New host records for cotton leaf curl Gezira virus : capsicum and melon in Egypt
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New host records for cotton leaf curl Gezira virus: capsicum and melon in Egypt C. Gambley 1
&
J. Cremer 2 & P. Campbell 2 & R. Roach 2 & A. M Abdel-Salam 3
Received: 5 October 2019 / Accepted: 20 December 2019 # Australasian Plant Pathology Society Inc. 2020
Abstract Cotton leaf curl Gezira virus (CLCuGeV), in association with a DNA-beta satellite, is reported as a causal agent of cotton leaf curl disease. This study reports CLCuGeV detection in field samples of Capsicum annuum and Cucumis melo from Egypt and represents an expansion of the virus host range beyond the Malvaceae family to the two plant families, Solanaceae and Cucurbitaceae. Keywords Begomovirus . Beta-satellite . DNA-A . Capsicum annuum . Cucumis melo . Potyvirus . squash leaf curl virus (SqLCV) . zucchini yellow mosaic virus (ZYMV) . papaya ringspot virus (PRSV) . potato virus Y (PVY) Begomoviruses are considered one of the major emerging viral threats to crop production worldwide (Mansoor et al. 2006; Varma and Malathi 2003). Cotton leaf curl disease (CLCuD) is caused by a complex of different begomoviruses and DNA-beta satellite molecules. The disease was first recorded in Africa in the 1920s, in Pakistan and India during the 1990s and most recently in 2010, in China (Cai et al. 2010). The disease is reported from Pakistan, India, Sudan, Egypt, China, Tanzania, Malawi, Nigeria and South Africa (AbdelSalam 1999; Briddon 2003; Cai et al. 2010; Mansoor et al. 1999; Mansoor et al. 2003; Malathi et al. 2003). CLCuD is responsible for serious economic losses to cotton production in many regions around the world, particularly on the Indian subcontinent. For example, CLCuD cost the Pakistan industry an estimated US$5 billion between 1992 and 1997 (Briddon et al. 2001). In Sudan during the 1950’s the disease caused yield losses of up to 40% (Malathi et al. 2003). The number of begomoviruses causing CLCuD has risen from only a few species in 1992 to at least 30 species in 2008 (Fauquet et al. 2008). This includes cotton leaf curl Gezira
* C. Gambley [email protected] 1
Department of Agriculture and Fisheries, 4 Roessler Ave, Applethorpe, Australia
2
Department of Agriculture and Fisheries, Dutton Park, Brisbane, Australia
3
Department of Plant Pathology, Faculty of Agriculture, Cairo University, Giza 12613, Egypt
virus (CLCuGeV) which was first reported from Africa in 2002 (Idris and Brown 2002; Idris et al. 2005). Other begomoviruses associated with CLCuD such as cotton leaf curl Kokhran virus are known to have vegetable crop hosts such as tomato and capsicum (Nateshan et al. 1996). However, the host status of CLCuGeV amongst nonmalvaceous vegetable crop species was unknown. This study was aimed at investigating solanaceous and cucurbit species as hosts of CLCuGeV. The detection of two new host species of CLCuGeV, capsicum and melon, is reported. A range of vegetable and melon samples were collected from a field trial site in Ashmoun, Egypt, May 2010 and indexed for begomoviruses and associated DNA-beta satellites. The samples incl
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