scholarly journals Differential and comparative screening of cowpea varieties to Striga gesnerioides (Willd.) Vatke for race specific identification in Burkina Faso

1970 ◽  
Vol 29 (1) ◽  
pp. 101-118
Author(s):  
P. Sawadogo ◽  
T.J. Ouedraogo ◽  
Z. Dieni ◽  
T.B.J. Batieno ◽  
N. Sawadogo ◽  
...  
Keyword(s):  
Burkina Faso ◽  
Intraspecific Variability ◽  
Intraspecific Diversity ◽  
Research Station ◽  
Striga Gesnerioides ◽  
Resistant Varieties ◽  
Artificial Infestation ◽  
Cowpea Varieties ◽  
Specific Reactions

Significant efforts have been made to develop cowpea (Vigna unguiculata (L.) Walp.) varieties resistant to Striga gesnerioides in Burkina Faso. Despite these efforts, the resistant genotypes developed still express differential responses to Striga gesnerioides in different zones of the country. This suggests existence of intraspecific variability within the parasite. The objective of this study was to assess the intraspecific variability of cowpea genotypes to Striga gesnerioides infection in Burkina Faso. Ten cowpea varieties were screened over two consecutive years, under artificial infestation with 30 ecotypes of Striga seeds at Kamboinsé research station, in a screenhouse in Burkina Faso. Cowpea varieties used included Moussa local, Komsaré and KVx404-8-1, which are susceptible to all Striga ecotypes; and varieties B301, IT93K-693-2 and IT82D-849, which are free from all Striga ecotypes infestation. Cowpea varieties Tiligré, 524B, local Gorom and Niizwè had specific reactions depending on the ecotypes. The study highlights the existence of varietal specificities according to the geographical origin of Striga gesnerioides seeds. The structuring of the intraspecific diversity showed five biotypes, of which three were clearly identified as SG1, SG5 and SG Kp races; and two biotypes could not be identified. Although this study did not allow for a clear determination of the racial affiliation of the two new biotypes, it offers the possibility of developing new strategies to control Striga by focusing on the selection of resistant varieties based on regional specificities of Striga races in each agricultural zone.

scholarly journals Varieties’ Response of Vegetable Cowpea to Mechanical Inoculation of Cowpea Aphid-Borne Mosaic Virus in Burkina Faso

2021 ◽  
Vol 78 (2) ◽  
pp. 29
Author(s):  
Antoine BARRO ◽  
Joseph NANAMA ◽  
Zinmanké COULIBALY ◽  
Zakaria DIENI ◽  
Mirela CORDEA
Keyword(s):  
Mosaic Virus ◽  
Block Design ◽  
Research Station ◽  
Strong Correlations ◽  
Mechanical Inoculation ◽  
Progress Curve ◽  
Resistant Varieties ◽  
Cowpea Aphid ◽  
Cowpea Varieties ◽  
Severity Class

Vegetable cowpea is eaten mainly fresh, in the form of young, immature pods, tender and sweet like the common bean. However, like cowpea with seeds, vegetable cowpea experience yield losses due to the cowpea aphid-borne mosaic virus (CABMV). This study aims to improve yields through the development of vegetable cowpea varieties resistant to CABMV. The study focused on ten varieties of vegetable cowpea, carried out in a greenhouse at the Kamboinsé research station using a randomized complete block design with three replications, all inoculated with CABMV. The data collection concerned resistance parameters. Mechanical inoculation made it possible to observe various symptoms of CABMV, thus highlighting the existence of variability within the varieties tested. Strong correlations were observed between several variables. Thus, the varieties of vegetable cowpea IT85F-2089-5, UG-CP-8, IT85F-2805-5 and Telma were identified as resistant, because belonging to the low severity classes and having a low value of area under the disease progress curve. On the other hand, the varieties RW-CP-5, UG-CP-6, IT83S-911, niébé baguette grimpant possessing a high severity class were judged to be susceptible. These resistant varieties will thus be able to contribute to the improvement of production and the protection of cowpea resources in Burkina.

scholarly journals Inheritance and Allelic Relationships of Alectra vogelii Benth. Resistance Genes in Cowpea Genotypes B301 and KVx414-22-2

2021 ◽  
Vol 13 (8) ◽  
pp. 10
Author(s):  
Zakaria Dieni ◽  
Jean-Baptiste De La Salle Tignegre ◽  
Benoit T. Joseph Batieno ◽  
Felicien W. M. Serge Zida ◽  
Abdou Kader Congo
Keyword(s):  
Burkina Faso ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Goodness Of Fit ◽  
Dominant Gene ◽  
Research Station ◽  
Single Dominant Gene ◽  
Goodness Of Fit Test ◽  
Allelic Relationship ◽  
Resistant Varieties

Alectra vogelii Benth. is the second most important parasitic weed in cowpea [Vigna unguiculata (L.) Walp.] production in Burkina Faso. Several resistant varieties to this weed have been identified in the country among which are B301 and KVx414-22-2. The inheritance and allelic relationships of the resistance genes in the two varieties have not been studied with A. vogelii strains in Burkina Faso. The objective of this study was to determine the inheritance and allelic relationship of the resistance genes in B301 and KVx414-22-2. To determine the inheritance of the genes for resistance, the resistant varieties (B301 and KVx414-22-2) were each crossed to a susceptible variety IT82D-849 to generate F1 and F2 populations. For the allelic relationship study the two resistant genotypes were crossed among themselves to generate F1 and F2 offspring. The parents and their F1 and F2 progenies were screened in artificially infested pots with Alectra seed in a screen house at Kamboinsé Research Station in Burkina Faso. Resistance/susceptibility of genotypes was assessed by recording the number of emerged Alectra shoots. The data were subjected to the Chi-Square goodness-of-fit test for one, two and three genes segregation ratios. The results revealed that two independent dominant genes confer resistance in the variety B301 and a single dominant gene confers resistance in variety KVx414-22-2. The single dominant gene in KVx414-22-2 is non-allelic to the two genes in B301. The two resistance genes in variety B301 have already been named Rav1 and Rav2 whilst Rav3 is the name of the resistance gene in variety IT81D-994. Therefore, we propose the symbol Rav4 as the name for the resistance gene in variety KVx414-22-2.

scholarly journals Technical Note: Quantification of interferences of wet chemical HONO LOPAP measurements under simulated polar conditions

2008 ◽  
Vol 8 (22) ◽  
pp. 6813-6822 ◽  
Author(s):  
J. Kleffmann ◽  
P. Wiesen
Keyword(s):  
Technical Note ◽  
Swiss Alps ◽  
Pollution Level ◽  
Research Station ◽  
Polar Regions ◽  
Alpine Research ◽  
Absorption Photometer ◽  
Present Pilot Study ◽  
Good Agreement

Abstract. In the present pilot study, an optimized LOPAP instrument (LOng Path Absorption Photometer) for the detection of nitrous acid (HONO) in the atmosphere (DL 0.2 pptV) was tested at the high alpine research station Jungfraujoch at 3580 m altitude in the Swiss Alps under conditions comparable to polar regions. HONO concentrations in the range <0.5–50 pptV with an average of 7.5 pptV were observed at the Jungfraujoch. The diurnal profiles obtained exhibited clear maxima at noon and minima with very low concentration during the night supporting the proposed photochemical production of HONO. In good agreement with recent measurements at the South Pole, it was demonstrated, that interferences of chemical HONO instruments can significantly influence the measurements and lead to considerable overestimations, especially for low pollution level. Accordingly, the active correction of interferences is of paramount importance for the determination of reliable HONO data.

scholarly journals DIPTEROCARPACEAE INVENTORY AT KETAMBE RESEARCH STATION, GUNUNG LEUSER NATIONAL PARK

2016 ◽  
Vol 7 (3) ◽  
pp. S83-S85
Author(s):  
Essy Harnelly ◽  
Iqbar . ◽  
Fauziah . ◽  
Agus Sara ◽  
Nir Fathiya ◽  
...  
Keyword(s):  
National Park ◽  
Research Station ◽  
Purposive Sampling ◽  
Number Of Species ◽  
Sampling Plot

This research was about Dipterocarpaceae inventory at Ketambe Research Station, Gunung Leuser National Park. The research was done on July 2015. Determination of sampling plot was using purposive sampling. The parameter observed was species as well as number of species. The result showed that there were 5 species of Dipterocarpaceae found in the sampling plot. All the species found were belongs to tribe of Shoreae namely; Shorea johorensis, Shorea parvifolia, Hopea dryobalanoides, Shorea lepidota, and Parashorea lucida.Key words: Dipterocarpaceae, inventory, Gunung Leuser National Park

scholarly journals Determination of the optimal dose and date of application of mineral manure on sesame (sesamum indicum L.) in Burkina Faso

2021 ◽  
Vol 14 (9) ◽  
pp. 2992-3000
Author(s):  
Amos Miningou ◽  
Vanessa Golane ◽  
Appolinaire Sy Traore ◽  
Hyacinthe Kambire
Keyword(s):  
Burkina Faso ◽  
Cost Effective ◽  
Optimal Dose ◽  
Fertilizer Application ◽  
Sesamum Indicum ◽  
Optimum Dose ◽  
Mineral Fertilizers ◽  
Morphological Development ◽  
Split Plot

The decrease in soil fertility is the main cause of low crops yields in Burkina Faso. It is therefore necessary to make a supply of fertilizers to increase yields. This is the reason why during the 2015 rainy season from July to October, a study was conducted on sesame fertilization in Souri located in the Province du Mouhoun. The goal of our study is to fertilize plants with increasing doses of mineral fertilizers at different application dates on sesame. The objective is to determine the optimum dose and date of fertilizer application to increase the yields. For this purpose four NPK (14-23-14) fertilizer treatments have been experimented with following doses NPK0 (0kg.ha-1), NPK50 (50 kg.ha-1) NPK100 (100kg.ha-1) NPK150 (150 kg.ha-1) with three application dates (sowing, 15 DAS, 30 DAS) in Fisher’s completely randomized blocks with four replications in split-plot. The results showed that NPK doses had an effect on sesame throughout morphological development (height, number of ramifications, number of capsules) and yield performance. Yields have increased according to the doses applied in the following order: NPK0 (226 kg.ha-1) < NPK50 (348 kg.ha-1) <NPK100 (550 kg.ha-1) <NPK150 (593 kg.ha-1). Through economic calculations, the NPK100 dose with 550 kg.ha-1 yield can be chosen as the most cost-effective dose for producers. The application dates of NPK had various effects on sesame that emerged on the height and grain yield. The plants had the best performance on the date of application of the 15 DAS (475 kg.ha-1) followed by the application at planting time (450 kg.ha-1) and at the end the application on 30 DAS (375 kg.ha-1). Interaction between the doses and the dates of application of fertilizer is significant and should be considered in sesame. La baisse de la fertilité des sols est une cause des faibles rendements au Burkina Faso. Ainsi, il faudra faire de bons apports d’engrais pour augmenter les rendements. Dans ce cadre, une étude a été conduite de juillet à octobre 2015 à Souri dans la Province du Mouhoun. Il s’est agi d’apporter des doses croissantes de fumure minérale à différentes dates d’application sur le sésame. L’objectif est de déterminer la dose et la date d’application optimales de la fumure minérale. A cet effet quatre traitements de doses d’engrais NPK (14-23-14) : NPK0 (0 kg.ha-1), NPK50 (50 kg.ha-1), NPK100 (100kg.ha-1), NPK150 (150 kg.ha-1) ont été appliqués selon trois dates d’application (au semis, le 15ème JAS, le 30ème JAS) dans un dispositif expérimental en blocs de Fisher à 4 répétitions avec un arrangement en split-plot. Les résultats obtenus ont montré que les doses NPK ont un effet positif sur le sésame à travers son développement morphologique (sa hauteur, ses ramifications, ses capsules) et son rendement. Les rendements obtenus ont permis de classer les doses selon cet ordre croissant : NPK0 (266 kg.ha-1) <NPK50 (348 kg.ha-1) <NPK100 (550 kg.ha-1) <NPK150 (593kg.ha-1). L’évaluation économique effectuée sur la base du ratio valeur sur coût (RVC) a permis de retenir la dose NPK100 comme étant la plus rentable pour les producteurs. Les dates d’applications NPK sur le sésame ont également des effets visibles sur la hauteur et le rendement en grain. Le meilleur rendement est obtenu avec l’application du NPK 15 JAS (475 kg.ha-1) suivi de l’application au semis (450 kg.ha-1) et enfin de celle effectuée au 30ème JAS (375 kg.ha-1). L’interaction doses et dates d’application d’engrais NPK doit être considérée chez le sésame.

scholarly journals Geographical distribution and alternate hosts of Striga gesnerioides (Willd.) Vatke in Burkina Faso

2020 ◽  
Vol 145 ◽  
pp. 14955-14964
Author(s):  
Pingawindé SAWADOGO ◽  
◽  
Benoit Joseph BATIENO ◽  
Zakaria DIENI ◽  
Nerbéwendé SAWADOGO ◽  
...  
Keyword(s):  
Burkina Faso ◽  
Geographical Distribution ◽  
Alternate Hosts ◽  
Striga Gesnerioides

scholarly journals Characteristics of farmers’ selection criteria for cowpea (Vigna unguiculata) varieties differ between north and south regions of Burkina Faso

2019 ◽  
Vol 56 (1) ◽  
pp. 94-103
Author(s):  
Haruki Ishikawa ◽  
Issa Drabo ◽  
Batieno B. Joseph ◽  
Satoru Muranaka ◽  
Christian Fatokun ◽  
...  
Keyword(s):  
Burkina Faso ◽  
Vigna Unguiculata ◽  
Selection Criteria ◽  
Stepwise Multiple Regression ◽  
Seed Colour ◽  
Early Maturity ◽  
Improved Varieties ◽  
Cowpea Varieties ◽  
Selection Factors ◽  
North And South

SummaryComparative analysis of preferences and key criteria for selecting cowpea (Vigna unguiculata L. Walp.) varieties was conducted using the data collected from farmers’ participatory varietal selection (FPVS) activities conducted over 3 years with a total of 2401 farmers (1230 male and 1171 female) in 13 villages in Tougouri department in northern region and Tiéfora department in southern region of Burkina Faso in West Africa. Over the 3 years, farmer criteria for variety selection remained basically stable, but some variations among the regions and years were noticed. Grain yield was the most common and the most important criterion for farmers’ choice in both regions. Farmers in Tougouri (north) put more emphasis on early maturity (90%) and drought resistance (19.7%) as selection criteria than farmers in Tiéfora (south). Farmers in Tiéfora placed statistically significant importance on seed colour and plant type, while farmers in Tougouri did not, and for these selection criteria, there were only slight differences between genders in both areas. Results of stepwise multiple regression indicated that maturity and seed colour in the north, and seed size and seed colour in the south were the most important selection factors for farmers to select cowpea varieties. Improved varieties should have sufficiently good yield to be accepted, but other favoured traits may differ by target region as a reflection of local and regional market demands as well as deep-rooted cultural preferences. Understanding local and regional differences in selection criteria for cowpea varieties is necessary to improve the acceptance of newly released improved varieties. Preferences identified in the participatory activities could inform further development of cowpea breeding strategies for north and south regions of Burkina Faso.

A discussion on orbital analysis - Radio tracking at Winkfield

1967 ◽  
Vol 262 (1124) ◽  
pp. 46-49
Keyword(s):  
Space Flight ◽  
Joint Venture ◽  
Radio Telemetry ◽  
Research Station ◽  
Radio Tracking ◽  
Goddard Space Flight Center ◽  
Telemetry Measurements ◽  
Orbital Analysis ◽  
The U.S

Winkfield is one of the stations in the Space Tracking and Data Acquisition Network (Stadan) of the U.S. National Aeronautics and Space Administration (N.A.S.A.) and is operated by the Radio and Space Research Station as a joint venture with N.A.S.A. The stations in the network, using standardized equipment supplied by N.A.S.A., receive by radio telemetry measurements from the various experiments in the satellites, they command the functioning of satellites and they track them. Tracking, with which this paper is concerned, means the measurement of quantities which contribute to the determination of the positions of satellites as a function of time. About ten stations in the network use tracking equipment and methods identical with those used at Winkfield. The network operates 24 h a day, its functioning being coordinated by the Goddard Space Flight Center of N.A.S.A. by means of teleprinter circuits which also serve to convey the raw tracking information from the stations to the N.A.S.A. computer facilities.

scholarly journals Performance of cowpea varieties under Striga gesnerioides (Willd.) Vatke infestation using biplot analysis

Euphytica ◽  
2017 ◽  
Vol 213 (11) ◽  
Author(s):  
Lucky O. Omoigui ◽  
Alpha Y. Kamara ◽  
Hakeem A. Ajeigbe ◽  
Richard O. Akinwale ◽  
Michael P. Timko ◽  
...  
Keyword(s):  
Striga Gesnerioides ◽  
Biplot Analysis ◽  
Cowpea Varieties
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