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Infection in Soybeans and on Multiple Host Plants in Puerto Rico by an Isolate of Cowpea Mild Mottle Virus

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Infection in Soybeans and on Multiple Host Plants in Puerto Rico by an Isolate of Cowpea Mild Mottle Virus University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications: Department of Entomology Entomology, Department of 2014 INFECTION IN SOYBEANS AND ON MULTIPLE HOST PLANTS IN PUERTO RICO BY AN ISOLATE OF COWPEA MILD MOTTLE VIRUS. Jose C. V. Rodrigues University of Puerto Rico, [email protected] Difabachew B. Kondidie University of Nebraska-Lincoln, [email protected] C. Estevez-Jensen University of Puerto Rico E. W. Kitajima Universidade de São Paulo R. M. Huckaba Dow AgroSciences Res. Sta. See next page for additional authors Follow this and additional works at: http://digitalcommons.unl.edu/entomologyfacpub Part of the Entomology Commons Rodrigues, Jose C. V.; Kondidie, Difabachew B.; Estevez-Jensen, C.; Kitajima, E. W.; Huckaba, R. M.; and Foster, John E., "INFECTION IN SOYBEANS AND ON MULTIPLE HOST PLANTS IN PUERTO RICO BY AN ISOLATE OF COWPEA MILD MOTTLE VIRUS." (2014). Faculty Publications: Department of Entomology. 586. http://digitalcommons.unl.edu/entomologyfacpub/586 This Article is brought to you for free and open access by the Entomology, Department of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications: Department of Entomology by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Authors Jose C. V. Rodrigues, Difabachew B. Kondidie, C. Estevez-Jensen, E. W. Kitajima, R. M. Huckaba, and John E. Foster This article is available at DigitalCommons@University of Nebraska - Lincoln: http://digitalcommons.unl.edu/entomologyfacpub/ 586 Virus Reviews and Research Sociedade Brasileira de Virologia journal homepage: www.vrrjournal.org.br/ Research Article INFECTION IN SOYBEANS AND ON MULTIPLE HOST PLANTS IN PUERTO RICO BY AN ISOLATE OF COWPEA MILD MOTTLE VIRUS. Jose C.V. Rodrigues1*, D. Belay Kondidie2, C. Estevez-Jensen1, E. W. Kitajima3, R.M. Huckaba4, J. E. Foster5 1. University of Puerto Rico, Department of Crops and Environmental Sciences, Agricultural Experimental Station, Center for Excellence in Quarantine & Invasive Species, Botanical Garden South, 1193 Cll Guayacan, San Juan PR 00926, USA. 2. Dow AgroSciences LLC, 18078N 1500E Road Pontiac IL 61764, USA. 3. Departamento de Fitopatologia e Nematologia, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Caixa Postal 9, 13418-900 Piracicaba SP, Brazil 4. Dow AgroSciences Res. Sta. Puerto Rico. 94 Carr. 153, Santa Isabel PR 00757-4004 USA. 5. University of Nebraska-Lincoln, 202 Entomology Hall, Lincoln NE 68583-0816, USA. ABSTRACT Seed companies in the USA grow winter soybean (Glycine max L. Merr.) nurseries in Puerto Rico to advance their breeding programs and seed increase. However, the soybean nurseries are being threatened by a viral disease that cause stunting, leaf and stem necrosis and shoot wilting that leads to death of the whole plant. In the present study transmission assays were conducted using stem grafting, mechanical inoculation, and whiteflies (WFs), Bemisia tabci (Gennadius). Cultivated and wild host plants infested by WFs were surveyed at Dow AgroSciences Research Station and nearby farms at Santa Isabel, Puerto Rico. Based on previous report in Brazil of similar disease caused by an isolate of Cowpea mild mottle virus (CpMMV), a Carlavirus, these samples were screened for the presence of the Carlavirus using enzyme-linked immunosorbent assays (ELISA) and RT-PCR using Carlavirus-specific primers. The results showed that all the transmission assays expressed the viral symptoms on soybean plants on which the tests were done. Out of the 19 plant species surveyed, 8 species gave positive results for the ELISA test. The RT-PCR also successfully amplified a 300 bp fragment from these ELISA positive samples. Additionally, transmission electron microscopy revealed feather-like aggregates of presumed virions in the cytoplasm, characteristic for many members of the genus Carlavirus. This virus infecting soybean and other plants in Puerto Rico is considered an isolate of the CpMMV. This study underlines the importance of controlling WFs and weed species that serve as reservoirs both for the vectors and the virus. Keywords: Carlavirus, Soybeans, RT-PCR, ELISA, virus transmission. Received in May 5, 2014 - Accepted in October 14, 2014 - Published online in October 17, 2014 INTRODUCTION intolerable. Symptoms of leaf vein and stem necrosis and Soybean (Glycine max L. Merrill) is one of the plant stunting were observed in soybean experimental most important crops grown throughout the world plots in the municipalities of Juana Diaz, Santa Isabel, for human consumption, animal feed, oil production, Isabella and Guayanilla, in Puerto Rico. Observations confectionaries, and other purposes. Weeds, insect in a winter nursery in Santa Isabel showed 100 percent pests, and diseases are the major biotic stresses that limit incidence in some soybean lines, indicating the potential soybean production. In recent years attempt has been of damage of this disease in soybeans. Symptoms were made to develop stress tolerant/resistant and high yielding first observed by the senior author in May 2005 and were soybean verities by different biotechnology companies. associated with flower dropping and poor development Soybean is cultivated in Puerto Rico in winter nurseries of the pods. Seeds harvested from infected plants showed to advance breeding programs by several seed companies. severe deformation and reduced weight compared to the However, this effort is being constrained by a virus-like seeds from healthy plants (Rodrigues, unpublished data). disease that cause dwarfing, shoot die back, and stem Whiteflies (WFs) (Homoptera: Aleyrodidae) necrosis of soybean nurseries that makes the damage are one of the most common potential vectors found associated to soybean in Puerto Rico (Perez-Sackett et al., * Corresponding author. 2011). Viral disease associated to similar symptoms and E-mail address: [email protected] transmitted by Bemisia tabaci (Gennadius), on soybeans 2 Rodrigues et al. has been reported from Brazil. Studies conducted to For mechanical inoculation, soybean leaves from virus identify the causal agent indicated that the virus is an infected plants were homogenized in sodium phosphate isolate of Cowpea mild mottle virus, a whitefly-vectored buffer 0.1 M (pH=7.0) (BioBuffer Solutions, Inc. U.S.A.) Carlavirus (Almeida et al., 2005). Similar studies in Iran using mortar and pestle. Then the homogenate was identified a virus that caused mild mosaic symptoms rubbed using carborundum on the upperside of leaves on soybean as an isolate of the CpMMV (Tavasoli et of healthy soybean plants grown on pots. For the stem al., 2009). Soybean is susceptible to infection by several grafting experiment, healthy soybean shoots (scions) viruses, which substantially reduce yield and quality were grafted onto virus infected soybean root stocks. In and it is known that soybean is a natural host for 35 the case of WF mediated transmission, healthy plants potentially important viruses (Edwardson et al., 1991). were grown in a cage and 20 adult WFs that have been CpMMV is one of the 60 different viruses known to be feeding on symptomatic soybean plants were introduced transmitted by B. tabaci (Markam et al., 1994), which can into each cage. In all cases, viral symptoms were recorded cause severe economic losses. starting two to three weeks after transmission attempts. Studies conducted on vectors and hosts of Two hundred seedlings originated from seeds collected Carlavirus indicated that the virus is not transmitted from pods of infected plants were evaluated in greenhouse by aphids that have a similar feeding habit with that of regarding seed transmission of the virus. WFs (Almeida et al., 2005). Moreover, the virus may be Transmission Electron Microscopy. infecting, but is not associated to any visible symptoms in some host plants like Vigna radiata (L.) R. Wilcz, V. Symptomatic soybean leaf tissues from field and aconitifolia (Jacq.) Marechal, and tomato (Lycopersicon experimentally transmitted were pre-fixed in Karnovsky’s esculentum L.) (Tavasoli et al., 2009). fixative and shipped to the microscopy laboratory at Sao According to Iwaki et al. (1982) the transmission of Paulo University, Piracicaba campus, state of São Paulo, putative Carlavirus by WFs is closer to semipersistent Brazil, where they were processed following standard than nonpersistent manner. The source of the virus protocols for transmission electron microscopy (Milne for spreading into crops could be found among plants and Lesemann 1984) in the crop (internal sources) or outside borders Host plant survey and virus detection assays. (external sources) (Harris, 1983). Usually wild plants, volunteers, and perennials may serve as overwintering A total of 18 commonly grown cultivated and or over summering hosts of the virus (Bos, 1981). In the wild plant species were surveyed in DAS and nearby southern Puerto Rico, where soybean winter nurseries farms (Table 1). Leaves of host plants that were found are located, several species of alternate hosts of WFs are infested with WFs were collected in plastic zip lock bags available year round which could serve as permanent that were placed in blue ice and transported to University source of inoculums for the virus into soybean fields. The of Puerto Rico, Agricultural Experimental Station, Rio detection of pathogenic microorganisms within alternate Piedras, where they were processed and analyzed. Plant hosts is important in conducting
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