Microbial communities of continuously cropped, irrigated rice fields

Article Abstract:

The microbial populations, especially those of sporeforming and denitrifying bacteria, decrease with the initiation of the reproductive phase in continuously cropped and irrigated rice fields. Populations of methanogens, group II methanotrophic bacteria and fermentative anaerobes increase, while that of sulfate-reducing bacteria are unaffected during the second part of the crop cycle. The decrease in productivity of the fields is due to the decrease in microorganisms that provide nutrients to the rice plants.

Rice, Irrigation farming

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Comparison of bacterial community structures in the rhizoplane of tomato plants grown in soils suppressive and conducive towards bacterial wilt

Article Abstract:

Research was conducted to examine the biological factors that contribute to the suppressiveness of the soil in three treated Mutsumi soils infested with Ralstonia solanacearum. Soil samples for tomato bacterial wilt were bioassayed, followed by the characterization of the types of rhizoplane bacteria by 16S ribosomal DA-restriction fragment length polymorphism analysis. Results indicate the difficulty for the pathogen to become dominant in a diversified rhizobacterial community thriving on pectin.

Pectin, Recombinant DNA, Tomatoes

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Spatial patterns of rhizoplane populations of Pseudomonas fluorescens

Article Abstract:

A study of the spatial pattern differences between Pseudomonas fluorescens strains 2-79RN(sub 10) and 2-79-B46 on the rhizoplane of pea seedlings is given. Strain 2-79RN(sub 10) is a biological control agent while 2-79-B46 is phenazine-deficient Tn5 mutant. The study was undertaken to find out if changes in spatial patterns of colonization leads to a loss of phenazine production by mutation. The study employed geostatistical analysis in quantifying the spatial patterns.

Pea, Measurement, Pseudomonas fluorescens, Diseases and pests, Peas

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