Short Communication: Development of selected PGPR consortium to control Ralstonia syzygii subsp. indonesiensis and promote the growth of tomatoYanti Y, Warnita, Reflin. 2018. Short Communication: Development of selected PGPR consortium to control Ralstoni

Abstract

Yanti Y, Warnita, Reflin. 2018. Short Communication: Development of selected PGPR consortium to control Ralstonia syzygii subsp. indonesiensis and promote the growth of tomato. Biodiversitas 19: xxxx. A microbial consortium is a group of different species of microorganisms and acts as a community. Combinations of biocontrol strains are expected to have a better result to suppress multiple plant diseases. Our previous research had selected four plant growth promoting rhizobacteria (PGPR) strains from chili (B. pseudomycoides strain NBRC 101232, B. cereus strain CCM 2010, Bacillus toyonensis strain BCT-7112, Serratia nematodiphila strain DZ0503SBS1) and three strains from tomato (Bacillus pseudomycoides strain NBRC 101232, Bacillus toyonensis strain BCT-7112, Bacillus thuringiensis strain ATCC 10792 ) which had ability to promote growth and control Ralstonia syzygii subsp. indonesiensis indigenously. The strains were used in the development of PGPR consortiums to increase their ability for biocontrol agent of Ralstonia syzigii subsp. indonesiensis and promoting the growth of tomato. Results showed that not all strains had good compatibility to grow together. Ten consortiums were developed based on their compatibilities. All consortiums exhibited the capability to reduce bacterial wilt disease development and also promote the growth of tomato. The consortium consisted of Serratia nematodiphila strain DZ0503SBS1, B. cereus strain CCM 2010, Bacillus aryabhattai strain B8W22 and Bacillus cereus strain IAM 12605 resulted in the best ability to reduce disease development and promote growth and yield of tomato.

Effectiveness of a single and a mixture treatments of rhizobacteria in increasing the growth and yield of hot pepper (Capsicum annuum L.)

“…SWRIIA02 in seeds gave the best results on chili growth and yield, so it can be stated that the two types of rhizobacteria are mutually compatible. In line with the results of this study, it was reported that the use of a mixture of two or more types of rhizobacteria significantly increased the yield of maize [37] dan tomato [38].…”

Consortium solid formula of bacillus spp. to control bacterial wilt on chili plants

“…Furthermore, 20 ml of of R. syzygii subsp. Indonesiensis suspension with a density of 107 cells/ml was sprinkled on the roots of the chili plants that had been injured [10].…”

“…The planting medium used was a mixture of soil and manure (2:1 v/v). The planting medium is put in a plastic bag and then sterilized in a boiler for 1 hour at 100 0 C. The planting medium was put 5 g into a pottray for seeding and 10 kg into a polybag for planting [10].…”

“…The Bacillus spp group. which have been extensively studied as biological agents, namely B. thuringiensis, B. cereus, and B. toyonensis [10]. The use of Bacillus sp.…”

Effect of Plant Growth Promoting Rhizobacteria (PGPR) on Increasing the Activity of Defense Enzymes in Tomato Plants

“…Several studies have shown the ability of PGPR to increase the activity of defense enzymes in plants, including cucumber roots treated with Pseudomonas corrugata 13 or Pseudomonas aureofaciens 63-28 can increase phenylalanine ammonia-lyase (PAL) activities, peroxidase (PPO) and polyphenol oxidase (PO) activity (Chen et al 2000). Turmeric plants introduced with Bacillus amyloliquefaciens BaTNAU5 and Pseudomonas fluorescens strain Pf3TNAU triggered an increase defense enzymes peroxidase (PO), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL), β- were 3 root bacteria and 4 endophytic bacteria which were able to suppress whitefly populations and tomato wilt disease (Yanti 2018 andHamid 2020). This study aims to determine the activity of the PPO, PO and PAL defense enzymes with selected PGPR isolates.…”