Ranunculus asiaticus L. is an ornamental species grown in many areas of the world for tubers, potted plants, and cut flowers production. In Italy, the crops of Ranunculus hybrids are mainly located in Liguria region, where virus diseases represent a serious problem in cut flower production, however the impact of virus infections on the crop was not deeply evaluated. For this reason, in 2005-2007, two hundred samples of Ranunculus hybrids collected in Sanremo area (Imperia province) were examined to verify the presence of viruses associated to severe symptoms on leaves (chlorosis, mosaic, “parsley-like” appearance, vein-yellowing, necrotic spots and rings on the lamina; petiol and stem necrosis) and flowers (colour breaking, malformations), stunting and/or prematurely death of plants. By applying virological tests (mechanical inoculations on herbaceous plants, electron microscopy, PAS-ELISA, IME “decoration”, and RT-PCR) several virus species of different lengths (from 700 to 800 nm) and sizes (from 30 to 90-100 nm) singly or in mixed infections were detected. CMV, in a few cases alone, more often in combination with TSWV was identified in plants showing leaf mosaic, necrosis, stunting and severe flowers symptoms. Both TSWV and INSV, in some cases with also PVY-Ranunculus strain, were detected in leaves with mosaic, stem and petiole necrosis, and “parsley-like” symptoms. TuMV and other unidentified potyvirus-like viruses were also found. Data obtained clearly show not only the high diffusion of different species of viruses in Ranunculus crops in Sanremo area, but also that the correlation between symptom expression and virus presence is very difficult. Considering the increasing of economic damages to cut flower production recently observed in this area, control measures to prevent virus spreading are required, such as monitoring and virus-testing programs for a rapid removal of inoculum sources and large-scale indexing of propagation materials.

Recent findings on viruses infecting ranunculus hybrids in Liguria (Italy).

BERTACCINI, ASSUNTA;BELLARDI, MARIA GRAZIA
2011

Abstract

Ranunculus asiaticus L. is an ornamental species grown in many areas of the world for tubers, potted plants, and cut flowers production. In Italy, the crops of Ranunculus hybrids are mainly located in Liguria region, where virus diseases represent a serious problem in cut flower production, however the impact of virus infections on the crop was not deeply evaluated. For this reason, in 2005-2007, two hundred samples of Ranunculus hybrids collected in Sanremo area (Imperia province) were examined to verify the presence of viruses associated to severe symptoms on leaves (chlorosis, mosaic, “parsley-like” appearance, vein-yellowing, necrotic spots and rings on the lamina; petiol and stem necrosis) and flowers (colour breaking, malformations), stunting and/or prematurely death of plants. By applying virological tests (mechanical inoculations on herbaceous plants, electron microscopy, PAS-ELISA, IME “decoration”, and RT-PCR) several virus species of different lengths (from 700 to 800 nm) and sizes (from 30 to 90-100 nm) singly or in mixed infections were detected. CMV, in a few cases alone, more often in combination with TSWV was identified in plants showing leaf mosaic, necrosis, stunting and severe flowers symptoms. Both TSWV and INSV, in some cases with also PVY-Ranunculus strain, were detected in leaves with mosaic, stem and petiole necrosis, and “parsley-like” symptoms. TuMV and other unidentified potyvirus-like viruses were also found. Data obtained clearly show not only the high diffusion of different species of viruses in Ranunculus crops in Sanremo area, but also that the correlation between symptom expression and virus presence is very difficult. Considering the increasing of economic damages to cut flower production recently observed in this area, control measures to prevent virus spreading are required, such as monitoring and virus-testing programs for a rapid removal of inoculum sources and large-scale indexing of propagation materials.
Restuccia P.; G. Mancini; A. Bertaccini; M.G. Bellardi
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/107239
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