Characterization of 16SrII-D subgroup associated phytoplasmas in new host plants in Egypt. (15th June 2017)

• Record Type: Journal Article
• Authors: El-Sisi, Yasmen; Omar, Ayman F.; Sidaros, Samir A.; ElSharkawy, Mohsen M.
• Is Part Of: Archives of phytopathology and plant protection. Volume 50:Number 9/10(2017)
• Page Start: 504
• Page End: 513
• Publication Date: 2017-06-15
• Subjects: 16SrII group phytoplasma -- Egypt -- onion -- Opuntia abjecta -- periwinkle; Plants, Protection of -- Periodicals; Plant diseases -- Periodicals; 632
• DOI: 10.1080/03235408.2017.1336154
• Languages: English
• ISSNs: 0323-5408

Abstract

Abstract: Samples of three plant species displaying phytoplasma symptoms were collected from Kafrelsheikh and Al-Gharbia governorates during 2014. Witches' broom and virescence symptoms were observed in periwinkle ( Catharanthus roseus ). Onion ( Allium cepa ) plants showed yellowing, streaks and twisting and Opuntia abjecta with proliferation and cylindrical of cladodes. Total DNA was extracted from symptomatic and asymptomatic plants, and phytoplasma were detected in all 12 symptomatic plants collected through direct and nested PCR assays with primers P1/P7 and R16F2n/R16R2. The results of phylogenetic analysis revealed that the phytoplasma isolates belong to 16SrII group. With a nucleotide identity greater than 98.7% with three members of 16SrII group, Papaya yellow crinkle, Y10097; " Ca . P. aurantifolia", U15442; and peanut witches' broom, Al33765, the strains identified in this study are " Ca . P. aurantifolia"-related strains. Virtual RFLP analysis of the 16S rRNA gene sequences with 17 restriction enzymes confirmed that the phytoplasma isolates belong to the " Candidatus Phytoplasma australasia" 16SrII-D subgroup. To the best of our knowledge, periwinkle, onion and Opuntia abjecta are considered new hosts for 16SrII group in Egypt.