Efek inokulasi PGPR terhadap pertumbuhan tanaman padi fase vegetative di media salinitas tinggi

Abstract

Rhizobakteria merupakan kelompok bakteri yang hidup di perakaran tanaman yang bermanfaat bagi pertumbuhan tanaman melalui kemampuan menghasilkan IAA. Rhizobakteria dapat hidup di berbagai kondisi lingkungan, salah satunya di lahan salin. Tujuan penelitian ini untuk mengkaji efek Plant-Growth Promoting Rhizobacteria bagi tanaman padi pada fase vegetatif di media dengan silinitas tinggi, dan mendapatkan isolat yang paling efektif meningkatkan pertumbuhan vegetatif padi varietas Inpari Unsoed 79 Agritan. Penelitian ini dilakukan di Laboratorium Agronomi dan Hortikultura, dan Screenhouse Experimental Farm Fakultas Pertanian UNSOED pada bulan Oktober 2019-Januari 2020. Rancangan penelitian yang digunakan adalah Rancangan Acak Kelompok Lengkap dengan 6 perlakuan dan diulang 4 kali. Perlakuan pada penelitian ini antara lain kontrol, JA2, JB1, JB2, JD1, dan JE1 pada medium cair AB Mix dengan tingkat salinitas 5 dSm-1. Inokulasi PGPR meningkatkan pertumbuhan tanaman padi pada fase vegetatif. Bobot kering tanaman, panjang akar, kehijauan daun, luas daun, tinggi tanaman masing-masing meningkat sebesar 130%, 108%, 19%, 50%, 21% dengan inokulasi PGPR pada medium dengan salinitas tinggi.   Rhizobacteria are a group of bacteria that live in rhizozphere of plant which are beneficial for plant growth through the ability to produce IAA. Rhizobacteria can live in various environmental conditions, one of which is in saline fields. The research goal was to study the effect of PGPR for rice plants in the vegetative phase in high salinity media and to find the most effective isolates in increasing vegetative growth of Inpari Unsoed 79 Agritan rice. This research was conducted at the Agronomy and Horticulture Laboratory, and the screenhouse of Experimental Farm, Faculty of Agriculture, UNSOED in October 2019-January 2020. This research was arranged by using a Randomized Complete Block Design and repeated 4 times. The treatments in this study included control, JA2, JB1, JB2, JD1, and JE1 in AB Mix liquid medium with a salinity level of 5 dSm-1. The inoculation of rhizobacteria can increase the rice plant growth at vegetative phase. The plant biomass, root length, leaf greenness, leaf area, plant height increased by 130%, 108%, 19%, 50%, 21% respectively by PGPR inoculation of medium with high salinity.