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Strawberry (Fragaria spp.): Cultivation, Production, Consumption, and Marketing in Cameroon

Agricultural Sciences 2024年第4期15卷 449-471页

作者： Djeuani Astride Carole Moutamal Djem Rose Theophine Derricka Mbouobda Hermann Désiré Abdoulaye Souaibou Meliga Essimi Célestine Bouopda Nono Joël Anafack Donasson Dioril Messouang Bernard Didier Ndongo III Boris Charlen Kaffo Emmanuel Kamga Fossouo Anselme Xavier tiki antoine marie kevin Nyimiebolo Bengono Audrey Maguy Manuela Diobe Motassy Adounga Samuel Brice Amama Amama Benjamin Nshanji Jones Panguepko Fendju Christophe Nzie Oussena Nguetrapouna Issofa Mpon Ikoyin Linda NKouéya Christelle Ladone Amang Amang A. Ziem Niemenak Nicolas Laboratory of Plant Physiology and Biochemistry Department of Biological Sciences Higher Teachers&#8217 Training College University of Yaound&#233 1 Yaound&#233 Cameroon Department of Plant Biology Faculty of Science University of Yaound&#233 1 Yaound&#233 Cameroon Department of Biology Higher Teachers&#8217 Training College Bambili University of Bamenda Bamenda Cameroon Mbidjoro Sustainable Living Environment Ngaound&#233r&#233 Cameroon Cé r&#232s Agricole Yaound&#233 Cameroon KAFFO Farm Baham Cameroon Agro Ankh Dschang Cameroon Bio Farm of Lolodorf Lolodorf Cameroon Or Rouge d’ Afrique Obala Cameroon Bafoussam Farm Bafoussam Cameroon King Farms Baham Cameroon Department of Microbiology Faculty of Science University of Yaound&#233 1 Yaound&#233 Cameroon

Strawberry (Fragaria spp.) is one of the most important fruits classified as exotic fruits imported into Cameroon. To have an inventory of its cultivation in Cameroon, a survey study was carried out among eight farms of Fragaria spp. from January 2021 to February 2022. The plant was introduced in Cameroon in 2018. There are 13 varieties of Fragaria spp. currently cultivated. Among these 13 varieties, eleven are hybrids of Fragaria x ananassa (“Amiga”, “Amine”, “Camarosa”, “Chandler”, “Charlotte”, “Elsanta”, “Gariguette”, “Madame Moutot”, “Ostara”, “Ruby gem” and “San Andreas”), and two of the hybrids of Fragaria vesca (“Maestro” and “Mara des bois”). The cropping system, irrigation system, and type of fertilizers applied differ from one strawberry farm to another. Biofertilizers (such as mycorrhizal), inorganic and organic fertilizers are actually used to improve production. The potential annual production of strawberries from January 2021 to February 2022, estimated based on the survey data, was 21.216 tons for all growers. Among these eight production farms, the Lolodorf BIO Farm presents 6000 kg (six tons) of strawberries and 100,000 stolons (seedlings) produced, from seven varieties of Fragaria spp. cultivated, with 6 varieties which are hybrids variety Fragaria x ananassa (“Amiga”, “Amine”, “Chandler”, “Gariguette”, “Madame Moutot”, and “Ruby gem”), and one which is a hybrid of Fragaria vesca (“Mara des bois”). Certain diseases were also observed and recorded depending on the growing areas.

关键词： Fragaria spp. Cultivation Technique Attack of Pathogens Annual Production Cameroon

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Morphological Characterization of Arbuscular Mycorrhizal Fungi Associated with the Rhizosphere According to the Age of Xanthosoma sagittifolium L. Schott Plants in the Field

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American Journal of Plant Sciences 2024年第3期15卷 161-179页

作者： Audrey Maguy Bengono Nyimiebolo Astride Carole Djeuani Hermann Désiré Mbouobda antoine marie kevin tiki Theresa Akinimbom Moma Diobe Motassy Manuela Samuel Brice Adounga Christophe Fendju Pangueko Jones Nshanji Issofa Nguetrapouna Rose Theophine Derricka Djem Moutamal A. Ziem Amang Amang Nicolas Niemenak Laboratory of Plant Physiology Department of Biological Sciences Higher Teacher Training College (HTTC) University of Yaoundé I Yaoundé Cameroon Department of Plant Biology Faculty of Sciences University of Yaoundé I Yaoundé Cameroon Department of Biology Higher Teacher Training College Bambili (HTTC) The University of Bamenda Bamenda Cameroon Departments of Microbiology Faculty of Science University of Yaoundé 1 Yaoundé Cameroon

The objective of this work was to carry out a morphological characterization of arbuscular mycorrhizal fungi in the rhizosphere of Xanthosoma sagittifolium L. Schott plants. The plant material used was the white and red cultivars of X. sagittifolium, belonging to age intervals of 3 - 6, 6 - 9, and 9 - 12 months. Three harvest sites were chosen in the Central Region of Cameroon. In each site, soil from the rhizosphere and plant roots was collected in a randomized manner. In the field, the agronomic parameters were evaluated. The physicochemical characteristics of the soils, the mycorrhization index, and the morphological characterization of the mycorrhizal types of each site were carried out. The results obtained show that the agronomic growth parameters varied significantly using the Student Newman and Keuls Test depending on the harvest sites. The soils’ pH in all sites was acidic and ranged between 4.6 and 5.8. The Nkometou site has a loamy texture while the Olembe and Soa sites have loam-clay-sandy and loam-clay textures respectively. The highest mycorrhization frequencies appeared at the Nkometou site, with 75 and 87.33% of the white and red cultivars plant roots at 6 - 9 and 3 - 6 months. The relative abundance of AMF arbuscular mycorrhizal fungal spores in the rhizosphere of X. sagittifolium plants varied with age and cultivar. There were 673 spores between 9 - 12 months in Nkometou in the red cultivar. Six AMF genera were identified in all the different soils collected: Acaulospora sp., Funneliformis sp., Gigaspora sp., Glomus sp., Scutellospora sp., and Septoglomus sp. The genus Glomus sp. was the most present at all age intervals in both cultivars.

关键词： Xanthosoma sagittifolium L. Schott Rhizosphere Harvest Site Arbuscular Mycorrhizal Fungi Diversity

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High-finesse Fabry-Perot cavities with bidimensional Si_(3)N_(4) photonic-crystal slabs

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Light(Science & Applications) 2016年第1期5卷 320-327页

作者： Xu Chen Clément Chardin kevin Makles Charles Caër Sheon Chua Rémy Braive Isabelle Robert-Philip Tristan Briant Pierre-François Cohadon antoine Heidmann Thibaut Jacqmin Samuel Deléglise Laboratoire Kastler Brossel UPMC-Sorbonne UniversitésCNRSENS-PSL Research UniversityCollège de France4 place JussieuCase 74F75252 ParisFrance Current address:IBM Research-Zürich Säumerstrasse 48803 RüschlikonSwitzerland Laboratoire de Photonique et de Nanostructures LPN-CNRS/CNRS Route de Nozay91460 MarcoussisFrance UniversitéParis Diderot Sorbonne Paris Cité75207 ParisFrance

Light scattering by a two-dimensional photonic-crystal slab(PCS)can result in marked interference effects associated with Fano *** devices offer appealing alternatives to distributed Bragg reflectors and filters for various applications,such as optical wavelength and polarization filters,reflectors,semiconductor lasers,photodetectors,bio-sensors and non-linear optical *** PCS also have natural applications in the field of optomechanics,where the mechanical modes of a suspended slab interact via radiation pressure with the optical field of a high-finesse *** reflectivity and transmission properties of a defect-free suspended PCS around normal incidence can be used to couple out-of-plane mechanical modes to an optical field by integrating it in a free-space *** we demonstrate the successful implementation of a PCS reflector on a high-tensile stress Si_(3)N_(4) *** illustrate the physical process underlying the high reflectivity by measuring the photonic-crystal band ***,we introduce a clear theoretical description of the membrane scattering properties in the presence of optical *** embedding the PCS inside a high-finesse cavity,we fully characterize its optical *** spectrally,angular-and polarization-resolved measurements demonstrate the wide tunability of the membrane’s reflectivity,from nearly 0 to 99.9470±0.0025%,and show that material absorption is not the main source of optical ***,the cavity storage time demonstrated in this work exceeds the mechanical period of low-order mechanical drum *** so-called resolved-sideband condition is a prerequisite to achieve quantum control of the mechanical resonator with light.

关键词： Fano resonance high-reflectivity membrane low-loss optical reflector nanomembrane resonator photonic-crystal slab quantum optomechanics

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