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Response of White Clover to Ozone in Different Environments
Author(s) -
Heagle Allen S.,
Reinert Richard A.,
Miller Joseph E.
Publication year - 1996
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1996.00472425002500020010x
Subject(s) - greenhouse , trifolium repens , forage , horticulture , chlorophyll , zoology , agronomy , biology , botany , chemistry
The value of research on effects of O 3 done in greenhouse or field exposure systems is often questioned because chamber environments may affect plant response. Foliar injury, chlorophyll, and forage weight responses of two clones of white clover ( Trifolium repens L.) to ambient O 3 were compared for plants grown in charcoal‐filtered (CF) and nonfiltered air (NF) in greenhouse and open‐top field chambers and in ambient air (AA) plots at Raleigh, NC. One clone is sensitive to O 3 (NC‐S), whereas the other is resistant (NC‐R). Comparisons of individual clone responses in CF vs. NF treatments in the greenhouse and in the field and the proportional response of the clones (defined as the NC‐S/NC‐R response ratio) were used to indicate the relative response to O 3 in the different environments. Foliar injury and chlorophyll responses of NC‐S to O 3 were similar in the NF greenhouse, NF open‐top chambers, and in AA. However, for individual harvests, the percentage decrease in NC‐S forage weight in NF compared with CF was 7 to 23% greater in the greenhouse than in open‐top chambers. The NC‐S/NC‐R forage ratios indicated that clover response to O 3 in NF open‐top field chambers was the same as in AA. Large environmental differences between greenhouse and open‐top chambers apparently caused differences in plant responses to O 3 , whereas relatively small environmental differences between open‐top chambers and ambient air did not.