Elimination of eight viruses and two viroids from preclonal candidates of six grapevine varieties (Vitis vinifera L.) through in vivo thermotherapy and in vitro meristem tip micrografting

Miljanić, Vanja (author), Rusjan, Denis (author), Škvarč, Andreja (author), Chatelet, Philippe (author), Štajner, Nataša (author)

Viruses and virus-like organisms are amajor problemin viticultureworldwide. They cannot be controlled by standard plant protection measures, and once infected, plants remain infected throughout their life; therefore, the propagation of healthy vegetative material is crucial. In vivo thermotherapy at 36–38 °C for at least six weeks, followed by meristem tip micrografting (0.1–0.2 mm) onto in vitro-growing seedling rootstocks of Vialla (Vitis labrusca × Vitis riparia), was successfully used to eliminate eight viruses (grapevine rupestris stem pitting-associated virus (GRSPaV), grapevine Pinot gris virus (GPGV), grapevine fanleaf virus (GFLV), grapevine leafroll-associated virus 3 (GLRaV-3), grapevine fleck virus (GFkV), grapevine rupestris vein feathering virus (GRVFV), grapevine Syrah virus-1 (GSyV-1), and raspberry bushy dwarf virus (RBDV)), as well as two viroids (hop stunt viroid (HSVd) and grapevine yellow speckle viroid 1 (GYSVd-1)) from preclonal candidates of six grapevine varieties (Vitis vinifera L.). A half-strength MS medium including vitamins supplemented with 30 g/L of sucrose and solidified with 8 g/L of agar, without plant growth regulators, was used for the growth and root development of micrografts and the subsequently micropropagated plants; no callus formation, hyperhydricity, or necrosis of shoot tips was observed. Although the overall regeneration was low (higher in white than in red varieties), a 100% elimination was achieved for all eight viruses, whereas the elimination level for viroids was lower, reaching only 39.2% of HSVd-free and 42.6% GYSVd-1-free vines. To the best of our knowledge, this is the first report of GPGV, GRVFV, GSyV-1, HSVd, and GYSVd-1 elimination through combining in vivo thermotherapy and in vitro meristem tip micrografting, and the first report of RBDV elimination from grapevines. The virus-free vines were successfully acclimatized in rockwool plugs and then transferred to soil.

• Language: English
• Keywords: Vitis vinifera L., grapevine, viruses, viroids, micrografting, thermotherapy
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 14 str.
• Numbering: Vol. 11, iss. 8, art. 1064
• PID: 20.500.12556/RUL-136431
• UDC: 634.8
• ISSN on article: 2223-7747
• DOI: 10.3390/plants11081064
• COBISS.SI-ID: 105430787
• Publication date in RUL: 04.05.2022

Record is a part of a journal

• Title: Plants
• Shortened title: Plants
• Publisher: MDPI
• ISSN: 2223-7747
• COBISS.SI-ID: 523345433

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: vinska trta, virusi, viroidi, termoterapija, cepljenje, tkivne kulture

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0077
• Name: Kmetijske rastline - genetika in sodobne tehnologije

• Funder: Other - Other funder or multiple funders
• Funding programme: Public Scholarship, Development, Disability, and Maintenance Fund of the Republic of Slovenia, Scholarship for nationals of the Western Balkans to postgraduate study in Slovenia