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Pollination Efficiency of Amegilla calens(Hymenoptera: Apidae) on Gossypium hirsutumL. (Malvaceae) Variety L457 Flowers at Meskine (Maroua, Cameroon)

Agricultural sciences（农业科学） 2021年第10期

作者： Issaya Kodji Issaya Beaudelaine Stephanie Kengni Sidonie Fameni Tope fernand-nestor tchuenguem fohouo(department of biological sciences Faculty of Science University of Maroua Maroua Cameroon)

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Agricultural sciences 2021年第10期12卷 1150-1167页

作者： Issaya Kodji Issaya Beaudelaine Stephanie Kengni Sidonie Fameni Tope fernand-nestor tchuenguem fohouo department of biological sciences Faculty of Science University of Maroua Maroua Cameroon

Animal pollination is a key of reproduction of more plants species including Gossypium hirsutum. This Malvaceae is the best cultivated oilseed plant in tropical and subtropical regions in the world. This research evaluates the interaction between Amegilla calens and Gossypium hirsutum from 2018 to 2019 based on the activities of the solitary bee on the flowers of this plant and their productive impact in field. The experiment was focused on four repeated treatments during the flowering phase: the first two were characterised by the existence or absence of protection of the flowers regarding all insects and the other two made up of flowers designed for the exclusive visit of A. calens or open then protected again without a visit from an insect or any other organism. Daily rhythm of activity, behavioural ecology, the pollination efficiency, the fruiting rate, the number of seeds per capsule and the percentage of normal seeds were evaluated. Among twenty insects species recorded A. calens is the most abundant with 30.72% of 655 visits and the most efficient pollinator. Amegilla calens is active on G. hirsutum flowers from 6 a.m. to 5 p.m. with a maximum activity situated from 8 a.m. to 9 a.m. All visits of this solitary bee are able to fertilize the flowers of Malvaceae. The mean duration of a visit per flower for pollen harvest is also more important (23.57 ± 0.96 sec) than nectar collection (13.69 ± 0.72 sec). For the two years, through its pollination efficiency, A. calens increased the fruiting rate by 20.30%, as well as the percentage of normal seeds by 32.39%. Therefore, we concluded that A. calens is the important pollinator and increases the fecundity and number of normal seeds of G. hirsutum.

关键词： Amegilla calens Gossypium hirsutum Meskine Pollination Efficiency Yields

Agronomic Performances of Compost Associated with Pollinating Insects on the Growth and Yield of Glycine max (L.) Merril under Field Conditions

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Open Journal of Ecology 2022年第3期12卷 175-197页

作者： Mohamadou Moussa Kengni Beaudelaine Stephanie Steve Takoukam Toukam Albert Ngakou tchuenguem fohouo fernand-nestor department of Parasitology and Parasitic Pathologies School of Science and Veterinary Medicine University of Ngaoundere Ngaoundere Cameroon department of biological sciences Faculty of Science University of Maroua Maroua Cameroon department of biological sciences Faculty of Science University of Ngaoundere Ngaoundere Cameroon

Soybean is an oilseed crop legume cultivated for its benefits as a source of protein to human or animal food. The cultivation of soybean will promote the diversification of income sources for rural population. Like other crops, soybean flowers are visited by insects. It is expected that within the biodiversity conservation program, anthophilous insects including bees, generally increase fruit and seed yields of many plant species. Therefore, the effect of insect pollinators and compost on growth and yield parameters of Glycine max was assessed for two cropping seasons (2018 and 2019) in the field. The experiment was set up in a complete randomized block design with three treatments: subplots applied with compost;subplots applied with fertilizer-NPK;subplots applied neither with compost, nor with fertilizer-NPK. Two other treatments were designed by plants with flowers protected against insects or flowers pollination free. Results indicate that root nodules formed by soybean plants in plots that received compost were significantly higher (P G. max flowers respectively. Lipotriches collaris was the most insect species frequently observed in the field, with 44.20% and 43.34% visits yearly respectively. The synergistic effect of insects and compost increased the number of seeds per pod by 28.27% and the percentage of normal seeds by 24.47%. Hence, applying Glycine max seeds at sowing with compost and in an environment with hives close to field could be recommended in agricultural development programs of farmers for a sustainable improvement of pods and seed yield of this valuable crop.

关键词： Soybean Lipotriches collaris Compost Pollination Yields

Foraging and Pollination Behaviour of Apis mellifera adansonii Latreille （Hymenoptera, Apidae） on Gossypium hirsutum （Malvaceae） Flowers at Dang （Ngaoundere, Cameroon）

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Journal of Agricultural Science and Technology(A) 2013年第4期3卷 267-280页

作者： Mazi Sanda tchuenguem fohouo Femand-nestor Briackner Dorothea department of biological sciences University of Ngaounddrd P.O. Box 454 Ngaounddrd Cameroon Forschungsstelle ffir Bienenkunde Universitdt Bremen FB2 Postfach 330440 28334 Bremen Germany

To evaluate Apis mellifera adansonii Latreille impact on fruit and seed yields of Gossypium hirsutum L., its foraging and pollinating activities were studied in Ngaoundere for two seasons. Observations were made on 340 flowers each year and divided in three treatments. The treatments included unlimited flowers access by all visitors; bagged flowers to deny all visits and limited visits by Apis mellifera adansonii only. The worker bees seasonal rhythm of activity, its foraging behaviour, its pollination efficiency, the fruiting rate, the number of seeds per fruit and the percentage of normal seeds were evaluated. Results show that this bee foraged G. hirsutum flowers throughout the whole blooming period. This bee species intensely harvested pollen and nectar. The mean foraging speed was 9.41 flowers per rain in 2009 and 8.41 flowers per min in 2010. The fruiting rate, the number of seeds per fruit and the percentage of normal seeds of unprotected flowers were significantly higher than those of flowers protected from insects. Through its pollination efficiency, Apis mellifera adansonii provoked a significant increment of the fruiting rate by 60.84% in 2009 and 36.48% in 2010, as well as the number of seeds per fruit by 94.16% in 2009 and 31.41% in 2010, and the percentage of normal seeds by 94.23% in 2009 and 33.49% in 2010. The installation ofA. m. adansonii colonies close to G. hirsutum fields could be recommended to increase fruit, seed and honey yields, and pollen production as a hive product in the region.

关键词： Gossypium hirsutum Apis mellifera adansonii foraging pollination

Anthocleistenolide B, a New Secoiridoid from Anthocleista liebrechtsianaDe Wild &T. Durand

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Advances in biological Chemistry 2019年第4期9卷 135-142页

作者： Francis T. Ngouafong Roland T. tchuenguem Jonas Kühlborn Billy T. Tchegnitegni Beaudelaire K. Ponou Rémy B. Teponno Jean P. Dzoyem Till Opatz Léon A. Tapondjou department of Chemistry Faculty of Science University of Dschang Dschang Cameroon department of Biochemistry Faculty of Science University of Dschang Dschang Cameroon Institute of Organic Chemistry Johannes Gutenberg University Mainz Mainz Germany

Drug resistance due to the extensive abuse and over-use of antibiotics has become an increasingly serious problem and researchers started to use plants as an alternative source of new antibiotics. The aim of the present study was to assess the antimicrobial properties of secondary metabolites isolated from A. liebrechtsiana. A new secoiridoid derivative, anthocleistenolide B (1), along with three known compounds, the monoterpene diol, djalonenol (2), the xanthone O-glycoside, decussatin 1-O-β-D-glucopyranoside and the fatty acid, dotriacontanoic acid (4) was isolated from the leaves and bark of this plant. Their structures were elucidated by extensive analysis of spectroscopic (1D and 2D NMR) and mass spectrometric data. The isolated compounds were screened for their antimicrobial properties against five strains of bacteria (two gram positive: Staphylococcus aureus 29213, Enterococcus faecalis ATCC 25922 and three gram negative: Escherichia coli ATCC51299, Proteus mirabilis (isolate), and Pseudomonas aeruginosa QC76110), but all were inactive.

关键词： Anthocleista liebrechtsiana Anthocleistenolide B Antimicrobial Properties

Ethnobotany, Pharmacology and Phytochemical Investigations of the Seeds of Pentaclethra macrophyllaBenth (Mimosaceae)

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Advances in biological Chemistry 2021年第3期11卷 126-141页

作者： Pierre V. K. Sinda Beaudelaire K. Ponou Borice T. Tsafack Jonas Kühlborn Roland T. tchuenguem Rémy B. Teponno Jean P. Dzoyem Till Opatz Léon A. Tapondjou Research Unit of Environmental and Applied Chemistry Department of Chemistry Faculty of Science University of Dschang Dschang Cameroon department of Chemistry Johannes Gutenberg University Duesbergweg Mainz Germany Research Unit of Microbiology and Antimicrobial Substances Department of Biochemistry Faculty of Science University of Dschang Dschang Cameroon

Phytochemical investigation of the seeds of Pentaclethra macrophylla led to the isolation of a mixture of two new aromatic monoterpene glycosides, pentamacrophylloside A (1a) and pentamacrophylloside B (1b), together with six known secondary metabolites: Comososide (2), secopentaclethroside (3), caffeoylputrescine (4), β-sitosterol-3-O-β-D-glucopyranoside (5), 2-hydroxymethyl-5-(2-hydroxypropan

关键词： Pentaclethra macrophylla Ethnobotany Pharmacology Aromatic Monoterpenoids Chemophenetic Significance Antimicrobial Activity