992 resultados para chlorophyll fluorescence
Resumo:
, C4C3 1nifAdctnifA37dct;dct40nifA 2108/ mL5 mmol/L (NH4)2SO430 mmol/L (NH4)2SO4 3150mol photons m-2s-115mol photons m-2s-177; 4PEPCPCRpmi
Resumo:
157. 5mm315. Omm472. 5mm630. Omm425/2028/23 4157. 5mm315. Omm>>>> 4157. 5mm 44PSII157. 5mm630. Omm 4157. 5mm630. Omrn
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Cathaya argyrophylla100%45%3%3Pnmax(CE)3%1(LCP)(LSP)3%6h45%Pnmax(CE)(LCP)(LSP)1 0-40cm50%;;10cm80%;;
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(Pinus armandi)23 30'-3630'8850'-11330'13: 1)152-3 2)(EIS) 3)(15) 4) 5)36KD 6)36KD 7)4680nm670nm670nm 8)a(Fv/Fo)(Fv/Fm)(Qp)(Qn)QnQp 36KD680nm4(Fv/Fo)(Fv/Fm)
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(ABA)(Pn)(C02)(CE)II (PSII)(PSII)ABAPSII(Fv/Fm)1025mol L-I ABA750mol L-1ABA25mol L-lABAABAPnCEPS II(qP)(NPQ)(qm)Fv/FmABAPsnABA(V)(A)(Z)(V+A+Z)ABAABAPsIIPn(SOD)(APX)(DHAR)(GR)(AsA)(DHAsA)(GSH)(GSSH)ABAMehler-peroxidase III(300molm-2 S-l)655nm700-770 nmI(PSI)II(PSII)1Psn( Fml)PSII( Frri2)20nunPsn2l2PSIIDTTPsII( Fv/Fm)PSII(F0')20minPSIIPSII(B)PSI(a)ABA7PSII(Fm2)Fm1/Fm21-1ABA(qm)NEMABAqm12ABA77KF684/F732ABA 25mol L-l ABA7LT1STC02PsIILTST( Fv/Fm)(CE)(Pn)(Gs)LTST1500mol m-2 s-1Fv/FmLTFv/Fm60minSTFv/FmPS IIPnCELTLT(NPQ)MDASTNPQMDASTLTABAC02
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"5 1 0100200400 mM NaCl;050100150 mM NaCl5IIFv/FmFv/FmPSIIqP;CO2CO2;4CO2CO2PSII4 2 36484245CO2CO2Fv/FmFv/FmqPPSII55 3 30;42MDA42 4 PSII0~800 mMPSIIFv/Fm400 mM800mM NaCl(3040)PSII 5 304230354045504245PSIIFv/Fm;42PSII 6 ;MGDGDGDGPG;42"
Resumo:
PSIIPSIIPSIIPSIIPSIIPSII 1 00.20.40.60.8M NaCl12ChlacarotenoidPCAPC 2 PS IIPS II 3 TLWestern PS IIOEC33PS II;TL B-bandQ-band0-0.6M NaClB-band0.8M NaClSS ;Fm JIPPS IIOEC33S 4 OJIPJIP-testTLPS II JIP-testoEo,QA-QB ;QA-QB QBPQPQQB;TL B-bandQ-bandQAQBPSII 5 PS II 6 PS IIPSIIPSIIQA QBPS IIPSIIPSIIPSII 7 WesternPSIIPSIIPSIICP43CP47OEC33 8 PS IIPC/chlaAPC/chla;IIPS IIPS II;DIo/RC;TRo/RC;I PSII
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IIPSIIPSIIPSIIQA-PSIIPSII 1.PS II PSIIFv/FmFv/Fm5-15% 2.QA-QB PQQBQA-QB(160 ms)(2 ms)S2QA- 4sQAQBPQQBQA-S25II 3. 77K580nm436nmPS IF725F751IPBSPS IIII643nmPBSPS IIIIIICP43CP47 .TLS2QA-S2QB-S2QA-S2QB-TLPSIIQB/QB-QAQBQAQB 5. OJIPKSTLS1S2S2S3OJIP
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UV-BUV-BUV-BUV-BUV-BUV-B (Triticum aestivum)4.2 kJ m-2 d-1 UV-BBELUVB7.0 kJ m-2 d-1 UV-BBEHUVBUV-B20/16;25/2010/54.2 kJ m-2 d-1 UV-BBELUVB10.3 kJ m-2 d-1 UV-BBESHUVBUV-BUV-B 1.LUVB20/1625/20LT50HUVB20/16LT50SHUVB25/20LT50LUVBSHUVB10/5LT50UV-B20/1625/2010/5UV-B 2.20/16UV-B-66 h6 hUV-BCATGPXGRGSH/GSSGTBARSUV-BH2O2UV-BH2O2UV-B 3.25/20LUVBUV-BRGRPnIIFv/FmII(FmFs)/FmqPUV-BCO2CiUV-BUV-BPS II 4.UV-B20/1625/20VVZLUVBDEPSNPQSHUVBDEPSNPQUV-B 5.UV-B25/20SODAPXGRAsA/DHAGSH/GSSG;10/5UV-BSODCATAPXAsA/DHAGPXGSH/GSSGUV-B10/5 6.UV-B10/5UV-BUV-B 7.SHUVBTBARS10/5UV-BUV-B10/5UV-B
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(Lonicera sempervirensL) (Lonicera tragophylla Hemsl.) (Loniceratellmanniana Hort. Spth)33Fv/FmFv/Fm8HOMP
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Many unicellular green algae can become yellow or red in various natural habitats due to mass accumulation of a secondary carotenoid, such as lutein, or astaxanthin. The accumulation of secondary carotenoids is generally thought to be a survival strategy of the algae under photo-oxidative stress or other adverse environmental conditions. The physiological role of the carotenoids in stress response is less well understood at the subcellular or molecular level. In this study, a stable astaxanthin overproduction mutant (MT 2877) was isolated by chemical mutagenesis of a wild type (WT) of the green microalga Haematococcus pluvialis Flotow NIES-144. MT 2877 was identical to the WT with respect to morphology, pigment composition, and growth kinetics during the early vegetative stage of the life cycle. However, it had the ability to synthesize and accumulate about twice the astaxanthin content of the WT under high light, or under high light in the presence of excess amounts of ferrous sulphate and sodium acetate. Under stress, the mutant exhibited higher photosynthetic activities than the WT, based on considerably higher chlorophyll fluorescence induction, chlorophyll autofluorescence intensities, and oxygen evolution rates. Cell mortality caused by stress was reduced by half in the mutant culture compared with the WT. Enhanced protection of the mutant against stress is attributed to its accelerated carotenogenesis and accumulation of astaxanthin. Our results suggest that MT 2877, or other astaxanthin overproduction Haematococcus mutants, may offer dual benefits, as compared with the wild type, by increasing cellular astaxanthin content while reducing cell mortality during stress-induced carotenogenesis.
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Photosynthetic activity during rehydration at four temperatures (5, 15, 25, 35 degrees C) was studied in a terrestrial, highly drought-tolerant cyanobacterium, Nostoc flagelliforme. At all the temperatures, the optimum quantum yield F-v/F-m increased rapidly within I It and then increased slowly during the process of rehydration. The increase in F-v/F-m at 25 and 35 degrees C was larger than that at 5 and 15 degrees C. In addition, the changes of initial intensity of fluorescence (F-0) and variable fluorescence (F-v) were more significant at 25 and 35 degrees C than those at 5 and 15 degrees C. Chlorophyll a content increased with the increase of temperature during the course of rehydration, with this being more pronounced at 25 and 35 degrees C. The photosynthetic rates at 25 and 35 degrees C were higher than those at 5 and 15 degrees C. Induction of chlorophyll fluorescence with sustained rewetting at 5 and 15 degrees C had two phases of transformation, whereas at 25 and 35 degrees C it had a third peak kinetic phase and showed typical chlorophyll fluorescence steps on rewetting for 24 h, representing a normal physiological state. A comparison of the chlorophyll fluorescence parameters, chlorophyll a content, and the chlorophyll fluorescence induction led to the conclusion that N. flagelliforme had a more rapid and complete recovery at 25 and 35 degrees C than that at 5 and 15 degrees C, although it could recover its photosynthetic activity at any of the four temperatures. (c) 2007 Published by Elsevier Ltd.
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Freshwater Microcystis may form dense blooms in eutrophic lakes. It is known to produce a family of related cyclic hepatopeptides (microcystins, MC) that constitute a threat to aquatic ecosystems. Most toxicological studies of microcystins have focused on aquatic animals and plants, with few examining the possible effects of microcystins on phytoplankton. In this study we chose the unicellular Synechococcus elongatus (one of the most studied and geographically most widely distributed cyanobacteria in the picoplankton) as the test material and investigated the biological parameters: growth, pigment (chlorophyll-a, phycocyanin), photosynthetic activity, nitrate reductase activity, and protein and carbohydrate content. The results revealed that microcystin-RR concentrations above 100 mug (.) L-1 significantly inhibited the growth of Synechococcus elongatus. In addition, a change in color of the toxin-treated algae (chlorosis) was observed in the experiments. Furthermore, MC-RR markedly inhibited the synthesis of the pigments chlorophyll-a and phycocyanin. A drastic reduction in photochemical efficiency of PSII (F-v/F-m) was found after a 96-h incubation. Changes in protein and carbohydrate concentrations and in nitrate reductase activity also were observed during the exposure period. This study aimed to evaluate the mechanisms of microcystin toxicity on a cyanobacterium, according to the physiological and biochemical responses of Synechococcus elongatus to different doses of microcystin-RR. The ecological role of microcystins as an allelopathic substance also is discussed in the article. (C) 2004 Wiley Periodicals, Inc.
Resumo:
‘6’()‘58’(),NH3(Pn)(Gs)(Fv/FmFv/F0):PnFv/F0,(P<0.05),Gs(P<0.05);Pn,(P<0.05),Fv/Fm;,NH3,
