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Nitrogen Dioxide Effects on Photosynthesis in Soybean
Author(s) -
Sabaratnam Sashikala,
Gupta Gian,
Mulchi Charles
Publication year - 1988
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/jeq1988.00472425001700010023x
Subject(s) - photosynthesis , respiration , chemistry , carbon dioxide , respiration rate , glycine , zoology , cultivar , nitrogen dioxide , horticulture , nitrogen , botany , biology , biochemistry , organic chemistry , amino acid
Very little information is available on the effects of nitrogen dioxide (NO 2 ) on photosynthesis in soybean [ Glycine max (L.) Merr.]. This investigation was undertaken to study the effects of NO 2 (0.0, 0.1, 0.2, 0.3, and 0.5 µ L/L) on net photosynthetic rate (PN), stomatal resistance (SR), and dark respiration rate (DR) of soybean cultivar Williams treated 7 h/d, for 5 d in a controlled environment. Measurements of PN, SR, and DR were made both immediately and 24 h after the termination of exposure, using a LICOR 6000 Portable Photosynthesis system. Treatment effects on PN and DR were statistically significant. Increases of 18 and 23% in PN were observed immediately following exposure to 0.2 µ L/L NO 2 and after a 24‐h recovery period. With the 0.5 µ L/L NO 2 treatment reductions in the PN of 23 and 50% were observed immediately after exposure and following the 24‐h recovery period. Dark respiration rates of leaves treated with NO 2 , 0.2 µ L/L, were 13 and 46% higher than the control immediately after the exposure and after the 24 h recovery. Exposure to 0.2 µ L/L of NO 2 had a stimulating effect whereas 0.5 µ L/L of NO 2 inhibited photosynthesis in soybean.