insect hormones. manduca sexta rhodnius prolixus
TRANSCRIPT
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INSECT
HORMONES
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Manduca sexta
Rhodnius prolixus
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Main Endocrine Centres
Prothoracic (ecdysial) gland
Neurosecretory cells in VNC
Corpus allatum
Corpus cardiacum
Neurosecretory cells in SEG
Neurosecretory cells in brainBrain
Ovary
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Corpora cardiaca
Corpora allata
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Neuroendocrine Regulation
Central nervous system
Neurohemal organ
Neurosecretory cells
Neurohormone
Neurohormone
Hormone
Hormone
Endocrine gland
Target cell
• •• ••• • •• •
••
+/-
+/-+/-
+/-
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+/-Target cell
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Physiological Actions of Hormones
1. Metabolism and homeostasis * Metabolism of carbohydrates, lipids * Water balance and diuresis (excretion of water following a blood meal) * Cardioactive and muscle stimulation/inhibition
2. Growth, molting and metamorphosis
3. Reproduction
4. Diapause = state of arrested development * Any stage - egg, larval, pupal, adult
5. Phase or caste polymorphism * Social insects - ants, termites, honeybees * Locusts and aphids show phase polymorphism
6. Behaviour * During molting process * Migration * Reproductive behavior * Social behavior * Pheromones
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Sensitive periods for JH
JH level
Ecdysone level
4th instar 5th instar
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Outer epicuticle
Inner epicuticleEpicuticle
Exocuticle
Endocuticle
Epidermis
Basement membranePore canals
Procuticle
Moulting and Hormones
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Moulting Cycle (Part 1)
Step 1 Step 2 Step 3/4
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Moulting Cycle (Part 2)
Step 5-7 Ecdysis New Integument
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CH2
CH2
CH3
CH3
CH3
CH3
CH3
CH2
O
O
O
C
C
CH
H
H
C CH2
C
CH3
CH3
CH2
CH2
CH3
CH3
CH3
CH3
CH3
CH2
O
O
O
C
C
CH
H
H
C CH2
C
CH3
CH2
CH2
CH3
CH3
CH3
CH3
CH3
CH2
O
O
O
C
C
CH
H
H
C CH2
C
Ecdysone
Juvenile hormone I
Juvenile hormone II
Juvenile hormone III
20-Hydroxyecdysone
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Juvenile hormone
Penultimate larval instar Final larval instar Adult
JH sensitive period
JHTiter
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Corpus cardiacum
Corpus allatum
Brain (neurosecretory cells)
Production, storage and release of protothoracicotropic hormone (PTTH}
PTTH stimulates
Ecdysone (ec)
Juvenile hormone (JH)
Binding protein (JHBP)
JH-JHBP 20-hydroxyecdysone
chromosomes
RNA
Protein synthesis
Larval structures
chromosomes
RNA
Protein synthesis
Pupal structures
chromosomes
RNA
Protein synthesis
Adult structures
Action pathway for JH and Ecdysone
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Moulting video
http://www.vanderbilt.edu/exploration/news/news_bursicon.htm