Sengon is a fast growing species that is cultivated widely in Indonesia. Lately, sengon is severely attacked by fungus Uromycladium tepperianum that causing gall rust disease. It is also known to attack various types of acacia. This study aims to determine the fungal infection process U. tepperianum on sengon leaves and the possibility of infection on Acacia mangium in the laboratory trial. Leave samples and fungal pathogen teliospores obtained from Cangkringan, Sleman, Yogyakarta. Several approach procedures conducted to achieve these objectives were: (1) identification of diseased trees, (2) collecting samples of diseased leaves, branches, twigs, and stems, and (3) artificial inoculation and investigating the infection process of U. tepperianum teliospores in the laboratory. The results showed that the process of infection in sengon started by teliospores germination and germ tube formation. Successive germ tube forming penetration pegs. In the plant tissue, the penetration peg formed hypha and further developed into intracellular and intercellular hyphae. The artificial inoculation on A. mangium leaf surface showed few spores can germinate. However, none of them managed to penetrate. AbstrakSengon merupakan tanaman cepat tumbuh yang dibudidayakan di Indonesia. Namun, akhir-akhir ini banyak sengon yang menderita penyakit karat tumor sangat parah. Penyakit ini disebabkan oleh jamur Uromycladium tepperianum, juga diketahui menyerang berbagai jenis tanaman akasia. Penelitian ini bertujuan mengetahui proses infeksi jamur U. tepperianum pada daun sengon dan kemungkinan infeksinya pada Acacia mangium di laboratorium. Sampel dan teliospora jamur patogen didapatkan dari Cangkringan, Sleman, Yogyakarta. Beberapa pendekatan yang digunakan untuk mencapai tujuan tersebut adalah: (1) identifikasi pohon yang sakit, (2) pengumpulan contoh berupa daun, cabang, ranting, dan batang yang sakit, serta (3) inokulasi buatan dan proses infeksi U. tepperianum di laboratorium menggunakan teliospora U. tepperianum. Hasil penelitian menunjukkan bahwa proses infeksi pada tanaman sengon diawali dengan perkecambahan teliospora dan pembentukan buluh kecambah. Buluh kecambah selanjutnya membentuk pasak penetrasi. Di dalam jaringan tanaman, pasak penetrasi membentuk hifa dan berkembang menjadi hifa intraseluler dan interseluler. Hasil uji inokulasi buatan pada permukaan daun A. mangium menunjukkan sebagian kecil spora dapat berkecambah. Namun, tidak ada yang berhasil melakukan penetrasi.
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