Abstract
Rhizobacteria exert tremendous beneficial effects on various crop plants especially the non-legumes through multidimensional approaches namely biofertilizing, bioenhancing and biocontrolling activities. They create a conducive environment in the rhizosphere, endorhizosphere, apoplastic areas of tissue in the roots as well as stem, and form new organs by producing and secreting various types of phytohormones. Among the bacteria, species of the genera Agrobacterium, Arthrobacter, Azotobacter, Azospirillum, Bacillus, Burkholderia, Herbaspirillum, Klebsiella, Pseudomonas, Rhizobium, Bradyrhizobium, Caulobacter, Chromobacterium, Erwinia, Flavobacterium, Micrococcus, Pseudomonas and Serratia are main candidates for the beneficial effects on plants. Among them Bacillus spp. are gaining prominence; application of B. sphaerichus strain UPMB10 showed beneficial effects on banana, oil palm, rice, sweet potato and other non-legumes. The bacteria are also endophytic, and found in the apoplastic area of banana roots as have been observed by transmission electron micrography (TEM). Certain rhizobacteria isolated from rice seeds have shown beneficial effects on rice under field and laboratory conditions. Proliferation of root hairs in rice due to the application of Rhizobium and Bacillus has been documented in Indica type of rice under humid tropic condition. Plant juvenile hormones like auxin and gibberellin have been isolated from Bacillus spp.-inoculated roots of rice, banana and oil palm, which triggered induction of meristem organization in pericycle in the young roots and consequently forming the lateral roots as documented by various researchers. Inoculation process by Bacillus spp. resulted in more root hairs and seedling vigor index of rice and enhanced root growth in banana tissue-cultured plantlets under hydroponic condition.
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Mia, M.A.B. (2022). Enhanced Root Morphogenesis in Non-legumes as Induced by Rhizobacteria Bacillus spp.. In: Islam, M.T., Rahman, M., Pandey, P. (eds) Bacilli in Agrobiotechnology. Bacilli in Climate Resilient Agriculture and Bioprospecting. Springer, Cham. https://doi.org/10.1007/978-3-030-85465-2_7
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