Queen differentiation and mortality after topical application of different juvenile hormone analogues on worker larvae of the honey bee (Apis mellifera L.)

1977 ◽  
Vol 24 (3) ◽  
pp. 264-264 ◽  
Author(s):  
G. M. Copijn ◽  
J. Beetsma ◽  
P. Wirtz
Keyword(s):  
Apis Mellifera ◽  
Juvenile Hormone ◽  
Honey Bee ◽  
Topical Application ◽  
Juvenile Hormone Analogues

scholarly journals Transcriptional Control of Honey Bee (Apis mellifera) Major Royal Jelly Proteins by 20-Hydroxyecdysone

Insects ◽  
2018 ◽  
Vol 9 (3) ◽  
pp. 122 ◽  
Author(s):  
Paul Winkler ◽  
Frank Sieg ◽  
Anja Buttstedt
Keyword(s):  
Gene Expression ◽  
Apis Mellifera ◽  
Juvenile Hormone ◽  
Honey Bee ◽  
Honey Bees ◽  
Transcriptional Control ◽  
Royal Jelly ◽  
Adult Worker ◽  
Gene Expression Dynamics

One of the first tasks of worker honey bees (Apis mellifera) during their lifetime is to feed the larval offspring. In brief, young workers (nurse bees) secrete a special food jelly that contains a large amount of unique major royal jelly proteins (MRJPs). The regulation of mrjp gene expression is not well understood, but the large upregulation in well-fed nurse bees suggests a tight repression until, or a massive induction upon, hatching of the adult worker bees. The lipoprotein vitellogenin, the synthesis of which is regulated by the two systemic hormones 20-hydroxyecdysone and juvenile hormone, is thought to be a precursor for the production of MRJPs. Thus, the regulation of mrjp expression by the said systemic hormones is likely. This study focusses on the role of 20-hydroxyecdysone by elucidating its effect on mrjp gene expression dynamics. Specifically, we tested whether 20-hydroxyecdysone displayed differential effects on various mrjps. We found that the expression of the mrjps (mrjp1–3) that were finally secreted in large amounts into the food jelly, in particular, were down regulated by 20-hydroxyecdysone treatment, with mrjp3 showing the highest repression value.

scholarly journals DIFFERENTIAL TOXICITY OF PYRETHROID AND ORGANOPHOSPHATE INSECTICIDES TO THE HONEY BEE, APIS MELLIFERA AND THE YELLOW FEVER MOSQUITO, AEDES AEGYPTI

2021 ◽  
Vol 68 (1) ◽  
pp. 70-78
Author(s):  
Hussein Sanchez-Arroyo
Keyword(s):  
Apis Mellifera ◽  
Aedes Aegypti ◽  
Honey Bee ◽  
Yellow Fever ◽  
Topical Application ◽  
Honey Bees ◽  
Commercial Formulation ◽  
Differential Toxicity ◽  
Paper Method ◽  
Potential Use

Six insecticide active ingredients (AIs) and five commercial insecticide formulations were applied by topical application and onto filter paper strips to determine differential toxicity to Aedes aegypti (L.) and Apis mellifera (L.), and to evaluate their potential use in future insecticide resistance monitoring surveys. For topical application, 0.1 or 1 µl of the technical insecticide solution was applied to the Ae. aegypti and A. mellifera thorax, respectively. For insecticide-impregnated strips the insecticide amount varied, according with the commercial formulation. By topical application deltamethrin was the most toxic AI (LD 50 = 0.057 µg/g) to Ae. aegypti and prallethrin was least toxic (LD 50 = 19.42 µg/g). For A. mellifera, the most toxic AIs were deltamethrin (LD 50 = 0.013 µg/g) and bifenthrin (LD50 = 0.156 µg/g); and the least toxic was chlorpyrifos (LD 50 = 3.246 µg/g). When the insecticide-impregnated papers method was used, Mosquitomist Two (chlorpyrifos 24.6%) was the most toxic insecticide for Ae. aegypti (LC50 = 0.024 µg/cm2 ), and Aqualuer (permethrin 20.6%, PBO 20.6%) was least toxic (LC50 = 0.408 µg/cm2 ). For A. mellifera the most toxic commercial insecticide formulations were Talstar (bifenthrin 7.9%; LC50 = 0.288 µg/cm2 ) and Mosquitomist Two (LC50 = 0.299 µg/cm2 ), with no significant differences, and the least toxic commercial formulation was Deltagard (deltamethrin 2.0%; LC50 = 15.084 µg/cm2 ). By topical application, more than 28 times of chlorpyrifos was needed to obtain the same mortality in A. mellifera as in Ae. aegypti. When using the insecticide-impregnated paper method, more than 206 times of Deltagard was needed to obtain the same mortality in A. mellifera as in Ae. aegypti. Even though Mosquitomist Two was the most toxic insecticide for both insect species, the honey bees were >12 times more tolerant to this insecticide, compared with the mosquitoes.

scholarly journals Juvenile Hormone Biosynthesis Gene Expression in the corpora allata of Honey Bee (Apis mellifera L.) Female Castes

PLoS ONE ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e86923 ◽  
Author(s):  
Ana Durvalina Bomtorin ◽  
Aline Mackert ◽  
Gustavo Conrado Couto Rosa ◽  
Livia Maria Moda ◽  
Juliana Ramos Martins ◽  
...  
Keyword(s):  
Gene Expression ◽  
Apis Mellifera ◽  
Juvenile Hormone ◽  
Honey Bee ◽  
Corpora Allata ◽  
Juvenile Hormone Biosynthesis ◽  
Biosynthesis Gene ◽  
Hormone Biosynthesis
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