Comparison of stomatal conductance among clones of Pinus ponderosa exposed to varying levels of ozone
Conference
·
· Plant Physiology, Supplement; (United States)
OSTI ID:5644933
- California State Univ., Chico (USA)
- Lawrence Livermore National Laboratory, CA (USA)
A study has been initiated to investigate the relationship between stomatal conductance and the physiological response of three clones of Pinus ponderosa to continuous long-term ozone exposure. Mature branch tissue from each clone will be exposed to charcoal filtered, ambient, or two times ambient levels of ozone using a branch exposure chamber (BEC). Diurnal measurements of stomatal conductance, transpiration, and photosynthesis will be made seasonally using a LI-6200 portable photosynthesis system (LI-COR Inc., Lincoln, NE). Leaf water potentials will be monitored diurnally using a pressure chamber in conjunction with LI-6200 measurements. Soil moisture will be monitored with a neutron probe and all clones will be irrigated during dry periods. Stomatal conductance, plant water status, and gas exchange parameters will be evaluated to assess (1) the effect of diurnal stomatal conductance on ozone uptake, (2) the effect of prolonged ozone exposure on stomatal responses to environment and (3) the influence of stomatal conductance on among-clone variability in response to ozone.
- OSTI ID:
- 5644933
- Report Number(s):
- CONF-9007196--
- Conference Information:
- Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 93:1
- Country of Publication:
- United States
- Language:
- English
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