TY - JOUR AU - Oktriawan, Tendy AU - Ariefta, Nanang AU - Raharjo, Tri Joko AU - Astuti, Endang AU - Koseki, Takuya AU - Shiono, Yoshihito PY - 2023/01/27 Y2 - 2024/03/29 TI - Phytotoxic and Cytotoxic Polyketides Produced by Fungal Endophytes Isolated from Psidium guajava JF - HAYATI Journal of Biosciences JA - HAYATI J Biosci VL - 30 IS - 3 SE - Articles DO - 10.4308/hjb.30.3.473-479 UR - https://journal.ipb.ac.id/index.php/hayati/article/view/39161 SP - 473-479 AB - Endophytic fungi reside within their host plants with no obvious symptoms. They have been proven as abundant sources of new bioactive compounds with diverse structures. In our continuous search of the new compound from endophytic fungi, a new compound, 5,7-dihydroxy-3(R)-methylphthalide (1), was isolated from Xylaria brevipes PGR1, and three known compounds, (–)-altenuene (2), alternariol (3), and altertoxin I (4), were isolated from Alternaria alternata D-8. Both endophytic fungi were isolated from the branch of an Indonesian medicinal plant, Psidium guajava. Their structures were elucidated using extensive spectroscopy analyses, including 1D/2D NMR, HRESITOFMS, and data comparisons with the literature. Compounds 1–3 exhibited phytotoxicity at IC50 (µg/ml) values of 4.6, 23.07, and 77.28, respectively. Additionally, 1–4 showed significant cytotoxicity in the brine shrimp lethality test (BSLT), with mortality rates at 75%, 50%, 90%, and 80% at the concentration of 0.19 μg/ml, respectively. ER -