Photosynthesis Decrease and Stomatal Control of Gas Exchange in Abies alba Mill. in Response to Vapor Pressure Difference

Publisher Website
Google Scholar
Abstract
The response of steady state CO2 assimilation rate (A), transpiration rate (E), and stomatal conductance (gs) to changes in lead-to-air vapor pressure difference (.DELTA.W) were examined on different dates in shoots from Abies alba trees growing outside. In Ecouves, a provenace representative of wet oceanic conditions in Northern France, both A and gs decreased when .DELTA.W was increased from 4.6 to 14.5 Pa KPa-1. In Nebias, which represented the dry end of the natural range of A. alba in southern France, A and gs decreased only after reaching peak levels at 9.0 and 7.0 Pa KPa-1, respectively. The representation of the data in assimilation rate (A) versus intercellular CO2 partial pressure (Ci) graphs allowed us to determine how stomata and mesophyll photosynthesis interacted when .DELTA.W was increased. Changes in A were primarily due to alterations in mesophyll photosynthesis. At high .DELTA.W, and especially in Ecouves when soil water deficit prevailed, A declined, while Ci remained approximately constant, which may be interpreted as an adjusted of gs to changes in mesophyll photosynthesis. Such a stomatal control of gas exchange appeared as an alternative to the classical feedforward interpretation of E versus .DELTA.W responses with a peak rate of E. The gas exchange response to .DELTA.W was also characterized by considerable deviations from the optimization theory of IR Cowan and GD Farquhar (1977 Symp Soc Exp Biol 31: 471-505).