The most common genus in the bulk soil of Fengdan and Lan Furong was Bacillus (49.6% and 32.6%, respectively), in the

rhizosphere Microbacterium (21.1%) and Pseudomonas (42.0%), and in the rhizoplane Variovorax (53.0% and 49.1%, respectively). The results show that there are obvious differences in the bacterial communities in the three root domains of the two varieties, and the plants exerted selective pressures on their associated selleck chemicals bacterial populations. The host genotypes also influenced the distribution pattern of the bacterial community. Plant-associated bacteria (PAB) reside in the rhizosphere, phyllosphere, and tissues of healthy plants, and have diverse abilities to affect plant health, their genotypic and phenotypic characteristics, and their phylogeny (Beattie, 2006). PAB are part of the natural microbial communities of healthy plants and it is clear that many plant-associated microorganisms, even those that constitute only a small proportion of a community, can have functions that are of agricultural or environmental importance, especially as agents for stimulating plant growth and managing soil (Hallmann et al., 1997; Compant et al., 2005; Han et al., 2005), selleck compound designated as plant growth-promoting

bacteria (PGPB). Bacterial mechanisms of plant growth promotion include biological nitrogen fixation, synthesis of phytohormones, environmental stress relief, synergism with other bacteria–plant

interactions, inhibition of plant ethylene synthesis, as well as increasing availability of nutrients such as phosphorus, iron and minor elements, and growth enhancement by volatile compounds (Fuentes-Ramirez & Caballero-Mellado, 2005). Technical advances in microbial ecology and genomics have been paralleled by advances in Epothilone B (EPO906, Patupilone) our understanding of the structure and dynamics of these plant-associated microbial communities and the molecular basis of plant–microorganism and microorganism–microorganism interactions. A large body of literature has described the crop plant-associated bacterial community and its applications in agriculture, and some strains have been developed as biofertilizers (Podile & Kishore, 2006). However, little research has focused on the ornamental plant-associated bacterial community and its applications. PAB have been isolated from many crop plant species (Rosenblueth & Martinez-Romero, 2006), including rice (Engelhard et al., 2000), soybean (Kuklinsky-Sobral et al., 2004), potato (Asis & Adachi, 2004), wheat (Coombs & Franco, 2003) and maize (Zinniel et al., 2002), as well as ornamental plants, such as tulsi (Tiwari et al., 2010), avocado (Cazorla et al., 2007), and palm (Rivas et al., 2007). There is a great opportunity to find new and interesting plant-associated microorganisms among the myriads of plants in different settings and ecosystems.