Analysis of fast chlorophyll fluorescence rise (O-K-J-I-P) curves in green fruits indicates electron flow limitations at the donor side of PSII and the acceptor sides of both photosystems

Kalachanis, Dimitrios; Manetas, Yiannis

doi:10.1111/j.1399-3054.2010.01362.x

Cited by 23 publications

(36 citation statements)

References 45 publications

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“…According to the recent view, O-J phase is related to the accumulation of Q À A , I-P is associated with PQ pool reduction while J-I is not related with reduction in the PQ pool (Gauthier et al 2010) while J-I phase was shown to be suppressed which affect the OEC (Schreiber and Neubauer 1987). The I-P amplitude in the transient has also been related to the relative size of the pools of final PS I electron acceptors (Kalachanis and Manetas 2010).…”

Section: Resultsmentioning

confidence: 99%

Effects of dual stress (high salt and high temperature) on the photochemical efficiency of wheat leaves (Triticum aestivum)

Mathur

Mehta

Jajoo

2012

Physiol Mol Biol Plants

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In this study, we have focused on those components of Photosystem (PS) II which are significantly affected by dual stress (high salt and temperature) on wheat as measured by Plant Efficiency Analyser (PEA). It was observed that some of the chlorophyll a fluorescence parameters were temperature dominated, while some other parameters were salt dominated. We have also observed additive effects for parameters like antenna size heterogeneity. An important observation was that in high temperature alone, the K-step was observed at 40°C, while in case of dual stress, the K-step was observed at 45°C, while the Chl a fluorescence transient of 40°C+0.5 MNaCl was quite similar to 35°C transient curve. In the presence of salt, Kstep was observed at higher temperature suggesting a protection of OEC by salt. Plants are under dual stress, but effect of temperature stress is less severe in presence of salt stress. Thus, we can say that salt stress caused partial prevention from high temperature stress but it did not cause complete protection of PS II.

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Section: Resultsmentioning

confidence: 99%

Effects of dual stress (high salt and high temperature) on the photochemical efficiency of wheat leaves (Triticum aestivum)

Mathur

Mehta

Jajoo

2012

Physiol Mol Biol Plants

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“…Kotakis et al (2006) further showed that cyclic electron flow is enhanced (at the expense of the linear photosynthetic electron flow) in twig collenchyma to adjust potential ATP/NADPH ratios and/or to counteract the detrimental effects of hypoxia. This, combined with the increased activity of non-photochemical quenching via the xanthophyll cycle observed in apple (Cheng and Ma, 2004) and grapevine (Young et al, 2016), suggest that non-foliar photosynthesis is possibly required to produce ATP in organs where gas exchange is prevented (Kalachanis and Manetas, 2010). …”

Section: Discussionmentioning

confidence: 99%

The Transcriptional Responses and Metabolic Consequences of Acclimation to Elevated Light Exposure in Grapevine Berries

et al. 2017

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An increasing number of field studies that focus on grapevine berry development and ripening implement systems biology approaches; the results are highlighting not only the intricacies of the developmental programming/reprogramming that occurs, but also the complexity of how profoundly the microclimate influences the metabolism of the berry throughout the different stages of development. In a previous study we confirmed that a leaf removal treatment to Sauvignon Blanc grapes, grown in a highly characterized vineyard, primarily affected the level of light exposure to the berries throughout their development. A full transcriptomic analysis of berries from this model vineyard details the underlying molecular responses of the berries in reaction to the exposure and show how the berries acclimated to the imposing light stress. Gene expression involved in the protection of the photosynthetic machinery through rapid protein-turnover and the expression of photoprotective flavonoid compounds were most significantly affected in green berries. Overall, the transcriptome analysis showed that the berries implemented multiple stress-mitigation strategies in parallel and metabolite analysis was used to support the main findings. Combining the transcriptome data and amino acid profiling provided evidence that amino acid catabolism probably contributed to the mitigation of a likely energetic deficit created by the upregulation of (energetically) costly stress defense mechanisms. Furthermore, the rapid turnover of essential proteins involved in the maintenance of primary metabolism and growth in the photosynthetically active grapes appeared to provide precursors for the production of protective secondary metabolites such as apocarotenoids and flavonols in the ripening stages of the berries. Taken together, these results confirmed that the green grape berries responded to light stress much like other vegetative organs and were able to acclimate to the increased exposure, managing their metabolism and energy requirements to sustain the developmental cycle toward ripening. The typical metabolic consequences of leaf removal on grape berries can therefore now be linked to increased light exposure through mechanisms of photoprotection in green berries that leads toward acclimation responses that remain intact until ripening.

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“…Fluorescence levels F o (50 μs), F K (300 μs), F J (2 ms), F I (30 ms), and F P (peak, about 300 ms) were recorded. The OJIP transient has become one of the most popular tools in photosynthetic research (Kalachanis and Manetas 2010;Pang et al 2012;Zhang et al 2011Zhang et al , 2012aZhang et al , 2012b. The shape of the OJIP transient is very sensitive to environmental stresses.…”

Section: Chlorophyll a Fluorescence (Ojip) Transient Measurementmentioning

confidence: 99%

Effects of heat stress on photosynthetic electron transport in a marine cyanobacterium Arthrospira sp.

Zhang

Liu

2015

J Appl Phycol

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Arthrospira (Spirulina) is widely used as human health food and animal feed. In cultures grown outdoors in open ponds, Arthrospira cells are subjected to various environmental stresses, such as high temperature. A better understanding of the effects of high temperature on photosynthesis may help optimize the productivity of Arthrospira cultures. In this study, the effects of heat stress on photosynthetic rate, chlorophyll a fluorescence transients, and photosystem (PS) II, PSI activities in a marine cyanobacterium Arthrospira sp. were examined. Arthrospira cells grown at 25°C were treated for 30 min at 25 (control), 30, 34, 37, or 40°C in the dark. Heat stress (30-37°C) enhanced net photosynthetic O 2 evolution rate. Heat stress caused over-reduction PSII acceptor side, damage of donor side of PSII, decrease in the energetic connectivity of PSII units, and decrease in the performance of PSII. When the temperature changed from 25 to 37°C, PSII activity decreased, while PSI activity increased, the enhancement of photosynthetic O 2 evolution was synchronized with the increase in PSI activity. When temperature was further increased to 40°C, it induced a decrease in photosynthetic O 2 evolution rate and a more severe decrease in PSII activity, but an increase in PSI activity. These results suggest that PSI activity was the decisive factor determining the change of photosynthetic O 2 evolution when Arthrospira was exposed to a temperature from 25 to 37°C, but then, PSII activity became the decisive factor adjusting the change of photosynthetic O 2 evolution when the temperature was increased to 40°C.

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Analysis of fast chlorophyll fluorescence rise (O-K-J-I-P) curves in green fruits indicates electron flow limitations at the donor side of PSII and the acceptor sides of both photosystems

Cited by 23 publications

References 45 publications

Effects of dual stress (high salt and high temperature) on the photochemical efficiency of wheat leaves (Triticum aestivum)

Effects of dual stress (high salt and high temperature) on the photochemical efficiency of wheat leaves (Triticum aestivum)

The Transcriptional Responses and Metabolic Consequences of Acclimation to Elevated Light Exposure in Grapevine Berries

Effects of heat stress on photosynthetic electron transport in a marine cyanobacterium Arthrospira sp.

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