Koffi Tozo - Academia.edu (original) (raw)

Papers by Koffi Tozo

European Scientific Journal, ESJ, Jan 31, 2014

In this study, we tested the possibility of using C. occidentalis L., as green manure, compost an... more In this study, we tested the possibility of using C. occidentalis L., as green manure, compost and improved fallows to regenerate degraded soil. Methods: In some plots of the degraded soil, we buried biomass of Cassia occidentalis and others were either treated with compost of Cassia with or without ash, or performed from improved fallow of Cassia. All the treated plots were then used for a maize culture (Zea mays, var IKENE). The experimental design was that of Fischer with 9 treatments and 4 replicates per treatment. Results: The study showed that the best values for plant height were scored for the plots treated with the green manure of Cassia and the plots treated with compost +ash. The greatest values of grain yields and mass of 1000 grains were obtained for the plots treated with green manure of Cassia and those treated with compost without ash. About the fertility of the treated soil after harversting, the highest values for nitrogen content were scored for the plots treated with compost of cassia containing or not ash whereas highest values for phosphorus content were obtained for the plots treated with the green manure of Cassia. For the the potassium content, the bests results were scored for the plots treated with composts containing ash. Conclusion: these results showed that C. Occidentalis was a convenient

BackgroundThe indigenous chicken production has become an integral part of the smallholder farmin... more BackgroundThe indigenous chicken production has become an integral part of the smallholder farming systems in Africa, this practice helps in diversifying household income and providing food for the rural community. Products from the indigenous chickens are preferred due to its taste and flavour, however, characterized by small body size and slow productive performance, meat production from this chicken has not met the high demand in Togo. Crossbreeding using exotic breeds can improve productivity of the indigenous chickens without sacrificing its genetic potentials. This study was aimed at improving the Wassache chicken, F1 generation of the crosses between the Wassache and Sasso chickens were simultaneously evaluated for growth traits, mortality and carcass yield in a pure and reciprocal crossbreeding experiment. Data on body weight, feed intake, feed conversion ratio, and mortality were collected on 400 birds for 12 weeks. On the 12th week of study, 20 birds from each genotype wer...

Heliyon

The role of agriculture in Benin, Western Africa cannot be overemphasized, where livestock produc... more The role of agriculture in Benin, Western Africa cannot be overemphasized, where livestock production is a major occupation among the rural population as it serves as a means of livelihood and sustenance. This study was carried out to examine the socioeconomic correlates of guinea fowl production status in Benin and to characterize their management practices. 165 farmers across 10 regions in Benin were selected using the non-probabilistic snowball sampling method. Information on farmers' socio-economics, management practices and constraints to optimum production were elicited with the aid of a structured questionnaire and subjected to analysis. The results showed that across all the 10 regions surveyed, guinea fowl farming was the dominant occupation, particularly among men (81.0%) irrespective of sociolinguistic groups, religion and level of education. About one-third (34.5%) of the farmers had no formal education. In terms of characterization, four clusters of guinea fowl farmers were identified based on geographical location, educational level, management technique and farming experience. The constraints to guinea fowl production were slow growth and high mortalities as a result of diseases (40.7%) and predators (29.1%). Improvement in feeding (30%) and veterinary care (33.9%) were part of suggestions made by farmers to increase the productivity of the birds. The study concluded that adequate technical support and scientific research are inevitable in this sector as this will considerably improve the rural populations living conditions through enhanced income and therefore constitute a real lever for rural development.

Additional file 2: Fig. S1. Total ions current (TIC) overlapping map of QC samples mass spectrome... more Additional file 2: Fig. S1. Total ions current (TIC) overlapping map of QC samples mass spectrometry results. Fig. S2. MRM, metabolite detection multimodal graph of the QC sample. Fig. S3. Heatmap of the correlations analysis between samples. Fig. S4. The score plots of OPLS-DA pairwise comparisons of differential metabolites. Fig. S5. OPLS-DA verification diagram result for the pairwise comparison of differential metabolites. Fig. S6. Heatmap of the 50 differential metabolites between WF and PF (a), and Relative content of some up-regulated bioactive metabolites in sesame leaves (b). Fig. S7. KEGG annotations and enrichment of differentially expressed metabolites of the pairwise comparison between ML vs FC (a), and WF vs ML (b).

International Journal of Biological and Chemical Sciences, 2022

Le déficit hydrique est le principal facteur abiotique qui limite la productivité des cultures da... more Le déficit hydrique est le principal facteur abiotique qui limite la productivité des cultures dans les conditions de l'agriculture pluviale. L’objectif de cette étude a été d’identifier les variétés de cotonnier (Gossypium. hirsutum) tolérantes au déficit hydrique au Togo. Pour cela, 117 accessions et une variété témoin de G. hirsutum ont été caractérisées sous les régimes hydriques optimal et déficitaire. Le dispositif expérimental a été un Alpha lattice avec 120 objets en trois répétitions. Onze caractéristiques agromorphologiques ont été mesurées. Les indices de sensibilité (DSI) et de tolérance (STI) au déficit ont été calculés. Les résultats ont révélé une grande variabilité au déficit hydrique au sein des accessions testées. Le déficit hydrique a entrainé une réduction du rendement en coton graine de 85%. Par ailleurs, nous avons noté qu’en condition de déficit, le rendement a été corrélé négativement avec le DSI et positivement avec les indices STI et GMP. Quatre groupes...

mutant in maize: effects on lignification, fibre development,

SSRN Electronic Journal, 2022

Lannea microcarpa est un fruitier spontane des savanes du Nord-Togo. Sa population en declin, es... more Lannea microcarpa est un fruitier spontane des savanes du Nord-Togo. Sa population en declin, est pauvre en individus juveniles. La presente etude a ete conduite afin d’analyser le potentiel de regeneration de l’espece dans les unites geomorphologiques de la region. Soixante (60) placeaux de 5000 m2 relevant d’un inventaire ponctuel ont ete installes dans les peuplements de l’espece dans les plaines, sur les plateaux et les collines rocheuses. Les donnees collectees ont concerne les hauteurs de tous les individus. Les plaines seules, ayant presente des cohortes de semis, 10 placeaux permanents y ont ete retenus pour le suivi de la regeneration. Les plaines ont presente une abondance significative plus elevee de nouveaux semis (p = 0,008) par rapport aux plateaux et collines. Cependant, les taux de juveniles devant etre recrutes dans la population adulte ne different pas pour ces trois situations topographiques (p = 0,112). Cela s’explique par le fait que les jeunes plants ne duren...

International Journal of Innovation and Applied Studies, 2015

Cowpea (Vigna unguiculata L.Walp.) is a basic food product which is cultivated in the savannas of... more Cowpea (Vigna unguiculata L.Walp.) is a basic food product which is cultivated in the savannas of west Africa. Its cultivation is confronted to biotic and abiotic constraints. The abiotic constraints are primarily of climatic types (recorded rainfall, temperature). The bad spatio-temporal distribution of recorded rainfall as well as the high temperatures accentuate the drought which blocks the production of cowpea. The aim of the study is to identify the varieties of cowpea that is adapted to the cultivation of dry season, (ii) to determine the suitable hydrous mode and its (their) period(s) in the year favorable to the cultivation of dry season of cowpea. Thus, two varieties of cowpea- KN1 and KVX 61.1 -were cultivated in pots of six (06) liters in real medium, during the hot period of the year. The trials were separated by a fifteen (15) days interval. Each variety was subjected to three hydrous modes from the 14th days after sowing. The environmental, morphological and agronomic ...

Revue Marocaine des Sciences Agronomiques et Vétérinaires, 2017

CABI Reviews, 2021

The investigation of the nutritional value of Neglected and Underutilized Crop Species is essenti... more The investigation of the nutritional value of Neglected and Underutilized Crop Species is essential for their valorization. This global systematic review aimed at investigating the nutritional value of tigernut to highlight the importance of the species in the fight against malnutrition. Extensive searches were carried out through three databases (ScienceDirect, Google Scholar, and African Journal Online) from March to April 2021, and studies were screened and extracted using the established systematic review methods. A total of 36 papers from Africa, America, Asia, and Europe met the inclusion criteria. Thematic synthesis was used to synthesize data, and findings were presented under three framework aspects (biochemical, mineral composition, and vitamin content). About 63.88% of the papers included in this global review were published from 2010 to 2020. The highest number of papers ( n = 14) was recorded between 2015 and 2020, and most of the publications were from Europe ( n = 1...

African Journal of Agricultural Research, Dec 17, 2015

Jatropha curcas L. is a plant species from the family of Euphorbiaceae. The extraction of oil fro... more Jatropha curcas L. is a plant species from the family of Euphorbiaceae. The extraction of oil from its seeds produces a cake for which its accumulation causes different environmental problems related to solid waste management. The valorization of this cake into compost could be a contribution to solving this problem. Therefore different types of compost were made with J. curcas seed cake associated with animal feces incorporated at 0, 10 and 20% rate. To achieve their combination, 5 composting test and 2 replicates each have been set up. These composts were tested on cabbage yield in a completely randomized design with 6 treatments and 3 replicates. The different composts have improved significantly the chemical characteristics of the soil and the cabbage biomass yield. Mixing J. curcas seed cake with 10% sheep's droppings (C 10) gave chemical characteristics compost with a high N and K content (Total-N 18.32 g.kg-1 ; Total-K 17.60 g.kg-1). The compost made with J. curcas seed cake and 20% sheep's droppings (C 20) had the best cabbage total biomass and shoots of cabbage biomass yields respectively 43.11±3.15×10 3 and 21.56±1.58×10 3 kg.ha-1. That compost C 20 could be recommended to farmers for the improvement of crop yield field after trials followed by validation.

Metabolomics, 2019

Introduction The brown planthopper (BPH, Nilaparvata lugens Stål, Hemiptera: Delphacidae) is one ... more Introduction The brown planthopper (BPH, Nilaparvata lugens Stål, Hemiptera: Delphacidae) is one of the most devastating insect pests of the crucially important cereal crop, rice (Oryza sativa L.). Currently, multiple BPH-resistant rice varieties have been cultivated and generalized to control BPH. However, the defence metabolic responses and their modes of action against BPH in different rice cultivars remain uncharacterized. Objective We used a non-biased metabolomics approach to explore the differences in metabolite profiles in response to BPH infestation in the susceptible TN1 rice cultivar and two resistant cultivars (IR36 and IR56). Methods The metabolomic detection based on gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS) was performed to investigate the content changes of identified metabolites in TN1, IR36 and IR56 rice varieties at various time points (0 h, 24 h, 48 h and 96 h) post BPH feeding. The differentially expressed metabolites were screened and the corresponding metabolic pathways were further enriched. Results The results showed that compared to that in TN1, the content changes of most primary metabolites were more stable, but the concentration alterations of some defence-related metabolites were more acute and persistent in IR36 and IR56. Furthermore, the differentially expressed pathways analysis revealed that cyanoamino acids and lipids metabolism was persistently induced in IR36, but changes in thiamine, taurine and hypotaurine metabolism were more significant in IR56 during BPH infestation. Besides, the contents of quercetin and spermidine which were harmful to BPH fitness, were significantly elevated by BPH in TN1 and IR36, and the quercetin level was significantly decreased during BPH feeding in IR56. Conclusion The results of the differences in metabolite profiles in response to BPH infestation in different rice cultivars were useful to clarify the metabolic mechanism of rice plants during BPH infestation and to provide new resources to control this insect pest.

Journal of Applied Biosciences, 2017

Variation de la réponse physiologique et agronomique du niébé (Vigna unguiculata L.Walp) à différ... more Variation de la réponse physiologique et agronomique du niébé (Vigna unguiculata L.Walp) à différentes dates de semis au Burkina Faso.

AFRICAN JOURNAL OF BIOTECHNOLOGY

Sweet potato (Ipomoea batatas) is an hexaploide plant with complex incompatibility that reduces c... more Sweet potato (Ipomoea batatas) is an hexaploide plant with complex incompatibility that reduces chances of self-fertilization. In vitro culture of sweet potato by means of biotechnological approaches is an advantage for its study and variety improvement. Three sweet potato cultivars from Togo: Damadoami, Tombolo, Nagohé were grown on Murashige and Skoog (MS) medium with or without indole-3-butyric acid (IBA), and the morphogenetic properties of the plantlets obtained were compared. Uninodal stem explants were used. The reactivity of explants grown on MS differed according to the cultivar and the clone. Addition of IBA induced embryogenesis and root neoformations. The growth depended on the genotype, the clone, and the cultivar. The cultivar Damadoami was the most reactive on MS medium. Plantlets were acclimated easily and can be transferred to the field

International Journal of Biological and Chemical Sciences, 2013

Haematostaphis barteri est un fruitier spontané rencontré au nord du Togo sur les cuestas et sur ... more Haematostaphis barteri est un fruitier spontané rencontré au nord du Togo sur les cuestas et sur la chaîne montagneuse de l'Atakora. L'étude compare les structures de sa population dans ces deux sites (de différents degrés de pression humaine) dans le but de proposer une piste pour sa conservation. Les données relatives au diamètre et à la hauteur d'H. barteri ont été collectées dans 80 placeaux installés suivant sa densité sur le terrain, pour le calcul des paramètres dendrométriques et la construction des courbes de distribution. La densité moyenne d'H. barteri sur les cuestas est 1,6 fois supérieure à celle de l'Atakora. Les distributions en cloche assez similaires indiquent que l'espèce régresse dans les deux sites. Ceci se confirme par les coefficients d'asymétrie positifs, traduisant un déclin des populations. Cela est dû notamment au très faible potentiel de régénération de l'espèce (environ 1 individu/ha). Les cuestas bien que sous forte emprise humaine semblent constituer l'habitat privilégié d'H. barteri au Togo. La protection de tous les individus est nécessaire sur les cuestas et sur l'Atakora pour assurer la conservation in situ de l'espèce.

Planta, 2012

Ozone induces a stimulation of the phenylpropanoid and lignin biosynthesis pathways in leaves but... more Ozone induces a stimulation of the phenylpropanoid and lignin biosynthesis pathways in leaves but the response of wood, the main lignin-producing tissue, is not well documented. The purpose of this study was to compare the responses of phenylpropanoid and lignin pathways in leaves and stem wood by a simultaneous analysis of both organs. Young poplars (Populus tremula 9 alba) were subjected either to daylight ozone (200 nL L-1 during light period) or continuous ozone (200 nL L-1 during light and dark periods) in controlled chambers. The trees were tilted so as to limit the formation of tension wood to the upper side of the stem and that of opposite wood to the lower side. Continuous ozone fumigation induced more pronounced effects in leaves than daylight ozone. Tension wood and opposite wood displayed similar responses to ozone. Enzyme activities involved in phenylpropanoid and lignin biosynthesis increased in the leaves of ozone-treated poplars and decreased in the wood. All steps involved in phenylpropanoid and monolignol synthesis in leaves and stem wood, were also altered at the transcript level (except coniferyl aldehyde 5-hydroxylase in leaves) suggesting that the responses were tightly coordinated. The response occurred rapidly in the leaves and much later in the wood. Phenylpropanoid and lignin biosynthesis is probably first involved in a defensive role against ozone in the leaves, which would lead to considerable rerouting of the carbon skeletons. The later response of phenylpropanoid and lignin metabolism in wood seemed to result from readjustment to the reduced carbon supply.

Genetic Resources and Crop Evolution, 2022

Journal of Agriculture and Environment for International Development, 2015

Knowing how well fruit species root sucker naturally, can be used to start development programs, ... more Knowing how well fruit species root sucker naturally, can be used to start development programs, based on methods to multiply vegetatively, which do not cost much, especially in zones of adverse pedoclimatic and socioeconomic conditions. This study was carried out on the densities of natural root suckers of S. birrea in three areas (reserved forests, mature and new fallows), as well as on particular characteristics of these root suckers. This up to date study shows that the amount of root suckers in the mature fallows (34.28 ± 22.28 root suckers / ha) is significantly superior (p = 0.005) to those of the new fallows (12.36 ± 7.98 root suckers / ha). 41.1% of mature S. birrea produces some, and more than 70 % of the mature ones, which root sucker, have 1 to 3 suckers. Half of the root suckers are carried by roots with a diameter between 2 and 4 cm. Under the crown of the mother plants, we can count 41 % of the root suckers, whereas the rest grow in the full light. Less than 17 % esca...

1 Laboratoire de Physiologie et Biotechnologie Vegetales, Faculte des Sciences, Universite de Lom... more 1 Laboratoire de Physiologie et Biotechnologie Vegetales, Faculte des Sciences, Universite de Lome, BP : 1515 ; Lome, Togo. 2 Laboratoire de Botanique et Ecologie Vegetales, Faculte des Sciences, Universite de Lome, BP : 1515 ; Lome, Togo. 3 Laboratoire de Virologie et de Biotechnologie Vegetales, Ecole Superieure d’Agronomie, Lome, Togo. 4 Institut Agronomique et Veterinaire Hassan II Complexe Horticole, Agadir Maroc. 5 Faculte universitaire des Sciences agronomiques de Gembloux, Unite de Biologie vegetale Passage des Deportes, 2 5030 Gembloux, Belgique. 6 Universite des AntillesGuyane, BP 250, 97157 Pointe -aPitre, Cedex 09 (Guadeloupe), France.