Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance

Upon a sudden transition from low to high light, electrons transported from photosystem II (PSII) to PSI should be rapidly consumed by downstream sinks to avoid the over-reduction of PSI. However, the over-reduction of PSI under fluctuating light might be accelerated if primary metabolism is restric...

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Autores principales:	Ting-Yu Li, Qi Shi, Hu Sun, Ming Yue, Shi-Bao Zhang, Wei Huang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	electron transport fluctuating light photosynthesis photosystem I stomatal conductance Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/5382c2c60e2f46d7ba1b5a317d6515dc
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spelling	oai:doaj.org-article:5382c2c60e2f46d7ba1b5a317d6515dc2021-11-25T17:11:48ZDiurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance10.3390/cells101131282073-4409https://doaj.org/article/5382c2c60e2f46d7ba1b5a317d6515dc2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4409/10/11/3128https://doaj.org/toc/2073-4409Upon a sudden transition from low to high light, electrons transported from photosystem II (PSII) to PSI should be rapidly consumed by downstream sinks to avoid the over-reduction of PSI. However, the over-reduction of PSI under fluctuating light might be accelerated if primary metabolism is restricted by low stomatal conductance. To test this hypothesis, we measured the effect of diurnal changes in stomatal conductance on photosynthetic regulation under fluctuating light in tomato (<i>Solanum lycopersicum</i>) and common mulberry (<i>Morus alba</i>). Under conditions of high stomatal conductance, we observed PSI over-reduction within the first 10 s after transition from low to high light. Lower stomatal conductance limited the activity of the Calvin–Benson–Bassham cycle and aggravated PSI over-reduction within 10 s after the light transition. We also observed PSI over-reduction after transition from low to high light for 30 s at the low stomatal conductance typical of the late afternoon, indicating that low stomatal conductance extends the period of PSI over-reduction under fluctuating light. Therefore, diurnal changes in stomatal conductance significantly affect the PSI redox state under fluctuating light. Moreover, our analysis revealed an unexpected inhibition of cyclic electron flow by the severe over-reduction of PSI seen at low stomatal conductance. In conclusion, stomatal conductance can have a large effect on thylakoid reactions under fluctuating light.Ting-Yu LiQi ShiHu SunMing YueShi-Bao ZhangWei HuangMDPI AGarticleelectron transportfluctuating lightphotosynthesisphotosystem Istomatal conductanceBiology (General)QH301-705.5ENCells, Vol 10, Iss 3128, p 3128 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	electron transport fluctuating light photosynthesis photosystem I stomatal conductance Biology (General) QH301-705.5
spellingShingle	electron transport fluctuating light photosynthesis photosystem I stomatal conductance Biology (General) QH301-705.5 Ting-Yu Li Qi Shi Hu Sun Ming Yue Shi-Bao Zhang Wei Huang Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance
description	Upon a sudden transition from low to high light, electrons transported from photosystem II (PSII) to PSI should be rapidly consumed by downstream sinks to avoid the over-reduction of PSI. However, the over-reduction of PSI under fluctuating light might be accelerated if primary metabolism is restricted by low stomatal conductance. To test this hypothesis, we measured the effect of diurnal changes in stomatal conductance on photosynthetic regulation under fluctuating light in tomato (<i>Solanum lycopersicum</i>) and common mulberry (<i>Morus alba</i>). Under conditions of high stomatal conductance, we observed PSI over-reduction within the first 10 s after transition from low to high light. Lower stomatal conductance limited the activity of the Calvin–Benson–Bassham cycle and aggravated PSI over-reduction within 10 s after the light transition. We also observed PSI over-reduction after transition from low to high light for 30 s at the low stomatal conductance typical of the late afternoon, indicating that low stomatal conductance extends the period of PSI over-reduction under fluctuating light. Therefore, diurnal changes in stomatal conductance significantly affect the PSI redox state under fluctuating light. Moreover, our analysis revealed an unexpected inhibition of cyclic electron flow by the severe over-reduction of PSI seen at low stomatal conductance. In conclusion, stomatal conductance can have a large effect on thylakoid reactions under fluctuating light.
format	article
author	Ting-Yu Li Qi Shi Hu Sun Ming Yue Shi-Bao Zhang Wei Huang
author_facet	Ting-Yu Li Qi Shi Hu Sun Ming Yue Shi-Bao Zhang Wei Huang
author_sort	Ting-Yu Li
title	Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance
title_short	Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance
title_full	Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance
title_fullStr	Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance
title_full_unstemmed	Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance
title_sort	diurnal response of photosystem i to fluctuating light is affected by stomatal conductance
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5382c2c60e2f46d7ba1b5a317d6515dc
work_keys_str_mv	AT tingyuli diurnalresponseofphotosystemitofluctuatinglightisaffectedbystomatalconductance AT qishi diurnalresponseofphotosystemitofluctuatinglightisaffectedbystomatalconductance AT husun diurnalresponseofphotosystemitofluctuatinglightisaffectedbystomatalconductance AT mingyue diurnalresponseofphotosystemitofluctuatinglightisaffectedbystomatalconductance AT shibaozhang diurnalresponseofphotosystemitofluctuatinglightisaffectedbystomatalconductance AT weihuang diurnalresponseofphotosystemitofluctuatinglightisaffectedbystomatalconductance
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Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance

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