Linked Life Data

11520875

Source:http://linkedlifedata.com/resource/pubmed/id/11520875

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
362
pubmed:dateCreated
2001-8-24
pubmed:abstractText
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. CO(2) 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 O(2) (2%) and saturated CO(2) (1300 micromol mol(-1)) conditions. A single curvilinear relationship was found between true quantum yield for CO(2) 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 CO(2) 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 CO(2) assimilation and photorespiration in different N leaves in response to intercellular CO(2) concentration (C(i)) under normal O(2) conditions. Both the rate of non-cyclic electron flow and the rate of electron flow to CO(2) or O(2) increased with increasing leaf N at any given C(i). The percentage of non-cyclic electron flow to CO(2) assimilation, however, remained the same regardless of leaf N content. As C(i) increased, the percentage of non-cyclic electron flow to CO(2) assimilation increased. In conclusion, the relationship between PSII quantum efficiency and quantum yield for CO(2) assimilation and the partitioning of electron flow between CO(2) assimilation and photorespiration are not affected by N content in apple leaves.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0022-0957
pubmed:author
pubmed:issnType
Print
pubmed:volume
52
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1865-72
pubmed:dateRevised
2003-11-14
pubmed:meshHeading
pubmed-meshheading:11520875-Carbon Dioxide, pubmed-meshheading:11520875-Cell Respiration, pubmed-meshheading:11520875-Chlorophyll, pubmed-meshheading:11520875-Electron Transport, pubmed-meshheading:11520875-Fluorescence, pubmed-meshheading:11520875-Light, pubmed-meshheading:11520875-Light-Harvesting Protein Complexes, pubmed-meshheading:11520875-Malus, pubmed-meshheading:11520875-Nitrogen, pubmed-meshheading:11520875-Oxygen Consumption, pubmed-meshheading:11520875-Photosynthesis, pubmed-meshheading:11520875-Photosynthetic Reaction Center Complex Proteins, pubmed-meshheading:11520875-Photosystem II Protein Complex, pubmed-meshheading:11520875-Plant Leaves, pubmed-meshheading:11520875-Regression Analysis, pubmed-meshheading:11520875-Ribulose-Bisphosphate Carboxylase, pubmed-meshheading:11520875-Trees
pubmed:year
2001
pubmed:articleTitle
The relationship between photosystem II efficiency and quantum yield for CO(2) assimilation is not affected by nitrogen content in apple leaves.
pubmed:affiliation
Department of Horticulture, 134A Plant Science Building, Cornell University, Ithaca, NY 14853-4203, USA. LC89@Cornell.edu
pubmed:publicationType
Journal Article