{"name":"Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824 (A.-k.J., W.R.G., K.L.P.)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P.","family":"Quail","sequence":"additional","affiliation":[{"name":"Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824 (A.-k.J., W.R.G., K.L.P.)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K. L.","family":"Poff","sequence":"additional","affiliation":[{"name":"Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824 (A.-k.J., W.R.G., K.L.P.)"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[1997,3,1]]},"container-title":["Plant Physiology"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/academic.oup.com\/plphys\/article-pdf\/113\/3\/975\/37086899\/plphys_v113_3_975.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"http:\/\/academic.oup.com\/plphys\/article-pdf\/113\/3\/975\/37086899\/plphys_v113_3_975.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,4,17]],"date-time":"2021-04-17T11:54:27Z","timestamp":1618660467000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/plphys\/article\/113\/3\/975\/6070940"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1997,3,1]]},"references-count":0,"journal-issue":{"issue":"3","published-online":{"date-parts":[[1997,3,1]]},"published-print":{"date-parts":[[1997,3,1]]}},"URL":"https:\/\/doi.org\/10.1104\/pp.113.3.975","relation":{},"ISSN":["1532-2548","0032-0889"],"issn-type":[{"value":"1532-2548","type":"electronic"},{"value":"0032-0889","type":"print"}],"subject":[],"published-other":{"date-parts":[[1997,3,1]]},"published":{"date-parts":[[1997,3,1]]}}}