Induced resistance to ozone injury of soybean by Tobacco ringspot virus

Reference Report for CAIN789100121

Title:	Induced resistance to ozone injury of soybean by Tobacco ringspot virus
Authors:	Vargo, R.H., Pell, E.J., Smith, S.H.
Source:	Phytopath. 1978, 68(5):715-719
Abstract:	Soyabean cv. Chippewa 64 plants, 12-18 days after sowing, were inoculated with tobacco ringspot virus (TRSV) on one primary leaf at 4, 6, 8 or 10 days before a 4-h exposure to O3 at 697 or 797 mu g/m (0.35 or 0.40 p.p.m.). Primary leaves of virus-inoculated plants became more resistant to O3 injury with increasing time after inoculation. O3 resistance was more closely correlated to extent of TRSV-induced apical necrosis than to time after inoculation. The TRSV-induced apical necrosis required for a significant reduction in O3 sensitivity occurred prior to the detection of virus in the non-inoculated primary leaves. Leaf conductances were similar in primary leaves of virus-infected and non-infected plants before an O3 exposure; during the exposure, conductances decreased more rapidly in infected plants, but conductances of non-infected plants were similar at the end of the 2-h exposure. Although TRSV influenced stomatal response to O3, this effect did not appear to be the primary factor associated with the induced resistance to O3.ADDITIONAL ABSTRACT:Soybean plants, 12-18 days after sowing, were inoculated with TRSV on one primary leaf 4, 6, 8 or 10 days before a 4 h exposure to O3 at 697 or 797 mu g/m (0.35 or 0.4 p.p.m.). Primary leaves of inoculated plants became more resistant to O3 injury with increasing time after inoculation. O3 resistance was more closely correlated to extent of TRSV-induced apical necrosis than to time after inoculation. The apical necrosis required for a significant reduction in O3 sensitivity occurred before virus was detected in the noninoculated primary leaves. Leaf conductances were similar in primary leaves of virus-infected and noninfected plants before an O3 exposure; during the exposure, conductances decreased more rapidly in infected plants, but conductances of noninfected plants were similar at the end of the 2 h exposure. Although TRSV influenced stomatal response to O3, this effect did not appear to be the primary factor associated with the induced resistance to O3.

Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA

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