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000856917 1001_ $$0P:(DE-Juel1)165737$$aKeller, Beat$$b0$$eCorresponding author
000856917 245__ $$aMaximum fluorescence and electron transport kinetics determined by light-induced fluorescence transients (LIFT) for photosynthesis phenotyping
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000856917 520__ $$aPhotosynthetic phenotyping requires quick characterization of dynamic traits when measuring large plant numbers in a fluctuating environment. Here, we evaluated the light-induced fluorescence transient (LIFT) method for its capacity to yield rapidly fluorometric parameters from 0.6 m distance. The close approximation of LIFT to conventional chlorophyll fluorescence (ChlF) parameters is shown under controlled conditions in spinach leaves and isolated thylakoids when electron transport was impaired by anoxic conditions or chemical inhibitors. The ChlF rise from minimum fluorescence (Fo) to maximum fluorescence induced by fast repetition rate (Fm−FRR) flashes was dominated by reduction of the primary electron acceptor in photosystem II (QA). The subsequent reoxidation of QA− was quantified using the relaxation of ChlF in 0.65 ms (Fr1) and 120 ms (Fr2) phases. Reoxidation efficiency of QA− (Fr1/Fv, where Fv = Fm−FRR − Fo) decreased when electron transport was impaired, while quantum efficiency of photosystem II (Fv/Fm) showed often no significant effect. ChlF relaxations of the LIFT were similar to an independent other method. Under increasing light intensities, Fr2′/Fq′ (where Fr2′ and Fq′ represent Fr2 and Fv in the light-adapted state, respectively) was hardly affected, whereas the operating efficiency of photosystem II (Fq′/Fm′) decreased due to non-photochemical quenching. Fm−FRR was significantly lower than the ChlF maximum induced by multiple turnover (Fm−MT) flashes. However, the resulting Fv/Fm and Fq′/Fm′ from both flashes were highly correlated. The LIFT method complements Fv/Fm with information about efficiency of electron transport. Measurements in situ and from a distance facilitate application in high-throughput and automated phenotyping.
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000856917 7001_ $$0P:(DE-HGF)0$$aVass, Imre$$b1
000856917 7001_ $$0P:(DE-Juel1)129358$$aMatsubara, Shizue$$b2
000856917 7001_ $$0P:(DE-HGF)0$$aPaul, Kenny$$b3
000856917 7001_ $$0P:(DE-Juel1)169447$$aJedmowski, Christoph$$b4
000856917 7001_ $$0P:(DE-Juel1)129379$$aPieruschka, Roland$$b5
000856917 7001_ $$0P:(DE-Juel1)159592$$aNedbal, Ladislav$$b6
000856917 7001_ $$0P:(DE-Juel1)129388$$aRascher, Uwe$$b7
000856917 7001_ $$0P:(DE-Juel1)161185$$aMuller, Onno$$b8
000856917 773__ $$0PERI:(DE-600)1475688-2$$a10.1007/s11120-018-0594-9$$n2$$p221-233$$tPhotosynthesis research$$v140$$x0166-8595$$y2019
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