Field Evidence for the Potential of Rhodobacter capsulatus as Biofertilizer for Flooded Rice

Abstract

In a previous study, we evaluated the effects of inoculating rice plants with the phototrophic purple nonsulfur bacterium Rhodobacter capsulatus (Rc) on growth and yield of rice in pots and lysimeter experiments and the results obtained have been highly encouraging. In this study, we carried out two field experiments: one in the experimental farm of the Faculty of Agriculture, Fayoum University, and the second in a farmer's field in Kafr El-sheikh, to assess the effects of Rc on growth and yield of rice in comparison and in combination with chemical nitrogen fertilizer (CNF) and farmyard manure. The results indicated that both biological and grain yields in all the Rc inoculated treatments were significantly higher than those in the uninoculated corresponding treatments in both fields. With regard to grain yield, the major factor for determining the effectiveness of any agricultural treatment, inoculation with Rc in combination with 50% of the recommended CNF rate gave a grain yield that was statistically equivalent to that obtained with 100% of the recommended CNF rate. These results provide a clear evidence for the potential of Rc as biofertilizer for flooded rice under field conditions.

Genetic diversity analysis of Bemisia tabaci populations in Pakistan using RAPD markers

“…with brown colonies (Nakayama et al 2006). These genera are typically photoheterotrophic PNSB found in paddy soil (Harada et al 2003b;Lakshmi et al 2009;Gamal-Eldin and Elbanna 2011) and they can use various fatty acids (Kim et al 2004). However, in this work we have not yet identified the isolated PNSB except for their different coloured colonies; red colonies like with rod shapped cells 75%, brown colonies with rod shapped cells 24%, and dark-brown colonies with spiral shape cells 1%.…”

“…In addition to using various organic compounds in wastewater treatment (Takeno et al 2005) they can produce H2 (Suwansaard et al 2009), indole-3-acetic acid (IAA) and 5-aminolevulinic (ALA) (Koh and Song, 2007) and many can fix N2 gas (Harada et al 2005). Therefore, PNSB have been considered to be one of 'Natures Biofertilizers' and they also have the potential to reduce CH4 emission by growing out competing methanogenic bacteria in the light (Harada et al 2003a;Gamal-Eldin and Elbanna, 2011). Recently 'organic' agriculture is becoming popular in Thailand and thereby PNSB have already been sold as commercial biofertilizers for use in paddy fields and also for shrimp cultivation although they are very expensive as there is no competition.…”

Arsenic-Redox Transformation and Plant Growth Promotion by Purple Nonsulfur Bacteria Rhodopseudomonas palustris CS2 and Rhodopseudomonas faecalis SS5

“…These properties make them ideal for wastewater bioremediation [10]. Several strains of PNSB are also known to have plant growth promoting abilities in terms of nitrogen fixation [11], phosphate solubilization, and production of phytohormones such as indole-3-acetic acid and 5-aminolevulinic (ALA) [12]. The most common genera are Rhodobacter and Rhodopseudomonas , detected in 73% and 80% of the samples, respectively [13].…”

Characteristics of purple nonsulfur bacteria grown under Stevia residue extractions

“…), a typical phytohormone regulating various developmental and physiological processes in plants (Lee et al . ; Gamal‐Eldin and Elbanna ).…”

“…Lima et al (2011) studied the heterotrophic metabolism of Rubrivivax gelatinosus in the fish industry effluent and found that the bacteria could remove organic pollutants in the wastewater. In addition, PNSB could secrete indole-3-acetic acid (IAA) in the presence of L-tryptophan (Mujahid et al 2010), a typical phytohormone regulating various developmental and physiological processes in plants (Lee et al 2008;Gamal-Eldin and Elbanna 2011).…”