Competitive use of root exudates by Bacillus amyloliquefaciens with Ralstonia solanacearum decreases the pathogenic population density and effectively controls tomato bacterial wilt

Physiological response and phenolic metabolism in tomato (Solanum lycopersicum) mediated by silicon under Ralstonia solanacearum infection

“…However, in our experiment 2, citric acid or malic acid application did not increase the disease index (Fig. 2), which is inconsistent with the results of Wu et al (2015Wu et al ( , 2017. Wu et al (2017) also found that antagonistic bacteria SQYUV 162 were strongly attracted to root-secreted citric acid and malic acid, which resulted in the decrease of population density of R. solanacearum.…”

“…2), which is inconsistent with the results of Wu et al (2015Wu et al ( , 2017. Wu et al (2017) also found that antagonistic bacteria SQYUV 162 were strongly attracted to root-secreted citric acid and malic acid, which resulted in the decrease of population density of R. solanacearum. These results imply that root-secreted organic acids are treated as a carbon source by both plant-beneficial bacteria and pathogens.…”

“…Organic acids are part of root exudates, which attract and promote the colonization of plant-beneficial bacteria and may contribute to the growth of plants and enhance the resistance of plants attacked by pathogens (Yuan et al 2015;Zhang et al 2015). Wu et al (2015Wu et al ( , 2017 found that malic acid and citric acid could attract R. solanacearum under both in vitro and hydroponic conditions, which increase the incidences of R. solanacearum. However, in our experiment 2, citric acid or malic acid application did not increase the disease index (Fig.…”

Isolation and Characterization of Potential Isolates of Rhizosphere Bacteria to Contro Budok Disease in Patchouli Plant

“…Hal ini sejalan dengan pernyataan Haichar et al (2014) bahwa mikroba pada setiap rizosfir tanaman bervariasi karena komponen atau senyawa dari eksudat yang dikeluarkan oleh akar tanaman, seperti asam amino, asam organik, gula, senyawa fenol, dan metabolit sekunder lainnya juga berbeda. Wu et al (2017) melaporkan bahwa Bacillus amyloliquefaciens sebagai bakteri antagonis terhadap patogen layu bakteri pada tanaman tomat, populasinya meningkat ketika diberikan asam organik. Sementara itu, perlakuan dengan pembenah asam fenol (asam -kumarat dan asam benzoat) menurunkan populasi mikroba yang menguntungkan (mikoriza, PGPR/Plant Growth Regulator Rhizobacteria, dan antagonis) sehingga berpengaruh negatif terhadap pertumbuhan kacang tanah (Li et al 2014).…”

“…Sementara itu, perlakuan dengan pembenah asam fenol (asam -kumarat dan asam benzoat) menurunkan populasi mikroba yang menguntungkan (mikoriza, PGPR/Plant Growth Regulator Rhizobacteria, dan antagonis) sehingga berpengaruh negatif terhadap pertumbuhan kacang tanah (Li et al 2014). Adanya autotoksik pada tanaman nilam juga dilaporkan dapat menurunkan pertumbuhan tanaman nilam (Djazuli 2011;Wu et al 2017;Swamy dan Sinniah 2016). Autotoksik pada pertanaman nilam diduga menyebabkan rendahnya populasi rizobakteri dibandingkan dengan tanaman lada.…”