KARAKTER AGRONOMI DAN FISIOLOGI TANAMAN PADI (Oryza sativa L. cv Inpari Unsoed 79 Agritan) YANG TERINFEKSI Xanthomonas oryzae pv. oryzae DAN DIINOKULASI RHIZOBACTERIA INDIGENOUS LAHAN SALIN

Abstract

Rhizobacteria are a group of rhizosphere bacteria that lives in the soil around plant roots. The halotolerant Rhizobacteria that live in saline soil can colonize the plant's rhizosphere in the presence of root exudates. The association of rhizobacteria and plant roots can promote plant growth and resistance to leaf blight disease  attacks in rice through the production of IAA phytohormones at the root and stimulate the induction systemic resistance  of the plant. This research aims to examine the effect of Rhizobacteria indigenous saline inoculation on paddy growth and yield and obtain Rhizobacteria isolates that effectively increase paddy growth and yield and reduce the development of rice leaf blight disease in high salinity conditions. The research was conducted at the Agronomy and Horticulture Laboratory, Bacteriology Laboratory, and Screen House Experimental Farm, Faculty of Agriculture UNSOED in March – June 2021. The study was applied a single-factor Randomized Block Design (RAK) with 9 treatment levels and repeated 3 times. The treatments that were tested in this study included control, control of Xoo infection, and inoculation of isolates JA1, JB1, JB2, JD1, JE1, R08, R011 infected with Xoo bacteria on AB Mix liquid medium with salinity content (EC) of 5.5 dS.m-1. Inoculation of Rhizobacteria isolates was able to increase paddy (Inpari Unsoed 79 Agritan) growth in plant biomass, total root length, leaf area, leaf chlorophyll content, net assimilation rate (NAR), number of tillers, and plant height of rice respectively by 142.5%, 106.9%, 68.2%, 34.3%, 64.7%, 61.7%, and 23.7%. Inoculation of Rhizobacteria isolates was able to increase rice yields in grain weight per clump, the weight of 1000 seeds, and harvest index by 47.5%, 10%, and 18,5%. In addition, inoculation of Rhizobacteria isolates was able to reduce grain voidness by 15% and suppress the intensity of leaf blight disease  by 12.4%.