Abstract:
:Moderately high temperature reduces photosynthetic capacities of leaves with large effects on thylakoid reactions of photosynthesis, including xanthophyll conversion in the lipid phase of the thylakoid membrane. In previous studies, we have found that leaf temperature of 40°C increased zeaxanthin accumulation in dark-adapted, intact tobacco leaves following a brief illumination, but did not change the amount of zeaxanthin in light-adatped leaves. To investigate heat effects on zeaxanthin accumulation and decay, zeaxanthin level was monitored optically in dark-adapted, intact tobacco and Arabidopsis thaliana leaves at either 23 or 40°C under 45-min illumination. Heated leaves had more zeaxanthin following 3-min light but had less or comparable amounts of zeaxanthin by the end of 45 min of illumination. Zeaxanthin accumulated faster at light initiation and decayed faster upon darkening in leaves at 40°C than leaves at 23°C, indicating that heat increased the activities of both violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE). In addition, our optical measurement demonstrated in vivo that weak light enhances zeaxanthin decay relative to darkness in intact leaves of tobacco and Arabidopsis, confirming previous observations in isolated spinach chloroplasts. However, the maximum rate of decay is similar for weak light and darkness, and we used the maximum rate of decay following darkness as a measure of the rate of ZE during steady-state light. A simulation indicated that high temperature should cause a large shift in the pH dependence of the amount of zeaxanthin in leaves because of differential effects on VDE and ZE. This allows for the reduction in ΔpH caused by heat to be offset by increased VDE activity relative to ZE.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Zhang R,Kramer DM,Cruz JA,Struck KR,Sharkey TDdoi
10.1007/s11120-011-9672-ysubject
Has Abstractpub_date
2011-09-01 00:00:00pages
171-81issue
2-3eissn
0166-8595issn
1573-5079journal_volume
108pub_type
杂志文章abstract::Photosystem I particles containing 30-40 chlorophyll a molecules per primary electron donor P700 were subjected to 1.5 ps low density laser flashes at 610 nm resulting in excitation of the antenna chlorophyll a molecules followed by energy transfer to P700 and subsequent oxidation of P700. Absorbance changes were moni...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00047947
更新日期:1987-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
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更新日期:2020-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
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更新日期:2009-03-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00040990
更新日期:1996-05-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
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更新日期:1987-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029971
更新日期:1991-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00020071
更新日期:1980-03-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-016-0303-5
更新日期:2017-02-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00047680
更新日期:1988-07-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00018219
更新日期:1996-10-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-011-9712-7
更新日期:2012-02-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-016-0220-7
更新日期:2016-12-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00040708
更新日期:1982-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032785
更新日期:1985-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-014-0047-z
更新日期:2015-08-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-013-9963-6
更新日期:2014-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-018-0498-8
更新日期:2018-08-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00048603
更新日期:1995-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-011-9645-1
更新日期:2011-05-01 00:00:00
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更新日期:2016-05-01 00:00:00
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doi:10.1007/s11120-018-0537-5
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pub_type: 杂志文章
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更新日期:1990-03-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-014-0064-y
更新日期:2016-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章,评审
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更新日期:2018-12-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00016274
更新日期:1993-05-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00014592
更新日期:1994-03-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00018272
更新日期:1987-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
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更新日期:2011-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-005-1447-x
更新日期:2005-11-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
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更新日期:1991-03-01 00:00:00