Abstract:
:Tropical plants are sensitive to chilling temperatures above zero but it is still unclear whether photosystem I (PSI) or photosystem II (PSII) of tropical plants is mainly affected by chilling temperatures. In this study, the effect of 4 degrees C associated with various light densities on PSII and PSI was studied in the potted seedlings of four tropical evergreen tree species grown in an open field, Khaya ivorensis, Pometia tomentosa, Dalbergia odorifera, and Erythrophleum guineense. After 8 h chilling exposure at the different photosynthetic flux densities of 20, 50, 100, 150 micromol m(-2) s(-1), the maximum quantum yield of PSII (F (v) /F (m)) in all of the four species decreased little, while the quantity of efficient PSI complex (P (m)) remained stable in all species except E. guineense. However, after chilling exposure under 250 micromol m(-2) s(-1) for 24 h, F (v) /F (m) was severely photoinhibited in all species whereas P (m) was relative stable in all plants except E. guineense. At the chilling temperature of 4 degrees C, electron transport from PSII to PSI was blocked because of excessive reduction of primary electron acceptor of PSII. F (v) /F (m) in these species except E. guineense recovered to approximately 90% after 8 h recovery in low light, suggesting the dependence of the recovery of PSII on moderate PSI and/or PSII activity. These results suggest that PSII is more sensitive to chilling temperature under the moderate light than PSI in tropical trees, and the photoinhibition of PSII and closure of PSII reaction centers can serve to protect PSI.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Huang W,Zhang SB,Cao KFdoi
10.1007/s11120-010-9539-7subject
Has Abstractpub_date
2010-03-01 00:00:00pages
175-82issue
3eissn
0166-8595issn
1573-5079journal_volume
103pub_type
杂志文章abstract::Photosynthesis was well-established on the earth at least 3.5 thousand million years ago, and it is widely believed that these ancient organisms had similar metabolic capabilities to modern cyanobacteria. This requires that development of two photosystems and the oxygen evolution capability occurred very early in the...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:
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pub_type: 杂志文章
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/B:PRES.0000011919.35309.5e
更新日期:2004-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032823
更新日期:1993-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-013-9878-2
更新日期:2013-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-011-9622-8
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/BF00033128
更新日期:1990-12-01 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:1992-04-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 传,历史文章,杂志文章
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更新日期:2014-05-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-004-7174-x
更新日期:2005-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00018219
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00033446
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journal_title:Photosynthesis research
pub_type: 杂志文章
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journal_title:Photosynthesis research
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更新日期:1994-07-01 00:00:00
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journal_title:Photosynthesis research
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pub_type: 杂志文章
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