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First molecular evidence of Citrus yellow vein clearing virus from citrus in Punjab, Pakistan.

Cao, M. J. ; Wu, Q. ; Atta, S. ; Su, H. N. ; Yu, Y. Q. ; Chen, H. M. ; Zhou, C. Y.

Plant Disease 2016 Vol 100 No. 2 pp. 540;

Abstract

In 2009, a survey was performed to evaluate the occurrence and distribution of citrus viruses and virus-like diseases in Pakistan Punjab, Pakistan. Field symptoms of distinct yellow vein clearing and leaf distortion were observed on 2 lemon trees in Faisalabad District. Infected budwood from one symptomatic Eureka lemon (Citrus limon) tree was grafted onto lemons budded on rough lemon rootstock as indicator plants. Six months later, typical yellow vein clearing disease symptoms were visible on lemon seedlings. The causal pathogen was identified as Citrus yellow vein clearing virus (CYVCV) based on various molecular analyses (RACE and RT-PCR). This is thought to be the first molecular evidence of CYVCV occurrence in Pakistan.