Abstract
Fluorescent Pseudomonas spp. comprise an important group of rhizosphere bacterial community affecting plant growth. Sorghum is an important fifth largest cereal crop in world. 75 fluorescent Pseudomonas spp. were isolated from diverse agro-ecosystems of India and evaluated for their plant growth promoting ability initially by paper cup method. Fourteen selected isolates were further evaluated under glass house conditions. Plants inoculated with bacteria showed higher growth and nutrient uptake than controls. Seedlings treated with selected isolate P17 showed highest root volume (0.3 cm3 ), shoot length (36.2 cm), dry mass (152 mg), leaf area (31 cm2 ), chlorophyll (23 spad units), carbohydrates (30%), phosphorus (1.3%), nitrogen (2.2%) and other nutrients. Among the evaluated isolates Pseudomonas sp. P17 strain was identified as a potential PGPR for nutrient uptake and plant growth in sorghum. This finding has potential for integrated plant nutrient management in rainfed agroecosystems where farmers tend to rely on cost effective technologies for enhanced profitability
Highlights
Sorghum (Sorghum bicolor L.), is an important rainfed crop grown world over on 42 million ha in 98 countries and Nigeria, India, USA, Mexico, Sudan, China and Argentina are the major producers [1]
We report isolation and variations among 75 isolates of Pseudomonas spp. from 23 different agroecological regions of India with respect to their ability to promote nutrient uptake and growth in sorghum
Pseudomonas spp. isolated from different soil samples showing fluorescein production on King’s B medium were selected and purified. 75 fluorescent Pseudomonas spp. were isolated from soil samples obtained from 31 different locations representing 13 states of India (Figure 1)
Summary
Sorghum (Sorghum bicolor L.), is an important rainfed crop grown world over on 42 million ha in 98 countries and Nigeria, India, USA, Mexico, Sudan, China and Argentina are the major producers [1]. In India, sorghum was planted in 7.7 million ha with production of 7.24 million tonnes and productivity of 940 kg. Soil microorganisms play important role in determining plant productivity. Soil microorganisms are directly responsible for recycling of nutrients [4]. Considering the ill-effects of inorganic fertilizers on soil health, adoption of integrated nutrient management (INM) has been advocated for sustainable agriculture. Efforts to supplement nutrients through biofertilizers as part of INM helped the rainfed farmers significantly [5]. Microorganisms that facilitate nutrients availability and use could form sustainable solutions for present and future agricultural practices [6]. Due to the ubiquity and versatility of pseudomonads, there is a considerable interest in exploiting these bacteria for diverse agricultural applications such as plant growth promotion and pest management etc., [8]
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