Plant growth promoting bacteria enhance water stress resistance in green gram plants

Abstract

Plant growth promoting bacterial (PGPB) strains Pseudomonas fluorescens Pf1 and endophytic Bacillus subtilis EPB5, EPB22, EPB 31 were tested for their capacity to induce water stress related proteins and enzymes in green gram (Vigna radiata) plants. Among the different bacteria used, P. fluorescens Pf1 increased the vigour index, fresh weight and dry weight of green gram seedlings in vitro. Quantitative and qualitative analyses of stress-related enzymes indicated the greater activity of catalase and peroxidase in green gram plants bacterized with P. fluorescens Pf1 against water stress when compared to untreated plants. The greater accumulation of proline was recorded in Pf1 treated plants compared to untreated plants. The pot culture study revealed the greater resistance to water stress by green gram plants treated with P. fluorescens Pf1 compared to untreated plants. The greater activity of stress-related enzymes in green gram plants mediated by PGPB could pave the way for developing drought management strategies.

Amelioration of Drought Stress Adverse Effect and Mediating Biochemical Content of Cabbage Seedlings by Plant Growth Promoting Rhizobacteria

“…The positive role of PGPR plant growth under drought stress can be caused by nutritional, physiological, and cellular effects (Saravanakumar et al, 2011). In the present research the improved seedling growth parameters in response to inoculanted TV-6D compared with the control indicates the beneficial role of these rhizobacteria.…”

“…Drought-stressed plants accumulate various molecules such as proline thereby protecting enzyme activity (Saravanakumar et al, 2011). Proline as stress responsive molecule is often synthesized by plants in response to various abiotic stress conditions (Naveed et al 2014).…”

Impact of arbuscular mycorrhizal fungus, Glomus intraradices, Streptomyces and Pseudomonas spp. strain on finger millet (Eleusine coracana L.) cv Korchara under water deficit condition

“…Kohler et al (2009) demonstrated the greater activity of antioxidants in lettuce plants under drought conditions when inoculated with Pseudomonas mendocina and AMF (G. intraradices or G. mosseae) and suggested that the use of inoculants to alleviate the oxidative damage elicited by drought. Saravanakumar et al (2011) reported Pseudomonas strains when inoculated to green gram and observed a significant increase in antioxidant enzymes when plants were exposed to water stress condition.…”

Bacterias endófitas de la raíz en líneas de maíces tolerantes y susceptibles a sequía

“…En otros cultivos se han señalado como inductores de tolerancia en trigo (Triticum sativum) y leguminosas (Vigna radiata) al ser inoculados en semilla y promoviendo el incremento en los niveles de regulación de genes relacionados con la tolerancia a sequía y la actividad de diversas enzimas (Kasim et al, 2013;Saravanakumar et al, 2011).…”

“…Por la frecuencia de los aislamientos, en el presente estudio se destacan tres grupos de bacterias endófitas en la raíz de maíces tolerantes y susceptibles a sequía: 1) altamente frecuentes (Bacillus subtilis, Bacillus megaterium y Pseudomonas geniculata), aislados durante los tres ciclos de cultivo in seed, for they promoted an increase in the levels of regulation of genes related to drought tolerance and the activity of diverse enzymes (Kasim et al, 2013;Saravanakumar et al, 2011).…”