Comparative physiology of radish populations with differential sensitivity to O sub 3 and SO sub 2
Radish plants (Raphanus sativus L. cv Cherry Belle) were exposed to 0.10 {mu}l l{sup {minus}1} ozone (O{sub 3}) or 0.50 {mu}l l{sup {minus}1} sulfur dioxide (SO{sub 2}) for 4 h d{sup {minus}1}, 3 d wk{sup {minus}1} for 3 weeks. From these fumigated plants, individuals were selected that were resistant or sensitive to these pollutants. The selected plants were used as parental material in a breeding program to produce lines differing in resistance to O{sub 3} and SO{sub 2}. Non-selected (NS) plants from the original populations served as controls. Plants selected for O{sub 3} resistance (O{sub 3}R) weighed significantly more than either plants selected for sensitivity to O{sub 3} (O{sub 3}S) or NS plants when exposed to either O{sub 3} or SO{sub 2}. Plants selected for resistance or sensitivity to SO{sub 2} generally had biomass production similar to that of NS plants. Ozone fumigations tended to decrease free sugar concentrations in leaves at early stages of growth in both O{sub 3}R and O{sub 3}S plants, and caused some accumulations of carbohydrates during late stages of growth in O{sub 3}S plants. Allocation of {sup 14}C was significantly lower to hypocotyls and roots of O{sub 3} fumigated O{sub 3}S plants. Allocation to hypocotyls of O{sub 3}R plants was not affected, although both O{sub 3}R and O{sub 3}S plant groups had lower photosynthetic rates due to O{sub 3} fumigation. Ozone did not significantly affect chlorophyll concentrations in leaves of either sensitive or resistant plants, nor was the time of new leaf production affected by fumigation.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (USA)
- OSTI ID:
- 6519235
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
OZONE
TOXICITY
RADISHES
SENSITIVITY
SULFUR DIOXIDE
AIR POLLUTION
CARBON 14 COMPOUNDS
CHLOROPHYLL
GENETIC VARIABILITY
PLANT GROWTH
TRACER TECHNIQUES
BIOLOGICAL VARIABILITY
CARBOXYLIC ACIDS
CHALCOGENIDES
FOOD
GROWTH
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANTS
POLLUTION
PORPHYRINS
PROTEINS
SULFUR COMPOUNDS
SULFUR OXIDES
VEGETABLES
560300* - Chemicals Metabolism & Toxicology
550501 - Metabolism- Tracer Techniques