TABLE 2.

Transcripts repressed in UV-B and intense white light irradiation experimentsa

Category and functionGeneORFTreated/control ratiob
UV low, 20 minUV low, 2 hUV high, 2 hWhite light, 2 h
Amino acid biosynthesis
    Anthranilate synthetase α subunittrpEslr07380.67 ± 0.110.63 ± 0.230.41 ± 0.20.53 ± 0.2
    Threonine synthasethrCsll16880.76 ± 0.180.42 ± 0.080.8 ± 0.190.91 ± 0.17
    Nitrate reductasenarBsll14541.51 ± 0.21.08 ± 0.40.47 ± 0.220.63 ± 0.11
Cell envelope
    Lipoprotein NlpDnlpDslr09930.67 ± 0.340.64 ± 0.310.24 ± 0.121.31 ± 0.57
    UDP-MurNac-tripeptide synthetasemurEslr05280.65 ± 0.120.69 ± 0.120.49 ± 0.110.77 ± 0.14
    Mannosyltransferase BrfbUslr10641.04 ± 0.260.89 ± 0.10.47 ± 0.060.88 ± 0.11
Cellular processes
    HlyD family of secretion proteinshlyDsll11810.85 ± 0.270.93 ± 0.470.49 ± 0.141.14 ± 0.33
    Hemolysinsll19510.72 ± 0.30.82 ± 0.50.46 ± 0.291.09 ± 0.54
    Chemotaxis protein CheAcheAsll12960.89 ± 0.190.9 ± 0.480.19 ± 0.081.09 ± 0.46
    General secretion pathway protein DgspDslr12770.77 ± 0.250.77 ± 0.240.32 ± 0.10.61 ± 0.2
    Preprotein translocase SecY subunitsecYsll18140.83 ± 0.20.82 ± 0.290.41 ± 0.11.04 ± 0.4
Central intermediary metabolism
    Glycogen phosphorylaseglgPsll13560.71 ± 0.150.58 ± 0.110.44 ± 0.110.69 ± 0.13
    Glycogen operon protein GlgXglgXslr18570.3 ± 0.090.37 ± 0.080.16 ± 0.030.38 ± 0.12
Cofactor biosynthesis
    Protoporphyrin IX magnesium chelatase subunitbchHslr10550.82 ± 0.161.02 ± 0.310.5 ± 0.191.4 ± 0.44
    Light-independent protochlorophyllide reductase iron proteinchlLslr07490.27 ± 0.060.24 ± 0.060.11 ± 0.010.48 ± 0.53
    Geranylgeranyl reductasechlPsll10910.42 ± 0.130.46 ± 0.250.13 ± 0.050.39 ± 0.13
    Protochlorophyllide reductase ChlB subunitchlBslr07720.46 ± 0.090.38 ± 0.080.17 ± 0.020.34 ± 0.03
    Protochlorophillide reductase subunit ChlNchlNslr07500.45 ± 0.190.46 ± 0.10.41 ± 0.10.69 ± 0.54
    Transfer RNA-Gln reductasehemAslr18080.69 ± 0.20.71 ± 0.330.29 ± 0.150.37 ± 0.13
    Coproporphyrinogen III oxidasehemFsll11850.43 ± 0.150.46 ± 0.170.21 ± 0.020.23 ± 0.04
    Heme oxygenasehosll11840.36 ± 0.160.46 ± 0.270.11 ± 0.040.23 ± 0.06
    Pyridine nucleotide transhydrogenase α subunitpntAslr12390.54 ± 0.050.55 ± 0.090.5 ± 0.170.67 ± 0.16
    ThioredoxintrxAslr06230.59 ± 0.190.7 ± 0.220.29 ± 0.10.85 ± 0.27
DNA replication, modification, and repair
    DNA ligaseligsll15830.69 ± 0.180.84 ± 0.310.42 ± 0.140.58 ± 0.08
    Formamidopyrimidine-DNA glycosylasemutMslr16890.69 ± 0.090.63 ± 0.090.43 ± 0.110.47 ± 0.05
Energy metabolism
    Agmatine ureohydrolasespeBsll10770.7 ± 0.250.55 ± 0.080.53 ± 0.130.4 ± 0.1
    PhosphofructokinasepfkAsll11960.49 ± 0.050.5 ± 0.070.5 ± 0.130.49 ± 0.11
    Glucose-6-phosphate dehydrogenasezwfslr16430.65 ± 0.180.64 ± 0.150.5 ± 0.141.01 ± 0.3
    Fatty acid desaturasedesAslr13500.76 ± 0.230.84 ± 0.370.45 ± 0.151.25 ± 0.36
Photosynthesis and respiration
    ATP synthase a subunitatpAsll13260.88 ± 0.290.96 ± 0.480.16 ± 0.020.94 ± 0.26
    ATP synthase b subunitatpBslr13290.87 ± 0.271.12 ± 0.520.48 ± 0.241.35 ± 0.56
    ATP synthase g subunitatpCsll13270.82 ± 0.20.87 ± 0.410.14 ± 0.021.03 ± 0.37
    ATP synthase d subunitatpDsll13250.99 ± 0.180.98 ± 0.350.35 ± 0.230.96 ± 0.28
    ATP synthase e subunitatpEslr13300.96 ± 0.111.02 ± 0.20.39 ± 0.061.07 ± 0.19
    ATP synthase subunit batpFsll13241.01 ± 0.211.03 ± 0.430.33 ± 0.050.97 ± 0.26
    ATP synthase subunit batpGsll13231.07 ± 0.231.01 ± 0.460.35 ± 0.030.91 ± 0.27
    ATP synthase subunit aatpIsll13220.94 ± 0.161.03 ± 0.490.47 ± 0.250.91 ± 0.39
    CO2-concentrating concentrating mechanism protein CcmKccmKsll10280.7 ± 0.250.74 ± 0.230.36 ± 0.12.47 ± 0.9
    CO2-concentrating mechanism protein CcmKccmKsll10290.71 ± 0.20.71 ± 0.220.38 ± 0.052.52 ± 0.75
    CO2-concentrating mechanism protein CcmMccmMsll10310.81 ± 0.20.73 ± 0.120.34 ± 0.022.67 ± 0.42
    CO2-concentrating mechanism protein CcmNccmNsll10320.92 ± 0.220.91 ± 0.210.41 ± 0.082.13 ± 0.85
    Ribulose bisphosphate carboxylase large subunitrbcLslr00090.69 ± 0.260.6 ± 0.270.26 ± 0.152.1 ± 1.22
    Ribulose bisphosphate carboxylase small subunitrbcSslr00120.65 ± 0.220.69 ± 0.340.2 ± 0.112.0 ± 0.93
    ChaperonerbcXslr00110.7 ± 0.310.79 ± 0.420.2 ± 0.132.12 ± 1.11
    NADH dehydrogenase subunit 4ndhDsll17330.81 ± 0.320.68 ± 0.270.43 ± 0.075.88 ± 3.02
    P700 apoprotein subunit IapsaAslr18340.3 ± 0.130.24 ± 0.060.05 ± 0.020.18 ± 0.07
    P700 apoprotein subunit IbpsaBslr18350.33 ± 0.140.25 ± 0.060.05 ± 0.020.21 ± 0.08
    Photosystem I subunit VIIpsaCssl05630.44 ± 0.130.39 ± 0.120.1 ± 0.030.21 ± 0.07
    Photosystem I subunit IIpsaDslr07370.36 ± 0.110.49 ± 0.250.09 ± 0.040.26 ± 0.1
    Photosystem I subunit IVpsaEssr28310.4 ± 0.050.45 ± 0.160.22 ± 0.070.35 ± 0.12
    Photosystem I subunit IIIpsaFsll08190.36 ± 0.180.53 ± 0.280.12 ± 0.080.23 ± 0.13
    Photosystem I subunit IXpsaJsml00080.43 ± 0.090.52 ± 0.150.23 ± 0.050.49 ± 0.08
    Photosystem I subunit XpsaKsll06290.93 ± 0.460.58 ± 0.310.46 ± 0.230.36 ± 0.1
    Photosystem I subunit XpsaKssr03900.52 ± 0.060.55 ± 0.030.41 ± 0.020.67 ± 0.12
    Photosystem I subunit XIpsaLslr16550.36 ± 0.070.28 ± 0.070.09 ± 0.010.18 ± 0.06
    Photosystem II P680 chlorophyll A apoproteinpsbBslr09060.51 ± 0.180.85 ± 0.40.26 ± 0.170.62 ± 0.37/PICK>
    Cytochrome b559 a subunitpsbEssr34510.79 ± 0.270.98 ± 0.420.47 ± 0.280.79 ± 0.34
    Photosystem II manganese-stabilizing polypeptidepsbOsll04270.55 ± 0.120.72 ± 0.250.48 ± 0.240.39 ± 0.16
    Cytochrome c550psbVsll02580.66 ± 0.130.74 ± 0.140.84 ± 0.680.42 ± 0.09
    Allophycocyanin a chainapcAslr20670.28 ± 0.080.48 ± 0.260.07 ± 0.040.2 ± 0.09
    Allophycocyanin b chainapcBslr19860.27 ± 0.080.52 ± 0.270.08 ± 0.030.16 ± 0.08
    Phycobilisome LC linker polypeptideapcCssr33830.27 ± 0.050.41 ± 0.120.16 ± 0.030.2 ± 0.04
    Phycobilisome LCM core-membrane linker polypeptideapcEslr03350.35 ± 0.110.49 ± 0.290.1 ± 0.050.27 ± 0.13
    Phycobilisome core componentapcFslr14590.47 ± 0.180.74 ± 0.380.19 ± 0.10.3 ± 0.13
    Phycocyanin a subunitcpcAsll15780.24 ± 0.030.24 ± 0.090.06 ± 0.030.07 ± 0.02
    Phycocyanin b subunitcpcBsll15770.23 ± 0.030.23 ± 0.090.08 ± 0.060.08 ± 0.03
    Phycocyanin-associated linker proteincpcCsll15790.19 ± 0.020.2 ± 0.060.05 ± 0.020.06 ± 0.01
    Phycocyanin-associated linker proteincpcCsll15800.23 ± 0.050.19 ± 0.050.06 ± 0.030.06 ± 0.00
    Phycocyanin-associated linker proteincpcDssl30930.46 ± 0.150.38 ± 0.070.15 ± 0.010.23 ± 0.13
    Phycobilisome rod-core linker polypeptide CpcGcpcGsll14710.35 ± 0.270.14 ± 0.030.27 ± 0.070.31 ± 0.35
    Phycobilisome rod-core linker polypeptide CpcGcpcGslr20510.43 ± 0.160.55 ± 0.290.19 ± 0.130.27 ± 0.1
    Cytochrome c553petJsll17960.98 ± 0.130.79 ± 0.280.22 ± 0.070.75 ± 0.08
Regulatory functions
    Negative aliphatic amidase regulatoramiCslr04470.72 ± 0.330.43 ± 0.150.2 ± 0.120.46 ± 0.22
    Regulatory components of sensory transduction systemcopRsll07890.92 ± 0.070.9 ± 0.141.02 ± 0.210.4 ± 0.05
    Regulatory components of sensory transduction systemlcfGslr18600.54 ± 0.090.68 ± 0.160.44 ± 0.050.58 ± 0.07
    SOS function regulatory proteinlexAsll16260.48 ± 0.10.53 ± 0.220.39 ± 0.150.53 ± 0.14
Transcription
    RNase IIImcslr03460.66 ± 0.120.82 ± 0.220.59 ± 0.120.49 ± 0.18
    RNA polymerase alpha subunitrpoAsll18181.11 ± 0.131.16 ± 0.320.48 ± 0.150.99 ± 0.14
    Anti-sigma B factor antagonistslr18560.37 ± 0.120.57 ± 0.070.32 ± 0.110.47 ± 0.11
Translation
    Seryl-tRNA synthetaseserSslr17030.76 ± 0.141.11 ± 0.290.33 ± 0.061.00 ± 0.43
    tRNA(m1G37)methyltransferasetrmDsll11980.7 ± 0.30.62 ± 0.160.34 ± 0.080.46 ± 0.08
    Processing proteaseymxGslr13310.99 ± 0.181.2 ± 0.380.44 ± 0.111.21 ± 0.24
    DNA-binding protein HUsll17120.51 ± 0.190.58 ± 0.130.38 ± 0.130.58 ± 0.13
    Elongation factor EF-Gfussll08300.56 ± 0.050.63 ± 0.080.49 ± 0.030.55 ± 0.05
    Protein synthesis elongation factor TutufAsll10990.81 ± 0.270.79 ± 0.370.17 ± 0.091.52 ± 0.74
    50S ribosomal protein L1rpl1sll17440.87 ± 0.270.79 ± 0.320.27 ± 0.121.00 ± 0.41
    50S ribosomal protein L2rpl2sll18020.92 ± 0.180.77 ± 0.290.19 ± 0.040.87 ± 0.21
    50S ribosomal protein L4rpl4sll18000.95 ± 0.230.93 ± 0.320.28 ± 0.080.89 ± 0.22
    50S ribosomal protein L5rpl5sll18080.77 ± 0.290.91 ± 0.480.08 ± 0.020.92 ± 0.39
    50S ribosomal protein L6rpl6sll18100.76 ± 0.20.74 ± 0.320.13 ± 0.050.88 ± 0.29
    50S ribosomal protein L10rpl10sll17450.72 ± 0.180.74 ± 0.30.15 ± 0.070.94 ± 0.46
    50S ribosomal protein L11rpl11sll17430.97 ± 0.350.97 ± 0.410.45 ± 0.261.1 ± 0.58
    50S ribosomal protein L12rpl12sll17460.87 ± 0.230.71 ± 0.30.18 ± 0.090.9 ± 0.4
    50S ribosomal protein L13rpl13sll18210.99 ± 0.131.05 ± 0.380.43 ± 0.111.01 ± 0.32
    50S ribosomal protein L14rpl14sll18060.79 ± 0.220.87 ± 0.330.14 ± 0.030.91 ± 0.35
    50S ribosomal protein L15rpl15sll18130.75 ± 0.160.67 ± 0.120.18 ± 0.040.88 ± 0.29
    50S ribosomal protein L16rpl16sll18050.84 ± 0.330.95 ± 0.480.1 ± 0.040.89 ± 0.37
    50S ribosomal protein L17rpl17sll18191.18 ± 0.110.94 ± 0.170.47 ± 0.170.96 ± 0.08
    50S ribosomal protein L18rpl18sll18110.72 ± 0.190.71 ± 0.20.19 ± 0.110.87 ± 0.24
    50S ribosomal protein L22rpl22sll18030.85 ± 0.260.88 ± 0.440.15 ± 0.040.96 ± 0.39
    50S ribosomal protein L23rpl23sll18010.92 ± 0.351.1 ± 0.570.22 ± 0.111.00 ± 0.45
    50S ribosomal protein L24rpl24sll18070.8 ± 0.290.88 ± 0.370.12 ± 0.030.88 ± 0.35
    50S ribosomal protein L29rpl29ssl34360.87 ± 0.271.04 ± 0.590.18 ± 0.050.94 ± 0.33
    50S ribosomal protein L31rpl31ssl34451.11 ± 0.221.04 ± 0.430.46 ± 0.181.09 ± 0.22
    30S ribosomal protein S3rps3sll18040.86 ± 0.270.8 ± 0.320.13 ± 0.040.89 ± 0.34
    30S ribosomal protein S5rps5sll18120.77 ± 0.20.72 ± 0.280.19 ± 0.060.91 ± 0.28
    30S ribosomal protein S8rps8sll18090.74 ± 0.230.8 ± 0.340.13 ± 0.020.95 ± 0.41
    30S ribosomal protein S9rps9sll18221.04 ± 0.321.19 ± 0.590.29 ± 0.081.07 ± 0.44
    30S ribosomal protein S10rps10sll11010.89 ± 0.230.89 ± 0.410.18 ± 0.070.98 ± 0.43
    30S ribosomal protein S17rps17ssl34370.88 ± 0.210.93 ± 0.450.14 ± 0.041.00 ± 0.27
    30S ribosomal protein S19rps19ssl34320.93 ± 0.120.76 ± 0.270.21 ± 0.030.98 ± 0.27
Transport and binding proteins
    Ammonium transporteramt1sll10170.89 ± 0.150.74 ± 0.190.68 ± 0.140.5 ± 0.08
    NH4+ transporteramt1sll01080.75 ± 0.110.72 ± 0.30.72 ± 0.110.33 ± 0.06
    Glucose transport proteinglcPsll07710.65 ± 0.120.54 ± 0.110.35 ± 0.110.57 ± 0.2
    High-affinity branched-chain amino acid transport proteinlivHslr12000.72 ± 0.150.62 ± 0.10.74 ± 0.280.38 ± 0.15
    Nitrate transport protein NrtDnrtDsll14531.63 ± 0.211.2 ± 0.460.45 ± 0.050.75 ± 0.13
    Glutamine-binding periplasmic proteinsll12700.57 ± 0.180.59 ± 0.10.4 ± 0.170.49 ± 0.11
    Binding protein of ABC transportersll17620.56 ± 0.160.55 ± 0.150.31 ± 0.080.53 ± 0.12
    Probable sodium/calcium exchanger proteinslr06810.71 ± 0.110.79 ± 0.120.48 ± 0.050.65 ± 0.15
    Permease protein of branched-chain amino acid ABC transporterslr12010.79 ± 0.230.75 ± 0.090.56 ± 0.140.39 ± 0.11
Other categories
AT103sll12140.77 ± 0.320.94 ± 0.610.33 ± 0.20.61 ± 0.35
    Light-repressed proteinlrtAsll09470.63 ± 0.180.8 ± 0.230.46 ± 0.170.67 ± 0.11
    Phytochromecph1slr04730.51 ± 0.120.52 ± 0.180.26 ± 0.110.59 ± 0.14
    Dienelactone hydrolaseclcDsll12981.47 ± 1.151.16 ± 0.610.07 ± 0.010.92 ± 0.41
    Iron-regulated proteinfrpCsll10090.5 ± 0.10.71 ± 0.10.68 ± 0.230.37 ± 0.07
    GlpX proteinglpXslr20940.64 ± 0.220.7 ± 0.340.28 ± 0.160.99 ± 0.48
    Cytochrome b subunit of nitric oxide reductasenorBsll04500.52 ± 0.130.59 ± 0.140.65 ± 0.310.34 ± 0.02
    Membrane proteinpilMslr12740.87 ± 0.130.84 ± 0.260.49 ± 0.251.00 ± 0.21
    Twitching mobility proteinpilTsll15330.6 ± 0.170.63 ± 0.150.28 ± 0.080.5 ± 0.08
    Phenoxybenzoate dioxygenasepobAsll12970.9 ± 0.170.7 ± 0.380.46 ± 0.091.07 ± 0.58
    Rehydrinslr11980.67 ± 0.30.92 ± 0.490.46 ± 0.281.06 ± 0.55
    GDP-fucose synthetasesll12131.01 ± 0.241.08 ± 0.50.5 ± 0.191.19 ± 0.36
    Carboxymuconolactone decarboxylaseslr18530.39 ± 0.060.45 ± 0.160.15 ± 0.040.43 ± 0.09
Hypothetical proteins
sll01721.14 ± 0.90.71 ± 0.350.89 ± 0.350.5 ± 0.23
sll01731.06 ± 0.730.74 ± 0.120.78 ± 0.180.49 ± 0.1
sll05130.84 ± 0.10.79 ± 0.160.49 ± 0.130.86 ± 0.14
sll05430.46 ± 0.10.59 ± 0.140.28 ± 0.110.73 ± 0.29
sll06300.13 ± 0.081.12 ± 1.551.51 ± 1.080.69 ± 0.28
sll07350.75 ± 0.110.8 ± 0.210.45 ± 0.060.76 ± 0.3
sll07880.8 ± 0.160.8 ± 0.221.22 ± 0.340.35 ± 0.1
sll08220.87 ± 0.190.71 ± 0.220.47 ± 0.220.74 ± 0.27
sll13580.42 ± 0.120.38 ± 0.10.22 ± 0.050.29 ± 0.05
sll13590.56 ± 0.090.49 ± 0.050.47 ± 0.10.36 ± 0.05
sll15310.98 ± 0.320.77 ± 0.180.37 ± 0.090.78 ± 0.15
sll15860.66 ± 0.080.68 ± 0.070.77 ± 0.30.38 ± 0.03
sll16650.73 ± 0.280.81 ± 0.380.5 ± 0.240.86 ± 0.29
sll17830.38 ± 0.130.62 ± 0.120.23 ± 0.030.47 ± 0.07
sll17840.37 ± 0.180.5 ± 0.320.13 ± 0.040.29 ± 0.1
sll18300.44 ± 0.270.35 ± 0.090.38 ± 0.270.3 ± 0.05
sll19260.52 ± 0.090.57 ± 0.110.33 ± 0.040.79 ± 0.13
slr01440.68 ± 0.190.51 ± 0.170.28 ± 0.050.62 ± 0.38
slr01450.86 ± 0.520.5 ± 0.130.4 ± 0.040.76 ± 0.75
slr01460.66 ± 0.230.56 ± 0.120.31 ± 0.060.69 ± 0.45
slr01470.66 ± 0.370.43 ± 0.150.31 ± 0.050.58 ± 0.51
slr01480.7 ± 0.370.52 ± 0.060.46 ± 0.040.89 ± 0.63
slr01490.8 ± 0.530.68 ± 0.260.44 ± 0.130.83 ± 0.26
slr01510.76 ± 0.180.74 ± 0.190.44 ± 0.120.68 ± 0.24
    Similar to glutathione S-transferaseslr02361.16 ± 0.191.09 ± 0.240.45 ± 0.080.89 ± 0.17
slr02440.52 ± 0.060.66 ± 0.090.39 ± 0.070.6 ± 0.09
slr02840.59 ± 0.20.5 ± 0.330.64 ± 0.161.1 ± 0.14
slr05720.52 ± 0.10.5 ± 0.10.48 ± 0.250.62 ± 0.21
slr07080.49 ± 0.10.48 ± 0.10.38 ± 0.130.49 ± 0.06
slr07790.94 ± 0.330.95 ± 0.490.19 ± 0.11.14 ± 0.51
slr08880.55 ± 0.10.61 ± 0.240.35 ± 0.160.58 ± 0.07
slr09141.04 ± 0.430.96 ± 0.180.45 ± 0.210.99 ± 0.29
slr10740.99 ± 0.381.26 ± 0.210.46 ± 0.343.69 ± 0.79
slr12400.78 ± 0.330.65 ± 0.110.47 ± 0.060.72 ± 0.32
slr12750.79 ± 0.110.75 ± 0.110.33 ± 0.080.99 ± 0.33
slr12760.81 ± 0.060.73 ± 0.20.36 ± 0.090.97 ± 0.22
slr14370.54 ± 0.150.81 ± 0.260.35 ± 0.130.76 ± 0.09
slr14380.62 ± 0.080.81 ± 0.10.45 ± 0.170.6 ± 0.12
slr14850.51 ± 0.120.69 ± 0.090.24 ± 0.060.72 ± 0.38
slr15350.65 ± 0.110.76 ± 0.30.38 ± 0.170.29 ± 0.13
slr16181.03 ± 0.10.96 ± 0.150.48 ± 0.190.88 ± 0.25
slr16191.04 ± 0.150.96 ± 0.210.49 ± 0.110.93 ± 0.2
slr16340.86 ± 0.110.7 ± 0.080.56 ± 0.110.45 ± 0.11
slr18520.35 ± 0.070.37 ± 0.10.19 ± 0.030.36 ± 0.08
slr18540.36 ± 0.050.47 ± 0.160.12 ± 0.030.39 ± 0.08
slr18550.26 ± 0.050.38 ± 0.170.08 ± 0.050.37 ± 0.08
slr19580.65 ± 0.20.66 ± 0.090.28 ± 0.060.52 ± 0.1
slr20520.5 ± 0.110.4 ± 0.130.27 ± 0.090.34 ± 0.07
    Hypothetical protein YCF50slr20730.76 ± 0.250.73 ± 0.320.46 ± 0.280.84 ± 0.33
slr20770.46 ± 0.10.58 ± 0.180.23 ± 0.050.33 ± 0.05
ssl04830.76 ± 0.190.9 ± 0.380.49 ± 0.270.53 ± 0.21
ssl10460.51 ± 0.090.55 ± 0.050.44 ± 0.10.87 ± 0.13
ssl17920.95 ± 0.340.99 ± 0.000.52 ± 0.001.13 ± 0.65
  • a Synechocystis gene transcripts repressed more than twofold by UV-B or high intensity white light irradiation.

  • b Average expression ratios (treated/control ratio explained in Materials and Methods) and standard deviations from four experiments are included. The treatments were as follows: 20 microeinsteins of UV-B m−2 s−1 (UV low) for 20 min or 2 h; 60 microeinsteins of UV-B m−2 s−1 (UV high) for 2 h; and 200 microeinsteins of intense white light m−2 s−1 for 2 h. Standard deviations were calculated from eight independent measurements of duplicated RNA samples (20 microeinsteins of UV-B m−2 s−1 for 20 min or for 2 h) or four independent measurements of single RNA samples (60 microeinsteins of UV-B m−2 s−1 for 2 h and 200 microeinsteins of white light m−2 s−1 for 2 h). Genes with expression levels unchanged (expression ratio between 2 and 0.5, or sum of ratio and standard deviation is more than 1.0) in all four experiments are not included in the tables. Transcript levels that were repressed more than twofold are shown in bold type.