Disease Spread of a Popular Soybean Mosaic Virus Strain (SC7) in Southern China and Effects on Two Susceptible Soybean Cultivars

(December 2016 - Vol 99 No 4,  pp. 355-364)

Author(s): Ying-pei Song, Cui Li, Lin Zhao, Adhimoolam Karthikeyan, Na Li, Kai Li, Hai-jian Zhi

 

Soybean is a major crop that has recently faced large reductions in seed yield due to Soybean mosaic virus (SMV) infection in the Yangtze River Valley in China. To successfully implement management strategies for SMV, a knowledge of the spread of the disease and its effects on plants is essential. The incidence of SMV in two soybean cultivars (Nannong86-4 and Nannongcaidou5) was studied in a 2-yr (2009 and 2010) survey. The results indicated that the incidence of infection was higher in 2009 and that the cultivar Nannongcaidou5 showed a high disease incidence of 6.16%. Early infection led to serious damage, influencing the morphological traits. Infected plants at V3 and R1 growth stages showed 40.02% and 48.58% seed coat mottling incidence, respectively, but only 2.16% was observed in R3. V3 refers to the vegetative growth stage when third compound leaves have expanded fully on the main stem. R1 refers to the reproductive growth stage when there is a flower on one of the compound leaves on the main stem. R3 refers to the reproductive growth stage when there is a 5 mm pod on one of four compound leaves uppermost on the main stem. Nannong86-4 showed 1.62% seed transmission incidence, but no seed-transmitted infection was found in Nannongcaidou5. Also, the virus was detected in all parts of immature and mature seeds of Nannong86-4, but not in Nannongcaidou5. In addition, amino acid analysis suggested that the aphid transmission-related motifs of SC7 were DAD in the coat protein (CP), and KLSC and PTK in the helper component protein (HC-Pro). These results are helpful to control SMV in the field especially in the Yangtze River Valley.

 

Keyword(s): aphid transmission related motif, disease spread, seed coat mottling, seed transmission, Soybean mosaic virus

 

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December 2016 - Vol 99 No 4

 

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