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dc.contributor.authorMaai, Erien
dc.contributor.authorNishimura, Kazusaen
dc.contributor.authorTakisawa, Rihitoen
dc.contributor.authorNakazaki, Tetsuyaen
dc.contributor.alternative間合, 絵里ja
dc.contributor.alternative西村, 和紗ja
dc.contributor.alternative滝澤, 理仁ja
dc.contributor.alternative中﨑, 鉄也ja
dc.date.accessioned2020-11-06T06:49:43Z-
dc.date.available2020-11-06T06:49:43Z-
dc.date.issued2020-
dc.identifier.issn1343-943X-
dc.identifier.issn1349-1008-
dc.identifier.urihttp://hdl.handle.net/2433/255884-
dc.description.abstractPlants are exposed to high light intensity, high leaf temperatures and high air-to-leaf water vapor pressure deficit (ALVPD) during the day. These environmental stresses cause stomatal closure and photoinhibitory damage, leading to midday depression of photosynthesis. Chloroplast positioning is essential for the efficient operation of photosynthesis. However, chloroplast behavior before, during, and even after the midday depression of photosynthesis remains unknown. We investigated changes in the intracellular positioning of chloroplasts and photosynthetic traits under a diurnal pattern of light. Sorghum leaves were exposed to a 12-h regime of light mimicking the natural light environment, with constant leaf temperature and ALVPD. Net photosynthetic rate (Pn) showed a diurnal pattern, and midday depression in Pn was observed at 3.8 h of irradiation. Depression in Pn was attributed to stomatal limitation because the decrease in Pn was in accordance with the decrease in stomatal conductance. The maximum efficiency of photosystem II decreased with the increase in light intensity and remained low after 12 h of irradiation. Bundle sheath chloroplasts swelled after 8 h of irradiation, representing the accumulation of starch. Conversely, mesophyll chloroplasts exhibited avoidance response after 4 h of irradiation, and the avoidance position was maintained during the remainder of the daytime. These data suggest that chloroplasts are subject to light stress during and after the midday depression of photosynthesis. The intensity of natural light is excessive for most of the day and this light stress induces chloroplast avoidance response and depression of photosynthesis.en
dc.format.mimetypeapplication/pdf-
dc.language.isoeng-
dc.publisherTaylor and Francis Ltd.en
dc.rights© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en
dc.subjectChloroplast movementen
dc.subjecthigh lighten
dc.subjectmesophyllen
dc.subjectmidday depression of photosynthesisen
dc.subjectphotoinhibitionen
dc.subjectsorghumen
dc.titleLight stress-induced chloroplast movement and midday depression of photosynthesis in sorghum leavesen
dc.typejournal article-
dc.type.niitypeJournal Article-
dc.identifier.jtitlePlant Production Scienceen
dc.identifier.volume23-
dc.identifier.issue2-
dc.identifier.spage172-
dc.identifier.epage181-
dc.relation.doi10.1080/1343943X.2019.1673666-
dc.textversionauthor-
dc.addressGraduate School of Agriculture, Kyoto Universityen
dc.addressGraduate School of Agriculture, Kyoto Universityen
dc.addressGraduate School of Agriculture, Kyoto Universityen
dc.addressGraduate School of Agriculture, Kyoto Universityen
dcterms.accessRightsopen access-
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