Paclobutrazol Improves The Agronomic Performance and Micromorphological Profile of Five Local Black Rice ( Oryza sativa L.) Varieties in Central Java Indonesia

Local black rice (Oryza sativa L.) is one of the biodiversity in Indonesia, which has tall stature and long cultivation period, easy to lodge, requires more intensive care. Paclobutrazol (PBZ) a plant growth inhibitor compound that could reduce height accelerate plants entering generative phase. This study aimed determine effects PBZ concentration on agronomic character micromorphological profile five local varieties. research was conducted experimentally using completely randomized factorial design. The first factor variety (Brebes, Klaten, Magelang, Pati, Pekalongan ), while second (0, 100, 200, 300 ppm) with three replications. spraying fourth week after planting. data obtained were analyzed ANOVA HSD test (α=5%). results showed concentrations ppm produced heaviest 100 grains. Klaten had wide abaxial stomata, Magelang high stomata density, Pati interaction between Brebes 0 adaxial stomatal variety, have vast trichome density. most tillers, grains per panicle. study's critical findings are gives different micromorphology improvements increases performance rice.