Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
Record number 405071
Title Evaluating a new method to estimate the rate of leaf respiration in the light by analysis of combined gas exchange and chlorophyll fluorescence measurements
Author(s) Yin, X.; Sun, Z.; Struik, P.C.; Gu, J.
Source Journal of Experimental Botany 62 (2011)10. - ISSN 0022-0957 - p. 3489 - 3499.
Department(s) Crop and Weed Ecology
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) ribulose-1,5-bisphosphate carboxylase oxygenase - photosynthetic electron-transport - elevated co2 concentration - dark respiration - mesophyll conductance - c-3 photosynthesis - quantum yield - (co2)-c-12 emission - xanthium-strumarium - biochemical-model
Abstract Day respiration (R(d)) is an important parameter in leaf ecophysiology. It is difficult to measure directly and is indirectly estimated from gas exchange (GE) measurements of the net photosynthetic rate (A), commonly using the Laisk method or the Kok method. Recently a new method was proposed to estimate R(d) indirectly from combined GE and chlorophyll fluorescence (CF) measurements across a range of low irradiances. Here this method is tested for estimating R(d) in five C(3) and one C(4) crop species. Values estimated by this new method agreed with those by the Laisk method for the C(3) species. The Laisk method, however, is only valid for C(3) species and requires measurements at very low CO(2) levels. In contrast, the new method can be applied to both C(3) and C(4) plants and at any CO(2) level. The R(d) estimates by the new method were consistently somewhat higher than those by the Kok method, because using CF data corrects for errors due to any non-linearity between A and irradiance of the used data range. Like the Kok and Laisk methods, the new method is based on the assumption that R(d) varies little with light intensity, which is still subject to debate. Theoretically, the new method, like the Kok method, works best for non-photorespiratory conditions. As CF information is required, data for the new method are usually collected using a small leaf chamber, whereas the Kok and Laisk methods use only GE data, allowing the use of a larger chamber to reduce the noise-to-signal ratio of GE measurements
There are no comments yet. You can post the first one!
Post a comment
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.