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Abidjan, Ivory Coast

Koutoua A.,University Abobo Adjame | Hmouni D.,Universite Ibn Tofail | Elyacoubi H.,Universite Ibn Tofail | Moutiq R.,National Institute of Agronomical Research | And 2 more authors.
Journal of Materials and Environmental Science | Year: 2015

Mature embryos were used to establish callus cultures in MS modified medium. Cell lines calli were then submitted to increasing concentrations [0, 4, 8, 12, 16 g.L-1] of NaCl. Therefore growth, water and ions contents (K+, Na+ and Cl-) were determined in both the control (unselected wild-type calli maintained in salt-free medium) and selected (tolerant and sensitive genotypes) calli. Selected salt-tolerant calli showed no growth reduction in comparison with the control when treated with 16 g.L-1 NaCl while a significant growth decrease was noted in salt-sensitive ones. Water content was significantly higher in salttolerant calli than in salt-sensitive ones. Both tolerant and sensitive calli accumulated less K+ than the control but K+ content of salt-tolerant calli remained higher than that of salt-sensitive ones. Accumulation of Na+ and Cl- was higher in salt-sensitive calli than in salt-tolerant ones with Na+ increase being the highest. The results indicated that Na+ especially but also Clexclusion play a key role in salt-tolerance in wheat calli lines. The comparison of K+/Na+ ratio allowed to classify wheat varieties Sebou, Anouar and Tarek as salt-tolerant and Marzak, Ourgh, Massa, Tomouh and Amjad as salt-sensitive ones. Source

Ehouman N.M.,University Abobo Adjame | Tiho S.,University Abobo Adjame | Dagnogo M.,University dAbobo Adjame
European Journal of Soil Biology | Year: 2012

Diamonds assembly rules predict that competitive interaction leads to a non-random cooccurrence of patterns. Earthworms were sampled in three sites of vegetation of Lamto savanna to test the reducing level of co-occurrence of species among earthworm communities. Null model and spatial method were used as cokriging to generate patterns expected in the absence of species interactions. Three indices of null model showed that species co-occurrence in the three sites was less than expected by chance. Furthermore the cokriging revealed positive association between Stuhlmannia porifera and Chuniodrilus zielae and negative association between Millsonia omodeoi and the two other species. This study indicates that the non-random selection observed in the three sites of vegetation is due to an interaction between species close to the same ecological category. © 2012. Source

Moussa K.,UMR1289 Tissus Animaux Nutrition Digestion Ecosysteme et Metabolisme | Moussa K.,University Abobo Adjame | Combes S.,UMR1289 Tissus Animaux Nutrition Digestion Ecosysteme et Metabolisme | Dofara S.,University Abobo Adjame | And 3 more authors.
European Journal of Scientific Research | Year: 2012

Stability is the first criterion of probiotic after its scientific identification. For rabbit, probiotic must resist for the enzyme of digestive tract and the high temperature during diet pelleting. The aim of this study is to evaluate yeast S. cerevisiae SC 47 stability in rabbit diet. Three diets were formulated. Diets DF deficiency fibres group (21%NDF) is constituted by diet DF0, DF1 and DF5. Zero, 1 and 5 g of yeast S. cerevisiae SC 47 per kg were used respectively in diet DF0, DF1 and DF5. Diet C (37%NDF), 0, 1 and 5 g of yeast S. cerevisiae SC 47 per kg were used respectively in diet C0, C1 and C5. Diets group T (39%NDF), 0, 1 and 5 g of yeast S. cerevisiae SC 47 per kg were used respectively in diet T0, T1 and T5 formulation. One gram of yeast S. cerevisiae SC 47 in diet is equal to 10 10CFU. Results show that pelleting temperature was increased linearly with fibres concentration in diet Θf(°C) = 7.3 (±5.2)+0.8(±0.2)×NDF(%), P<0.1, R 2=51%). When pelleting temperature increases, 1 log (CFU/g) of yeast S. cerevisiae SC 47 in diets is destroyed from 21%NDF to 37%NDF. However, with 39%NDF in diet, 3 and 2 log (CFU/g) of yeast S. cerevisiae SC 47 were lost. Yeast S. cerevisiae SC 47 can be considered to be stable to pressure and temperature variation during the pelleting. © EuroJournals Publishing, Inc. 2012. Source

Guei A.M.,University Abobo Adjame | Baidai Y.,University Abobo Adjame | Tondoh J.E.,Institute Deconomie Rurale Crra Of Sotuba | Huising J.,CIAT TSBF Nairobi c o ICRAF
Current Zoology | Year: 2012

A short term field mesocosm experiment was performed in semi-deciduous forest areas of Ivory Coast to assess the impact of a decompacting (Hyperiodrilus africanus, Eudrilidae) and two compacting (Millsonia omodeoi and Dichogaster terraenigrae, Acanthodrilidae) earthworm species on soil properties. These species have been selected for their predominance in the region and their contrasting impact on soil structure. The experimental design consisted of a treatment without worms (control), and treatments with one, two or three species of earthworms. Both compacting and decompacting earthworms increased water infiltration rate in all treatments, with marked impact in H. africanus and M. omodeoi+D. terraenigrae treatments. Interactions between compacting and decompacting species resulted in more large aggregates in comparison to when the compacting species D. terraenigrae was alone. This may be accounted for by their compacting attribute as compacting earthworms are responsible for producing the highest number of large aggregates. The low values of mean weight diameter in treatments combining decompacting and compacting earthworms compared with compacting M. omodeoi one also confirmed the trend of decline in soil compaction in the presence of the decompacting species. These results showed positive impact of species richness on soil structure regulation, which is crucial in ecosystem productivity and support consequently the insurance hypothesis. In fact, this study showed that the preservation of earthworm species belonging to these two contrasting functional groups is essential for the maintenance of stable soil structure regulation in agro-tropical ecosystems. © 2012 Current Zoology. Source

Akaffou D.S.,University Abobo Adjame | Hamon P.,IRD Montpellier | Doulbeau S.,IRD Montpellier | Keli J.,Center National Of Recherche Agronomique | And 5 more authors.
Tree Genetics and Genomes | Year: 2012

The inheritance and relationships between four traits of agronomic and quality interest-fructification time, caffeine, and heteroside contents and 100-bean weight-were analyzed in the first backcross hybrids derived from an interspecific cross between Coffea pseudozanguebariae and Coffea canephora. We showed that short vs. long fructification time was governed by one major gene with two co-dominant alleles ft1 and ft2. Absence vs. presence of both caffeine and heteroside was also controlled by one major gene. The allele responsible for the presence of caffeine (caf2) dominated over the absence one (caf1) whereas both alleles controlling heteroside, het1 and het2, were co-dominant. The fructification time and the heteroside content were additive while the caffeine content seemed multiplicative. The 100-bean weight was additive and under a polygenic control. The two genes ft and caf were linked, separated by 30.8 cM, and were independent from the het gene. The relationships between the four traits were not strong enough, except between 100-bean weight and fructification time (r = 0.43) or caffeine content (r = 0.41). Recombination occurred between the genes controlling the four traits suggesting that new introgressed Robusta varieties, characterized by short, medium, or long fructification time depending on demand, bigger seeds with low or no caffeine content, and being heteroside-free, could be produced. © 2012 Springer-Verlag. Source

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