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University of Agricultural Sciences, Dharwad

The University of Agricultural Sciences, Dharwad was established on October 1, 1986. The University has 5 Colleges, 27 Research Stations, 6 Agriculture Extension Education Centers, 6 Krishi Vigyan Kendras and ATIC. The University has its jurisdiction over 7 districts namely Bagalkot, Belgaum, Bijapur, Dharwad, Gadag, Haveri, and Uttar Kannada in northern Karnataka. Greater diversity exists in soil types, climate, topography cropping and farming situations. The jurisdiction includes dry-farming to heavy rainfall and irrigated area. Important crops of the region include sorghum, cotton, rice, pulses, chilli, sugarcane, groundnut, sunflower, wheat, safflower etc. The region is also known for many horticultural crops. Considerable progress has been registered in the field of education, research and extension from this University.

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Subject: Agricultural Microbiology × Type: Thesis × Start date: 2010 × End date: 2016 × Author: D.V.Indi ×
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    ThesisItemOpen Access
    Studies on plant growth promoting fluorescent pseudomonads of Uttara Kannada District of Karnataka State
    (UAS Dharwad, 2010) D.V.Indi; A.R.Alagwadi
    Of the 133 fluorescent pseudomonads from Uttara Kannada district, 86 were identified as Pseudomonas fluorescens, 45 as P. aeruginosa and two as P. aureofaciens. Seventy isolates released 11.85 to 60.60 % Pi at 14 days. The IAA and GA production ranged from 30-984 μg/l and 55-342 μg/l of broth respectively and 22 isolates produced cytokinins (4.07-58.44 μg/l). While 67 produced alkaline protease, 28 had high chitinolytic activity. Sixty-seven isolates antagonized one or other plant pathogens; 49 were inhibitory to A. carthami, 39 to F. oxysporum f. sp. carthami (Foc), 32 to S. rolfsii, 23 to R. bataticola, 42 to X. axonopodis pv. punicae (Xap), 59 to X. axonopodis pv. malvacearum, 42 to R. solanacearum and 41 to X. axonopodis pv. citri. Of these, 41 produced HCN and all of them produced siderophores. Out of 28 potential antagonists, 26 produced antimicrobials. Five antagonists against each of the 4 fungal pathogens produced volatile metabolites which inhibited S. rolfsii, A. carthami and Foc. Fifteen isolates with multifunctional properties were evaluated in pot cultures. In safflower, DF 75 was the best for growth promotion. When safflower was challenged with Foc, MDF 449(1) recorded best growth promotion coupled with the least wilt incidence and highest ISR activity. In pomegranate, MDF 449(1) was best for growth promotion. When pomegranate was challenge inoculated with Xap, DDF 347(1) showed maximum growth promotion coupled with the least bacterial blight intensity and highest ISR activity in leaves. The RAPD analysis of 25 isolates indicated tremendous diversity. The dendrogram for pooled data showed nine clusters. The Shannon’s index of pooled data was 0.71 indicating high diversity the maximum being in dry deciduous forest (0.79). The richness index was 0.65 indicating that fluorescent pseudomonads are not distributed equally. Low evenness index of 0.26 indicated dominance of P. fluorescens over the others.