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Effect of Temperature on the Expression of Necrosis in Soybean Infected with Soybean mosaic virus

^a Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, Fayetteville, AR 72701
^b Dep. of Plant Pathology, Univ. of Arkansas, Fayetteville, AR 72701

View larger version (105K): [in a new window]   Fig. 1. Impact of temperature on the expression of the stem-tip necrotic reaction in plants inoculated by Soybean mosaic virus (SMV). (a) Soybean genotype V262 (Rsv1-n) at 10°C 44 days after inoculation (DAI); 1 = healthy plants, 2 = plants inoculated with G1. (b) Soybean genotype V94-3971 (Rsv1) at 10°C 44 DAI; 1 = healthy plants, 2 = plants inoculated with G7. (c) Soybean genotype V262 (Rsv1-n) at 25°C 8 DAI; 1 = healthy plants, 2 = plants inoculated with G1. (d) Soybean genotype V94-3971 (Rsv1) at 25°C 8 DAI; 1 = healthy plants, 2 = plants inoculated with G7. (e) V262 (Rsv1-n) at 25°C 8 DAI; 1 = leaf from healthy plant, 2 = leaf from plant inoculated with G1 expressing stem tip necrosis. (f) V94-3971 (Rsv1) at 25°C 8 DAI; 1 = leaf from healthy plant, 2 = leaf from plant inoculated with G7 expressing stem tip necrosis.

View larger version (90K): [in a new window]   Fig. 2. Threshold temperature for the expression switch between stem-tip necrosis and mosaic symptoms in soybean genotypes inoculated with two Soybean mosaic virus strains. (a) Soybean genotype V262 (Rsv1-n) at 32°C 7 days after inoculation (DAI); 1 = healthy plants, 2 = plants inoculated with G1. (b) Soybean genotype V94-3971 (Rsv1) at 32°C 7 DAI; 1 = healthy plants, 2 = plants inoculated with G7. (c) Soybean genotype V262 (Rsv1-n) at 33°C 12 DAI; 1 = healthy plants, 2 = plants inoculated with G1. (d) Soybean genotype V94-3971 (Rsv1) at 33°C 12 DAI; 1 = healthy plants, 2 = plants inoculated with G7. (e) V262 (Rsv1-n) at 33°C 12 DAI; 1 = leaf from healthy plant, 2 = leaf from plant inoculated with G1 expressing mosaic symptom. (f) V94-3971 (Rsv1) at 33°C 12 DAI; 1 = leaf from healthy plant, 2 = leaf from plant inoculated with G7 expressing mosaic symptom.

View larger version (86K): [in a new window]   Fig. 3. Impact of alternating temperatures on symptom expression in soybean induced by Soybean mosaic virus. (a) Soybean genotype V262 (Rsv1-n) at 33°C day/20°C night 7 days after inoculation (DAI); 1 = healthy plants, 2 = inoculated with G1. (b) Soybean genotype V262 (Rsv1-n) at 33°C day/20°C night 14 DAI; 1 = healthy plants, 2 = inoculated with G1. (c) Soybean genotype V94-3971 (Rsv1) at 33°C day/20°C night 7 DAI; 1 = healthy plants, 2 = inoculated with G7. (d) Soybean genotype V94-3971 (Rsv1) at 33°C day/20°C night 14 DAI; 1 = healthy plants, 2 = inoculated with G7. (e) Soybean genotype V262 (Rsv1-n) at 35°C day/20°C night 8 DAI; 1 = healthy plants, 2 = inoculated with G1. (f) Soybean genotype V94-3971 (Rsv1) at 35°C day/20°C night 8 DAI; 1 = healthy plants, 2 = inoculated with G7.