Relationship of ozone exposure and leaf ontogeny to susceptibility of eastern cottonwood to four pests
Thesis/Dissertation
·
OSTI ID:6599570
The aim of this research was to determine if ozone exposure would alter the susceptibility of eastern cottonwood (Populus deltoides Bartr.) to four common pests (biotic stresses) which exploit leaf resources in different ways. Two clones of P. deltoides were exposed to 0.20 ppm ozone, or charcoal-filtered air, for five hours in greenhouse or field exposure chambers. Forty hours after ozone exposure, leaf material was exposed to Melampsora medusae Thum. (biotrophic rust fungus), Marssonina brunnea (Ell. and Ev.) P. Magn. (necrotrophic fungus), Plagiodera versicolora Laich. (chewing insect) or Chaitophorus populicola Thomas (sucking insect) in a series of leaf disk, intact leaf, or whole-plant bioassays. Plant growth parameters were also measured before and after exposure. The ozone dose did not result in changes of plant growth, or in the production of foliar lesions on any leaves which were bioassayed.
- Research Organization:
- Yale Univ., New Haven, CT (USA)
- OSTI ID:
- 6599570
- Country of Publication:
- United States
- Language:
- English
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