Piper yellow mottle virus (PYMoV) is the most frequently occurring virus causing mottle disease in black pepper plants in Sukabumi, West Java. As a pararetrovirus, PYMoV occurs in the plant as endogenous (inactive) and episomal (active, infectious) forms. Research was carried out to detect and identify PYMoV from leaf and berry samples by polymerase chain reaction (PCR) and reverse transcription-PCR (RT-PCR) followed by sequencing and nucleotide sequence analysis. Both endogenous and episomal forms of PYMoV were successfully detected from leaf and berry samples, although the endogenous form was more numerous than the episomal form. Results from black pepper berries proved the existence of both forms within single plants. It was further confirmed that endogenous and episomal PYMoV from the leaves and berries of the same plant had identical sequences, indicating the same isolates. This study is the first report of an endogenous and episomal form of PYMoV in a single plant.

派珀黄斑驳病毒（PYMoV）是西爪哇省Sukabumi地区黑胡椒植物中最常见的引起斑驳病的病毒。作为副逆转录病毒，PYMoV以内源性（无活性）和游离型（有活性，传染性）形式存在于植物中。进行了研究，以通过聚合酶链反应（PCR）和逆转录PCR（RT-PCR）从叶和浆果样品中检测和鉴定PYMoV，然后进行测序和核苷酸序列分析。从叶片和浆果样品中成功检测出内源和游离形式的PYMoV，尽管内源形式比游离形式更多。黑胡椒浆果的结果证明了单一植物中两种形式的存在。进一步证实，来自同一植物的叶子和浆果的内源性和游离型PYMoV具有相同的序列，表示相同的分离物。这项研究是单一植物中内源性和游离型PYMoV的首次报道。