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ARS Home » Northeast Area » Beltsville, Maryland (BARC) » Beltsville Agricultural Research Center » National Germplasm Resources Laboratory » Research » Publications at this Location » Publication #362731

Research Project: Characterizing and Detecting Pathogens to Ensure Safe Exchange of Plant Germplasm

Location: National Germplasm Resources Laboratory

Title: Senna bicapsularis: A new natural host of bean yellow mosaic virus in China

item QUI, YUANJIAN - Southwest University
item ZHOU, YANLI - Southwest University
item ZHANG, SONG - Southwest University
item ATTA, SAGHEER - Ghazi University
item LI, MIN - Southwest University
item WU, JIAXING - Southwest University
item Li, Ruhui
item CAO, MENGJI - Southwest University

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/3/2019
Publication Date: 6/11/2019
Citation: Qui, Y., Zhou, Y., Zhang, S., Atta, S., Li, M., Wu, J., Li, R., Cao, M. 2019. Senna bicapsularis: A new natural host of bean yellow mosaic virus in China. Plant Disease.

Interpretive Summary: Yellow candlewood (Senna bicapsularis) is a semi-evergreen shrub in the family Fabaceae that is cultivated in Asia and Europe as a fruit and ornamental tree. In this study, bean yellow mosaic virus (BYMV), a common virus infecting legumes, was found in Senna plants with disease symptoms using high-throughput sequencing. The complete genomic sequence of this new BYMV isolate was determined. The virus was transmitted to cowpea and tobacco by rub inoculations, which helped verify the infections. An additional 37 yellow candlewood plants in the field were tested for BYMV; all 30 plants that had symptoms were positive. This is the first report of BYMV naturally infecting yellow candlewood. The greatest concern, which requires more investigation, is whether the infected plants may serve as a reservoir of the virus for infecting more agriculturally important legume crops because BYMV is often transmitted by aphid insects.

Technical Abstract: Natural infection of bean yellow mosaic virus (BYMV) was identified from yellow candlewood (Senna bicapsularis) with chlorotic and mosaic symptoms by high-throughput sequencing. The complete genomic sequences of this BYMV isolate (SB1) was determined. Sequence analysis showed that SB1 was most closely related to isolate SW9, and phylogenetic analyses grouped it with SW9 and another isolate in subcluster II of BYMV. The virus was transmitted to cowpea (Vigna unguiculate) and tobacco (Nicotiana glutinosa) plants by sap inoculation. A total of 37 more samples were tested by RT-PCR, and results showed that the virus was present in all 30 symptomatic plants. The virus was not detected in 7 asymptomatic trees, indicating the virus infection is closely associated with the disease. To our knowledge, this is the first report of BYMV in this host.