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Article

Molecular Characterization and Disease Control of Stem Canker on Royal Poinciana (Delonix regia) Caused by Neoscytalidium dimidiatum in the United Arab Emirates

by
Seham M. Al Raish
1,
Esam Eldin Saeed
2,
Arjun Sham
1,
Khulood Alblooshi
1,
Khaled A. El-Tarabily
1,2,3,* and
Synan F. AbuQamar
1,*
1
Department of Biology, College of Science, United Arab Emirates University, Al-Ain 15551, UAE
2
Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al-Ain 15551, UAE
3
College of Science, Health, Engineering and Education, Murdoch University, Murdoch, WA 6150, Australia
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(3), 1033; https://doi.org/10.3390/ijms21031033
Submission received: 15 December 2019 / Revised: 24 January 2020 / Accepted: 1 February 2020 / Published: 4 February 2020
(This article belongs to the Special Issue Plant Genomics 2019)
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Abstract

In the United Arab Emirates (UAE), royal poinciana (Delonix regia) trees suffer from stem canker disease. Symptoms of stem canker can be characterized by branch and leaf dryness, bark lesions, discoloration of xylem tissues, longitudinal wood necrosis and extensive gumming. General dieback signs were also observed leading to complete defoliation of leaves and ultimately death of trees in advanced stages. The fungus, Neoscytalidium dimidiatum DSM 109897, was consistently recovered from diseased royal poinciana tissues; this was confirmed by the molecular, structural and morphological studies. Phylogenetic analyses of the translation elongation factor 1-a (TEF1-α) of N. dimidiatum from the UAE with reference specimens of Botryosphaeriaceae family validated the identity of the pathogen. To manage the disease, the chemical fungicides, Protifert®, Cidely® Top and Amistrar® Top, significantly inhibited mycelial growth and reduced conidial numbers of N. dimidiatum in laboratory and greenhouse experiments. The described “apple bioassay” is an innovative approach that can be useful when performing fungicide treatment studies. Under field conditions, Cidely® Top proved to be the most effective fungicide against N. dimidiatum among all tested treatments. Our data suggest that the causal agent of stem canker disease on royal poinciana in the UAE is N. dimidiatum.
Keywords: chemical fungicide; disease control; Neoscytalidium dimidiatum; royal poinciana; stem canker; UAE chemical fungicide; disease control; Neoscytalidium dimidiatum; royal poinciana; stem canker; UAE

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MDPI and ACS Style

Al Raish, S.M.; Saeed, E.E.; Sham, A.; Alblooshi, K.; El-Tarabily, K.A.; AbuQamar, S.F. Molecular Characterization and Disease Control of Stem Canker on Royal Poinciana (Delonix regia) Caused by Neoscytalidium dimidiatum in the United Arab Emirates. Int. J. Mol. Sci. 2020, 21, 1033. https://doi.org/10.3390/ijms21031033

AMA Style

Al Raish SM, Saeed EE, Sham A, Alblooshi K, El-Tarabily KA, AbuQamar SF. Molecular Characterization and Disease Control of Stem Canker on Royal Poinciana (Delonix regia) Caused by Neoscytalidium dimidiatum in the United Arab Emirates. International Journal of Molecular Sciences. 2020; 21(3):1033. https://doi.org/10.3390/ijms21031033

Chicago/Turabian Style

Al Raish, Seham M., Esam Eldin Saeed, Arjun Sham, Khulood Alblooshi, Khaled A. El-Tarabily, and Synan F. AbuQamar. 2020. "Molecular Characterization and Disease Control of Stem Canker on Royal Poinciana (Delonix regia) Caused by Neoscytalidium dimidiatum in the United Arab Emirates" International Journal of Molecular Sciences 21, no. 3: 1033. https://doi.org/10.3390/ijms21031033

APA Style

Al Raish, S. M., Saeed, E. E., Sham, A., Alblooshi, K., El-Tarabily, K. A., & AbuQamar, S. F. (2020). Molecular Characterization and Disease Control of Stem Canker on Royal Poinciana (Delonix regia) Caused by Neoscytalidium dimidiatum in the United Arab Emirates. International Journal of Molecular Sciences, 21(3), 1033. https://doi.org/10.3390/ijms21031033

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