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European Journal of Plant Pathology

, Volume 153, Issue 1, pp 317–323 | Cite as

A Watermelon mosaic virus clone tagged with the yellow visual maker phytoene synthase facilitates scoring infectivity in melon breeding programs

  • Verónica Aragonés
  • Ana Pérez-de-Castro
  • Teresa Cordero
  • Jaime Cebolla-Cornejo
  • Carmelo López
  • Belén Picó
  • José-Antonio DaròsEmail author
Article

Abstract

Watermelon mosaic virus (WMV), a plus-strand RNA virus that belongs to the family Potyviridae, is one of the most damaging viruses that infect cucurbit crops. However, isolates of this species frequently induce mild symptoms, which makes difficult to manage the disease in the field and breeding programs. A new generation of marker genes has been recently developed to visually track plant virus infection. Virus-mediated expression of the Pantoea ananatis phytoene synthase (crtB) induces accumulation in infected tissues of pigmented carotenoids that can be readily detected by the naked eye. Here we investigated whether this visual marker may facilitate visual diagnosis of WMV infection in cucurbits. First, we cloned a mild WMV isolate (WMV-Vera) and built a recombinant clone that expresses crtB (WMV-crtB). Next, we inoculated a series of cucurbit cultivars frequently used in breeding programs. We observed that WMV-mediated expression of crtB helps to visually score infection in two susceptible and highly appreciated melon cultivars, such as Piñonet Piel de Sapo and Vedrantais, but not in susceptible Cucurbita spp. cultivars. An increase in yellow pigmentation was experimentally confirmed in susceptible melon cultivars by measuring the Hue angle using a solid colorimeter. Carotenoid analyses in infected tissues explained why the visual crtB marker performs better in susceptible melon than in Cucurbita spp. cultivars. These results support that the visual marker crtB may facilitate visual diagnosis of WMV infection in melon breeding programs.

Keywords

Watermelon mosaic virus Phytoene synthase Melon Cucurbita Virus diagnosis 

Notes

Funding

This research was supported by grants BIO2014–54269-R, AGL2014–53398-C2–2-R, BIO2017–83184-R, and AGL2017–85563-C2–1-R from the Spanish Ministerio de Ciencia, Innovación y Universidades (co-financed FEDER funds).

Compliance with ethical standards

The authors confirm that this work complies the Ethical Rules applicable for this journal.

Ethical approval

This work does not contain any study with humans or animals.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10658_2018_1621_MOESM1_ESM.doc (1.8 mb)
ESM 1 (DOC 1.75 mb)

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2018

Authors and Affiliations

  • Verónica Aragonés
    • 1
  • Ana Pérez-de-Castro
    • 2
  • Teresa Cordero
    • 1
  • Jaime Cebolla-Cornejo
    • 2
  • Carmelo López
    • 2
  • Belén Picó
    • 2
  • José-Antonio Daròs
    • 1
    Email author
  1. 1.Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas-Universitat Politècnica de València)ValenciaSpain
  2. 2.Instituto de Conservación y Mejora de la Agrodiversidad ValencianaUniversitat Politècnica de ValènciaValenciaSpain

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