This work aims to do the study of the genetic variability of the local tomato.
The results showed that genetic diversity of local tomatoes is summed up into 6 botanical forms (round Red, round Violet, flat Red, flat Violet, elongated Red, and elongated Violet) among which round Red phenotype was the most represented (56.5%).
As regards the study of in vitro pollinic fertility, the best conditions for germination and elongation of the pollinic tube are obtained at 20 g/l sucrose, 0.62 g/l of boracic. On the whole, foreign varieties (Carotina, Marmande, Makis, Opal, Roma) have a weak indicator of viability as compared to local varieties. Fertility of different flowers analyzed according to their position on the plant, is generally decreasing from bottom to top. These results could explain some cases of failure of fertilization when crossing-over different varieties of tomatoes. The results also show the importance of choice of the flower used when sampling pollen grains.
: In Kisangani, 100 taps two major networks (low and high pressure) water distribution REGIDESO were selected for bacteriological analysis.
From a quantitative point of view, the results of our study showed a high bacterial’ biodiversity in the REGIDESO distribution network: the number of bacteria varies from 6,10 to 290,10e bacteria / ml in the circulating biomass and from 4 106 to 90,106 bacteria / cm2 biomass biomass fixed generally, bacterial densities are highest in the biofiim than in the aqueous phase.
The most identified genera Escherichia, Kiebsiella, Salmonella, Citrobacter Pseudomonas, Flavobacterium, Acinetobacter, Moraxella, Micrococcus, Alcaligenes, Corynebacterium Bacillus, Enterobacter.
Maintaining the quality of drinking water should be characterized by stability of bacterial growth. The treatment plant and water distribution in the DRC must control the sources of the reduction of microbial contamination and limit microbial degradation of drinking water.
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