Skip Navigation

This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (11)
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Cheng, L.
Right arrow Articles by Breen, P. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Cheng, L.
Right arrow Articles by Breen, P. J.
Agricola
Right arrow Articles by Cheng, L.
Right arrow Articles by Breen, P. J.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Experimental Botany, Vol. 52, No. 362, pp. 1865-1872, September 1, 2001
© 2001 Oxford University Press

Original Papers

The relationship between photosystem II efficiency and quantum yield for CO2 assimilation is not affected by nitrogen content in apple leaves

Lailiang Cheng1,3, Leslie H. Fuchigami2 and Patrick J. Breen2

1 Department of Horticulture, 134A Plant Science Building, Cornell University, Ithaca, NY 14853-4203, USA
2 Department of Horticulture, Oregon State University, Corvallis, OR 97331, USA

Bench-grafted Fuji/M.26 apple (Malus domestica Borkh.) trees were fertigated with different concentrations of nitrogen by using a modified Hoagland's solution for 45 d. CO2 assimilation and photosystem II (PSII) quantum efficiency in response to incident photon flux density (PFD) were measured simultaneously in recent fully expanded leaves under low O2 (2%) and saturated CO2 (1300 µmol mol-1) conditions. A single curvilinear relationship was found between true quantum yield for CO2 assimilation and PSII quantum efficiency for leaves with a wide range of leaf N content. The relationship was linear up to a quantum yield of approximately 0.05 mol CO2 mol-1 quanta. It then became curvilinear with a further rise in quantum yield in response to decreasing PFD. This relationship was subsequently used as a calibration curve to assess the rate of non-cyclic electron transport associated with Rubisco and the partitioning of electron flow between CO2 assimilation and photorespiration in different N leaves in response to intercellular CO2 concentration (Ci) under normal O2 conditions. Both the rate of non-cyclic electron flow and the rate of electron flow to CO2 or O2 increased with increasing leaf N at any given Ci. The percentage of non-cyclic electron flow to CO2 assimilation, however, remained the same regardless of leaf N content. As Ci increased, the percentage of non-cyclic electron flow to CO2 assimilation increased. In conclusion, the relationship between PSII quantum efficiency and quantum yield for CO2 assimilation and the partitioning of electron flow between CO2 assimilation and photorespiration are not affected by N content in apple leaves.

Key words: Apple, Malus domestica, CO2 assimilation, electron partitioning, leaf N content, non-photochemical quenching, PSII efficiency, quantum yield.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J Exp BotHome page
C. Wittmann and H. Pfanz
Temperature dependency of bark photosynthesis in beech (Fagus sylvatica L.) and birch (Betula pendula Roth.) trees
J. Exp. Bot., December 1, 2007; 58(15-16): 4293 - 4306.
[Abstract] [Full Text] [PDF]

Home page
 Plant Cell PhysiolHome page
A. Makino, C. Miyake, and A. Yokota
Physiological Functions of the Water-Water Cycle (Mehler Reaction) and the Cyclic Electron Flow around PSI in Rice Leaves
Plant Cell Physiol., September 15, 2002; 43(9): 1017 - 1026.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.