The spring-summer photosynthetic behaviour of Pistacia lentiscus, a spontaneous evergreen bush of the Mediterranean macchia, was followed during two consec- utive years. Outdoor measurements were carried out monthly in the period from May to September in the years 2004 and 2005. Mean values of net photosynthesis (P N )of external tests show a typical daily trend: a rise until the maximum followed by a decline of assimilation with lower values maintained until the end of day. External data were validated by light-response curves, obtained under different thermal regimes in controlled conditions. External trials and measures in controlled conditions confirm an elevated photosynthetic activity below 30 C and a decrease over that limit. The results obtained evidence that the CO 2 assimilation of the P. lentiscus is influenced by stressful temperatures. The ecophysiological response to this limit- ing factor is an adaptation that concentrates on the photo- synthetic activity in the hours of the day and in the periods of the year in which temperatures are more favourable.
Daily and seasonal trends of gas exchange in Pistacia lentiscus L.
Gatti E;Rossi F
2010
Abstract
The spring-summer photosynthetic behaviour of Pistacia lentiscus, a spontaneous evergreen bush of the Mediterranean macchia, was followed during two consec- utive years. Outdoor measurements were carried out monthly in the period from May to September in the years 2004 and 2005. Mean values of net photosynthesis (P N )of external tests show a typical daily trend: a rise until the maximum followed by a decline of assimilation with lower values maintained until the end of day. External data were validated by light-response curves, obtained under different thermal regimes in controlled conditions. External trials and measures in controlled conditions confirm an elevated photosynthetic activity below 30 C and a decrease over that limit. The results obtained evidence that the CO 2 assimilation of the P. lentiscus is influenced by stressful temperatures. The ecophysiological response to this limit- ing factor is an adaptation that concentrates on the photo- synthetic activity in the hours of the day and in the periods of the year in which temperatures are more favourable.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.