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The work presented here tests whether PHOT is involved in expression of light\u2010regulated genes in <jats:italic>Chlamydomonas reinhardtii<\/jats:italic>. When <jats:italic>C. reinhardtii<\/jats:italic> was transferred from the dark to very low\u2010fluence rate white light, there was a substantial increase in the level of transcripts encoding glutamate\u20101\u2010semialdehyde aminotransferase (GSAT), phytoene desaturase (PDS) and light\u2010harvesting polypeptides (e.g. LHCBM6). Increased levels of these transcripts were also elicited by low\u2010intensity blue light, and this blue\u2010light stimulation was suppressed in three different RNAi strains that synthesize low levels of PHOT. The levels of <jats:italic>GSAT<\/jats:italic> and <jats:italic>LHCBM6<\/jats:italic> transcripts also increased following exposure of algal cells to low\u2010intensity red light (RL). The red\u2010light\u2010dependent increase in transcript abundance was not affected by the electron transport inhibitor 3\u2010(3,4\u2010dichlorophenyl)\u20101,1\u2010dimethylurea, implying that the influence of RL on transcript accumulation was not controlled by cytoplasmic redox conditions, and that a red\u2010light photoreceptor(s) may be involved in regulating the levels of transcripts from specific photosynthesis\u2010related genes in <jats:italic>C. reinhardtii<\/jats:italic>. Interestingly, elevated <jats:italic>GSAT<\/jats:italic> and <jats:italic>LHCBM6<\/jats:italic> transcript levels in RL were significantly reduced in the PHOT RNAi strains, which raises the possibility of co\u2010action between blue and RL signaling pathways. Microarray experiments indicated that the levels of several transcripts for photosystem (PS) I and II polypeptides were also modulated by PHOT. These data suggest that, in <jats:italic>C. reinhardtii<\/jats:italic>, (i) PHOT is involved in blue\u2010light\u2010mediated changes in transcript accumulation, (ii) synchronization of the synthesis of chlorophylls (Chl), carotenoids, Chl\u2010binding proteins and other components of the photosynthetic apparatus is achieved, at least in part, through PHOT\u2010mediated signaling, and (iii) a red\u2010light photoreceptor can also influence levels of certain transcripts associated with photosynthetic function, although its action requires normal levels of PHOT.<\/jats:p>","DOI":"10.1111\/j.1365-313x.2006.02852.x","type":"journal-article","created":{"date-parts":[[2006,8,30]],"date-time":"2006-08-30T11:35:42Z","timestamp":1156937742000},"page":"1-16","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":122,"title":["Phototropin involvement in the expression of genes encoding chlorophyll and carotenoid biosynthesis enzymes and LHC apoproteins in <i>Chlamydomonas reinhardtii<\/i>"],"prefix":"10.1111","volume":"48","author":[{"given":"Chung\u2010Soon","family":"Im","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan","family":"Eberhard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaiyao","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph F.","family":"Beck","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arthur R.","family":"Grossman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,8,30]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.118.3.1021"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.042294599"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.232703799"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.96.23.13554"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1006297731456"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00425-005-0021-2"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0167-4781(02)00500-6"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.271.46.28861"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00202639"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-313X.1999.00475.x"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/352760510X.ch13"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01089034"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1105\/tpc.002154"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1093\/jxb\/eri180"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M406358200"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1022393406204"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.103.024372"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.104.4.1251"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.115.4.1533"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1336802100"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0931459100"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1399-3054.2002.1150416.x"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1105\/tpc.6.2.265"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1007\/s004250050709"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1105\/tpc.8.12.2245"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00040834"},{"key":"e_1_2_7_28_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751-1097.1992.tb02218.x"},{"key":"e_1_2_7_29_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.113.3.975"},{"key":"e_1_2_7_30_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1399-3054.1997.tb00997.x"},{"key":"e_1_2_7_31_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.103.029439"},{"key":"e_1_2_7_32_1","doi-asserted-by":"crossref","first-page":"13541","DOI":"10.1016\/S0021-9258(18)90727-1","article-title":"Regulation of light\u2010harvesting chlorophyll\u2010binding protein mRNA accumulation in Chlamydomonas reinhardtii. 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