EFEKTIVITAS NANOKITOSAN DALAM MENGINDUKSI LIGNIFIKASI DAUN DAN MENEKAN PENYAKIT BUSUK PELEPAH PADA PADI YANG DISEBABKAN OLEH Sarocladium oryzae
NUR LAILIN NAFIAH, Prof. | Ir. Achmadi Priyatmojo, M.Sc., Ph.D., IPU.; Prof. Ani Widiastuti, S.P., M.P., Ph.D
2026 | Tesis | S2 Fitopatologi
The application of nanochitosan through immersion and spraying techniques is known to trigger plant defense responses, providing opportunities to suppress disease development. This study aims to evaluate the effectiveness of nanochitosan in suppressing sheath rot disease caused by Sarocladium oryzae in rice plants by inducing leaf lignification. The research was conducted using immersion and spraying treatments of nanochitosan at concentrations of 200, 400, and 600 ppm, as well as control treatments with saccharin and control inoculated with the S. oryzae pathogen. The results showed that the application of nanochitosan at a concentration of 400 ppm could inhibit the growth of S. oryzae by 30.9% in vitro, reduce the incidence and intensity of sheath rot disease by 78% and 82.2% compared to the inoculated control, and the nanochitosan treatment could increase seed germination and plant height by 100% and 71.3 cm compared to the inoculated control with 60% and 46 cm. Lignification analysis conducted on leaf tissues using phloroglucinol-HCL staining was able to 1.02 um, increase the intensity of the red color in plants treated with 400 ppm nanochitosan with inoculation by 190.1 bit/pixel and reduce the stomatal opening width by in thickness of line the with the thickening of the leaf tissue structure, including the sclerenchyma, mesophyll, and parenchyma. The increased lignification accompanied by the thickening of the leaf tissue can inhibit pathogen infection into the rice plant tissues and stimulate a decrease in the incidence and intensity of the sheath rot disease.
Keywords: Leaf histology, induced resistance, lignification, nanochitosan, rice
Kata Kunci : Leaf histology, induced resistance, lignification, nanochitosan, rice