Differentiation and Classification of Phytoplasmas Associated with Almond and GF‐677 Witches'‐Broom Diseases using rRNA and rp Genes |
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| Authors: | Ehsan Motamedi Mohammad Salehi Seyed Kazem Sabbagh Mohammad Salari |
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| Institution: | 1. Faculty of Agriculture, Department of Plant Protection, Institute of Plant Biotechnology, University of Zabol, Zabol, Iran;2. Plant Protection Research Department, Fars Agricultural and Natural Resources Research and Education Centre, AREEO, Zarghan, Iran |
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| Abstract: | Stone fruits are affected by several diseases associated with plant pathogenic phytoplasmas. Previous studies have been shown that phytoplasma agents of almond and GF‐677 witches'‐broom (AlmWB and GWB, respectively) diseases belong to pigeon pea witches'‐broom (16SrIX) phytoplasma group. In this study, partial biological and molecular characterization was used to compare and classify phytoplasma agents of Khafr AlmWB (KAlmWB) and Estahban GWB (EGWB) diseases. Production of different symptoms in periwinkle indicated that agents of KAlmWB and EGWB are differentiable. Expected fragments were amplified from diseased almond and GF‐677 trees in direct PCR using phytoplasma universal primer pairs P1/P7 and rpF1/rpR1 and nested PCR using P1/P7 followed by R16F2n/ R16R2 primer pair. 16S‐rDNA Restriction fragment length polymorphism (RFLP) as well as phylogenetic analysis of rplV‐rpsC and 16S–23S rRNA spacer region sequences classified KAlmWB and EGWB phytoplasmas within 16SrIX‐C (rpIX‐C) and 16SrIX‐B (rpIX‐B) subgroups, respectively. |
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| Keywords: | almond Candidatus Phytoplasma phoenicium GF‐677 phytoplasma |
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