Kesan Jangkitan Virus Sauropus Yellowing (SaYV) kepada Anatomi Daun Sauropus androgynus (L.) Merr.

A comparative leaf anatomy study was performed on Sauropus androygnus leaves infected with Sauropus yellowing virus (SaYV). The objective of the study was to identify the anatomical features of leaves infected with SaYV virus and healthy leaves (control), as well as to determine the anatomical features that change with SaYV virus infection. The study involved cross-sectioning of the lamina, petiole, and leaf margin using a sliding microtome, clearing techniques for leaf venation, and epidermal peels for the adaxial and abaxial epidermis. The results of the study showed a reduction in the percentage of chlorophyll pigment on the lamina and leaf margin, vascular tissue hyperplasia on the leaf midrib and petiole, collenchyma cell hyperplasia, and an increase in the density of druses on the vascular bundles of the lamina, leaf midrib, and mesophyll tissue. There is damage to secondary and tertiary leaf veins due to virus infection. Observation results on the abaxial epidermis of infected leaves show a low stomatal density and index (SI) compared to healthy leaves. This study proves that there is a modification of the anatomical features of S. androygnus due to SaYV virus infection in response to the virus infection. The results of the study can benefit agricultural operators and can be a reference in the management of agricultural diseases, especially for disease control at the beginning of virus infection.