PMID- 12387399
OWN - NLM
STAT- MEDLINE
DCOM- 20030221
LR  - 20190714
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 36
IP  - 20
DP  - 2002 Oct 15
TI  - Investigation into the importance of the stomatal pathway in the exchange of PCBs 
      between air and plants.
PG  - 4282-7
AB  - The transfer of persistent organic pollutants (POPs) from air to vegetation is an 
      important air-surface exchange process that affects global cycling and can result 
      in human and wildlife exposure via the terrestrial food chain. To improve 
      understanding of this process, the role of stomata in uptake of gas-phase 
      polychlorinated biphenyls (PCBs) was investigated using Hemerocallis x hybrida 
      "Black Eyed Stella", a plant with a high stomatal density. Uptake of PCBs was 
      monitored over a 72-h period in the presence and absence of light. Uptake rates 
      were significantly greater in illuminated (stomata open) plants than 
      unilluminated (stomata closed) plants for 18 of the 28 measured PCB congeners (p 
      < 0.05). Depuration of PCBs was monitored in a subsequent experiment over a 
      period of 3 weeks. Levels after 3 weeks of depuration time were still much higher 
      than the concentration prior to contamination. Tri- and tetrachlorinated PCBs 
      showed the greatest depuration, with less than 20% and 50% of accumulated PCBs 
      respectively remaining, while approximately 70% of higher chlorinated PCB 
      congeners remained in the plants at the end of the experiment. Treatments 
      with/without light (to control stomatal opening during uptake) and with/without 
      abscisic acid (ABA) application (to control stomatal opening during depuration) 
      were compared. After contamination indoors for 3 days, there was a significantly 
      higher concentration of PCBs (p < 0.05) in the light contaminated plants than the 
      dark-contaminated plants for 13 of the 28 measured PCB congeners. The ABA 
      treatment affected depuration of PCB-18 only. "Light/ABA-treated" plants had a 
      significantly slower depuration rate for PCB-18 than "light/untreated", 
      "dark/ABA-treated", and "dark/untreated" plants (p < 0.05). The results of the 
      study indicate that there is a stomatal effect on the rate of exchange of PCBs 
      between Hemerocallis leaves and air.
FAU - Barber, Jonathan L
AU  - Barber JL
AD  - Department of Environmental Sciences, Institute of Environmental and Natural 
      Sciences, Lancaster University, UK. j.l.barber@lancaster.ac.uk
FAU - Kurt, Perihan B
AU  - Kurt PB
FAU - Thomas, Gareth O
AU  - Thomas GO
FAU - Kerstiens, Gerhard
AU  - Kerstiens G
FAU - Jones, Kevin C
AU  - Jones KC
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Environmental Pollutants)
RN  - DFC2HB4I0K (Polychlorinated Biphenyls)
SB  - IM
MH  - Environmental Monitoring
MH  - Environmental Pollutants/*analysis
MH  - *Food Chain
MH  - Hemerocallis/chemistry
MH  - Light
MH  - Plant Leaves/chemistry
MH  - Polychlorinated Biphenyls/analysis/*chemistry
MH  - Volatilization
EDAT- 2002/10/22 04:00
MHDA- 2003/02/22 04:00
CRDT- 2002/10/22 04:00
PHST- 2002/10/22 04:00 [pubmed]
PHST- 2003/02/22 04:00 [medline]
PHST- 2002/10/22 04:00 [entrez]
AID - 10.1021/es025623m [doi]
PST - ppublish
SO  - Environ Sci Technol. 2002 Oct 15;36(20):4282-7. doi: 10.1021/es025623m.