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- W107551266 abstract "The problem in sweetpotato cultivation is yield reduction with continuousplanting, which can be attributed to several factors such as soil degradation,pathogenic effects, and allelopathic effects. One of the approaches toalleviate this problem is by inoculating plants with indole-3-acetic acid (IAA)producing rhizobacteria to enhance growth of sweetpotato.The study consisted of four experiments. Experiment I was the isolation ofrhizobacterial strains from sweet potato rhizosphere and their performance insweetpotato root exudate culture. Experiment II was the selection of IAAproducing rhizobacteria and their effects on sweet potato growth. ExperimentIII was the determination of the effect of pH and carbon sources on growth ofrhizobacteria isolated from sweetpotato rhizosphere. Experiment IV was thedetermination of the effects of L-tryptophan (T RP) on performance of IAAproducing rhizobacteria on growth of sweetpotato. From the isolation procedures, 115 rhizobacterial isolates were collectedfrom different varieties of sweetpotato grown on different soils. They weregrouped into 6 types according to colour of the colonies which consist ofpurple, milky white, translucent, orange, yellow and brown. The studyshowed that 48 isolates (41.74 %) were able to grow on medium containingsweetpotato root exudate of which, 18 isolates (37.5%) were able to produceIAA in culture medium which ranged between 4 to 8 ug/m L.The first pot experiment showed that 6 isolates ( SP R 66, SP R 83, SP R 85,SP R 88, SP R 100 and 90-166) were able to stimulate the initial growth ofsweetpotato vines. Three of the isolates namely SP R 66, SP R 83 and SP R100 showed positive responses on media with wide range of pH and differentcarbon sources. The optimum pH of medium for rhizobacterial growth was6.75, and the most favourable carbon source was malic acid.The second pot experiment showed that isolate SP R 66 increased the shootdry weight, chlorophyll content and total leaf area of shoots, while isolateSP R 100 increased the dry weight and volume of roots, the storage rootformation, nutrient concentration in shoots and soil nutrient contents. Theaddition of L-T RP to all selected rhizobacterial isolates enhanced growth andyield of sweetpotato. It related to the improved of soil chemical propertiesand microbial activity." @default.
- W107551266 created "2016-06-24" @default.
- W107551266 creator A5076381862 @default.
- W107551266 date "2000-12-01" @default.
- W107551266 modified "2023-09-26" @default.
- W107551266 title "Indole-3 Acetic Acid Producing Rhizobacteria and its Potential to Enhance Growth of Sweetpotato (Ipomoea Batatas L.)" @default.
- W107551266 hasPublicationYear "2000" @default.
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