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Authors Ayvacı

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Ayvacı, Hümeyra


Publications
4

CitationNamesAbstract
First Detection of ‘Candidatus Phytoplasma australasia’ in Robinia pseudoacacia: Molecular Characterization and Tissue-Specific Distribution Ayvacı et al. (2025). Black Sea Journal of Agriculture 8 (4) Ca. Phytoplasma australasia
First report of ‘Candidatus Phytoplasma australasia’-related strain’ (16SrII-D) in Pyracantha angustifolia (narrowleaf firethorn) KILIC et al. (2022). Australasian Plant Disease Notes 18 (1) Ca. Phytoplasma australasia
Physiological and Biochemical Changes in Lucerne (Medicago sativa) Plants Infected with ‘Candidatus Phytoplasma australasia’-Related Strain (16SrII-D Subgroup) Ayvacı et al. (2022). The Plant Pathology Journal 38 (2) Ca. Phytoplasma australasia
First report of a 'Candidatus Phytoplasma trifolii'-related strain (16SrVI-A) associated with white leaf disease in Spirea japonica Şimşek et al. (2021). Australasian Plant Disease Notes 16 (1) Ca. Phytoplasma trifolii

First Detection of ‘Candidatus Phytoplasma australasia’ in Robinia pseudoacacia: Molecular Characterization and Tissue-Specific Distribution
Candidatus phytoplasma affects a wide range of host plants. In recent years, the severity and distribution of the disease have increase many fold. The present study isolated the pathogen from leaves (chlorosis), dried branches, and the other tissues of the infected tree. Acacia trees (n=15) showing severe yellowing and desiccation in the landscape areas of Şanlıurfa province were sampled from the buds (V-shaped) in three different parts of the branches, backward from the top of the branches during the flowering period, and from the middle veins of the leaves on the same branch during the leafing period. Samples were initially amplified using the universal primer pair R16F1/R16R0 and subsequently subjected to nested PCR with the primer pair R16F2n/R2. The results indicated that, on average, 2 out of 15 buds collected from the apical parts of the branches, 11 out of 15 from the middle, and 6 out of 15 from the basal parts were infected with ‘Candidatus Phytoplasma australasia’. Moreover, all samples collected from the midribs of these 15 trees were found to be infected with Ca. P. australasia.
Physiological and Biochemical Changes in Lucerne (Medicago sativa) Plants Infected with ‘Candidatus Phytoplasma australasia’-Related Strain (16SrII-D Subgroup)
Changes in physiological and biochemical patterns in lucerne plants caused by the presence of ‘Candidatus Phytoplasma australasia’, which is one of the significant pathogens causing yield losses in lucerne plants, were investigated. Significant differences were evident in total chlorophyll, chlorophyll a, chlorophyll b, and protein amounts between ‘Ca. Phytoplasma australasia’-positive and negative lucerne plants. Stress-related metabolites such as phenol, malondialdehyde, and proline accumulations in ‘Ca. Phytoplasma australasia’-positive plants were remarkably higher than those of phytoplasma-negative plants. As a response to disease attack, phytoplasma-positive plants exhibited higher antioxidant enzymes (peroxidase and catalase) and non-enzymatic metabolite responses such as jasmonic and salicylic acids. We state that partial disease responses were revealed for the first time to breed resistant lucerne lines infected by ‘Ca. Phytoplasma australasia’.
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