Abstract
During a survey performed in sapota orchards of India, from 2015 to 2018, symptoms of phyllody, little leaf, flat stem and witches' broom were observed in three states: Karnataka, Kerala and Tripura. The association of phytoplasmas was confirmed in all the symptomatic sapota samples by using nested PCR specific primers (P1/P7, R16F2n/R16R2 and 3Far/3Rev) with amplification of fragments of ~ 1.25kb and ~ 1.3kb. Association of three phytoplasma groups, aster yellows with flat stem from Tripura (Lembucherra), clover proliferation with phyllody symptoms at Karnataka (Bengaluru) and bermuda grass white leaf with flat stem and little leaf from Kerala (Thiruvananthapuram) and Tripura (Cocotilla) were confirmed by 16S rRNA gene sequence comparison analysis. Virtual RFLP analysis of 16S rRNA gene sequences using pDRAW32 further classified the sapota phytoplasma isolates into 16SrI-B, 16SrVI-D and 16SrXIV-A subgroups. This is the first report on identification of three phytoplasma groups in sapota in world.
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