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Comparison of shoot tip culture and cryotherapy for eradication of ampeloviruses associated with Pineapple mealybug wilt in wild varieties

  • Plant Tissue Culture
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Abstract

The Pineapple mealybug wilt-associated virus (PMWaV) provokes a disease that causes considerable losses to pineapple growers due to the reduced leaf tissue turgescence, resulting in leaf necrosis and death in severe cases. In this work, we describe the comparison of shoot tip culture and cryotherapy methods to eradicate the pineapple wilt disease-associated ampeloviruses. Plants from the accessions Ananas comosus var. comosus (AGB-009), var. bracteatus (AGB-119), and var. parguazensis (AGB-376) were indexed by RT-PCR, confirming mixed infections of PMWaV-1, PMWaV-2, and PMWaV-3. The accessions were cultured in vitro and their shoot tips treated by cryotherapy following a droplet vitrification protocol. The regeneration rate from shoot tip culture was 93% for AGB-376 and 100% for the other two accessions. After freezing, AGB-376 had 100% regeneration subsequent to exposure to PVS2 for 45 min, followed by 95% for AGB-009, while for AGB-119 the optimal exposure time was 60 min, with plant regeneration from nearly 80% of the shoot tips. For the accessions AGB-009 and AGB-376, all the recovered plants were virus free by the two methods, while 50% of the plants from accession AGB-119 remained infected. These results indicate that shoot tip culture alone or in association with cryotherapy is a promising routine method for virus removal from pineapple plant tissues and is useful to ensure that backup reserves of pineapple germplasm, conserved by in vitro bank and cryobank, are formed with virus-free plants.

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Acknowledgments

We thank Embrapa-CNPMF for the infrastructure and technical support.

Funding

This work received support from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (407136-2016-9 and 304269/2018-2), Fundação de Amparo a Pesquisa do Estado da Bahia (APP0040/2016), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES 001, CAPES/ Embrapa, UFRB/PNPD - 88882.315208/2019-01, PROCAD - 88887.124186/2014-00) through the scholarships granted.

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PAG, DASM, and RSO contribute to acquisition, analysis, and interpretation of data. EHS and ECA contributed to analysis and interpretation of data and writing and revision of the manuscript. FVDS contributed to conception and design of the experiment and to writing and revising the manuscript. All authors read and approved the final manuscript.

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Correspondence to Fernanda Vidigal Duarte Souza.

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The authors declare they have no conflicts of interest.

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Editor: Barbara Reed

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Guerra, P.A., de Souza, E.H., de Andrade, E.C. et al. Comparison of shoot tip culture and cryotherapy for eradication of ampeloviruses associated with Pineapple mealybug wilt in wild varieties. In Vitro Cell.Dev.Biol.-Plant 56, 903–910 (2020). https://doi.org/10.1007/s11627-020-10100-0

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  • DOI: https://doi.org/10.1007/s11627-020-10100-0

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