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Stomata from growth‐chamber‐grown Vicia faba have an enhanced sensitivity to CO 2 *
Author(s) -
TALBOTT L. D.,
SRIVASTAVA A.,
ZEIGER E.
Publication year - 1996
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1996.tb00434.x
Subject(s) - vicia faba , photosynthesis , respiration , aperture (computer memory) , greenhouse , botany , horticulture , chemistry , analytical chemistry (journal) , biology , physics , environmental chemistry , acoustics
Abaxial stomata from Vicia faba leaves grown in a growth chamber under constant light, temperature and humidity showed an elaborate pattern of aperture changes over the course of a light cycle. These aperture changes were tightly correlated with changes in chamber CO 2 concentration (r 2 =0.83). Changes in chamber [CO 2 ] resulted, in turn, from substantial daily fluctuations in ambient [CO 2 ], typical of the Los Angeles environment with a constant offset caused by photosynthesis and respiration of the plants within the chamber. The dominant role of the stomatal response to CO 2 in the control of aperture was confirmed by manipulation of chamber [CO 2 ]. Fast (15 min) increases and decreases in [CO 2 ] caused rapid decreases and increases in aperture, while constant |CO 2 ] resulted in constant aperture. In contrast, aperture changes in comparable plants grown under greenhouse conditions were tightly correlated with changes in incident solar radiation (r 2 =0.80), and poorly correlated with changes in [CO 2 ] (r 2 =0.09). Greenhouse‐grown plants transferred to growth chamber conditions showed no apparent response to CO 2 . These data indicate that growth‐chamber‐grown V, faba leaves provide an experimental system optimally suited for the study of the stomatal response to CO 2 , and suggest that acclimation to environmental conditions alters the sensitivity of stomata to CO 2 .