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Temperature response of parameters of a biochemically based model of photosynthesis. I. Seasonal changes in mature maritime pine ( Pinus pinaster Ait.) by B. E. Medlyn; D. Loustau; S. Delzon is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract Responses of plant processes to temperature may vary according to the time scale on which they are measured. In this study, both short‐term and seasonal responses of photosynthesis to temperature were examined. A field study of seasonal changes in the temperature response of photosynthesis was conducted on two provenances, French and Moroccan, of mature maritime pine (__Pinus pinaster__ Ait.). Measurements were made every 2 months over a 1‐year period and used to parameterize a mechanistic model of photosynthesis. Temperature responses of maximum Rubisco activity, __V__~cmax~, and potential electron transport rate, __J__~max~, were obtained for each measurement period, as was the response of stomatal conductance, __g__~s~, to water vapour pressure deficit (VPD). Absolute values of __V__~cmax~ and __J__~max~ at 25 °C were related to needle nitrogen content, __N__~area.~__N__~area~, and thus __V__~cmax~ and __J__~max~, were negatively correlated with the mean minimum temperature in the month preceding measurements. The ratio of __J__~max~ : __V__~cmax~ at 25 °C varied between 1 and 1·7 but did not show any seasonal trend. Nor was there any seasonal trend in the relative t

Who reads Temperature response of parameters of a biochemically based model of photosynthesis. I. Seasonal changes in mature maritime pine ( Pinus pinaster Ait.)?

Author

B. E. Medlyn; D. Loustau; S. Delzon

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0140-7791)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)