Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes
A complete profile of the 20-hydroxyecdysone (20-HE) titer, development and endocrine events from 1st instar to pupation of the larvae of non-diapause-destined (NDD) and diapause-destined (DD) tasar silkworm, Antheraea mylitta Drury (Lepidoptera: Saturniidae) was studied. Diapause is induced by shor...
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| Format: | Article |
| Language: | English |
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Institute of Entomology, Biology Centre, Czech Academy of Science
2008-10-01
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| Series: | European Journal of Entomology |
| Subjects: | |
| Online Access: | https://www.eje.cz/artkey/eje-200804-0007_Endogenous_20-hydroxyecdysone_levels_in_the_haemolymph_of_non-diapause-destined_and_diapause-destined_generatio.php |
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| author | Dinesh KUMAR Bhattiprolu SUBRAHMANYAM Shashi K. SHARAN Pradeep K. MISHRA Bishwa M.K. SINGH Nagabathula SURYANARAYANA |
| author_facet | Dinesh KUMAR Bhattiprolu SUBRAHMANYAM Shashi K. SHARAN Pradeep K. MISHRA Bishwa M.K. SINGH Nagabathula SURYANARAYANA |
| author_sort | Dinesh KUMAR |
| collection | DOAJ |
| description | A complete profile of the 20-hydroxyecdysone (20-HE) titer, development and endocrine events from 1st instar to pupation of the larvae of non-diapause-destined (NDD) and diapause-destined (DD) tasar silkworm, Antheraea mylitta Drury (Lepidoptera: Saturniidae) was studied. Diapause is induced by short days of 11 hr photophase coupled with <= 24°C prevailing in September-November. Diapausing pupae produce adults in July (>= 12h light, >= 26°C) and one generation is completed by August. The growth rate during the course of development of larval instars decreases and instar durations are inversely related to the body weight at the time of initiation of a larval instar. A growth compensation mechanism operates during the development of the larval instars. The growth rate was higher in early instars (1st to 4th) in both generations. The DD larvae complete the final instar in 16 days followed by a spinning stage of 13 days. The NDD larvae complete the final larval instar in 9 days followed by spinning stage of 6 days and spend 14 days in the pupal stage. The signal to release the prothoracicotropic hormone (PTTH) is related to critical body weight of larvae. From 1st to 4th instar, pre-ecdysial peaks of 20-HE were recorded in both NDD and DD generations. The programme for undergoing diapause was initiated during 3rd instar and induced by a sudden decrease in the level of 20-HE in the DD generation. Two peaks of 20-HE are required for the larval-pupal transformation, first at the wandering stage and the second at cuticle formation. |
| first_indexed | 2024-12-13T12:04:14Z |
| format | Article |
| id | doaj.art-85024565cc08467f93da1357e53314d2 |
| institution | Directory Open Access Journal |
| issn | 1210-5759 1802-8829 |
| language | English |
| last_indexed | 2024-12-13T12:04:14Z |
| publishDate | 2008-10-01 |
| publisher | Institute of Entomology, Biology Centre, Czech Academy of Science |
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| series | European Journal of Entomology |
| spelling | doaj.art-85024565cc08467f93da1357e53314d22022-12-21T23:47:00ZengInstitute of Entomology, Biology Centre, Czech Academy of ScienceEuropean Journal of Entomology1210-57591802-88292008-10-01105459159810.14411/eje.2008.079eje-200804-0007Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changesDinesh KUMAR0Bhattiprolu SUBRAHMANYAM1Shashi K. SHARAN2Pradeep K. MISHRA3Bishwa M.K. SINGH4Nagabathula SURYANARAYANA5Silkworm Physiology Laboratory, Central Tasar Research and Training Institute, P.O. Piska-Nagri, Ranchi-835303, India; e-mail: dineshumrao@rediffmail.comDivision of Entomology, Indian Agricultural Research Institute, New Delhi 110 012, India; e-mail: bhattiprolu_s@yahoo.comSilkworm Physiology Laboratory, Central Tasar Research and Training Institute, P.O. Piska-Nagri, Ranchi-835303, India; e-mail: dineshumrao@rediffmail.comSilkworm Physiology Laboratory, Central Tasar Research and Training Institute, P.O. Piska-Nagri, Ranchi-835303, India; e-mail: dineshumrao@rediffmail.comSilkworm Physiology Laboratory, Central Tasar Research and Training Institute, P.O. Piska-Nagri, Ranchi-835303, India; e-mail: dineshumrao@rediffmail.comSilkworm Physiology Laboratory, Central Tasar Research and Training Institute, P.O. Piska-Nagri, Ranchi-835303, India; e-mail: dineshumrao@rediffmail.comA complete profile of the 20-hydroxyecdysone (20-HE) titer, development and endocrine events from 1st instar to pupation of the larvae of non-diapause-destined (NDD) and diapause-destined (DD) tasar silkworm, Antheraea mylitta Drury (Lepidoptera: Saturniidae) was studied. Diapause is induced by short days of 11 hr photophase coupled with <= 24°C prevailing in September-November. Diapausing pupae produce adults in July (>= 12h light, >= 26°C) and one generation is completed by August. The growth rate during the course of development of larval instars decreases and instar durations are inversely related to the body weight at the time of initiation of a larval instar. A growth compensation mechanism operates during the development of the larval instars. The growth rate was higher in early instars (1st to 4th) in both generations. The DD larvae complete the final instar in 16 days followed by a spinning stage of 13 days. The NDD larvae complete the final larval instar in 9 days followed by spinning stage of 6 days and spend 14 days in the pupal stage. The signal to release the prothoracicotropic hormone (PTTH) is related to critical body weight of larvae. From 1st to 4th instar, pre-ecdysial peaks of 20-HE were recorded in both NDD and DD generations. The programme for undergoing diapause was initiated during 3rd instar and induced by a sudden decrease in the level of 20-HE in the DD generation. Two peaks of 20-HE are required for the larval-pupal transformation, first at the wandering stage and the second at cuticle formation.https://www.eje.cz/artkey/eje-200804-0007_Endogenous_20-hydroxyecdysone_levels_in_the_haemolymph_of_non-diapause-destined_and_diapause-destined_generatio.phplepidopterasaturniidaeantheraea mylittatasar silkwormpupal diapauseendocrine eventsptth20-he titer |
| spellingShingle | Dinesh KUMAR Bhattiprolu SUBRAHMANYAM Shashi K. SHARAN Pradeep K. MISHRA Bishwa M.K. SINGH Nagabathula SURYANARAYANA Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes European Journal of Entomology lepidoptera saturniidae antheraea mylitta tasar silkworm pupal diapause endocrine events ptth 20-he titer |
| title | Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes |
| title_full | Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes |
| title_fullStr | Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes |
| title_full_unstemmed | Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes |
| title_short | Endogenous 20-hydroxyecdysone levels in the haemolymph of non-diapause-destined and diapause-destined generations of tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) and associated developmental changes |
| title_sort | endogenous 20 hydroxyecdysone levels in the haemolymph of non diapause destined and diapause destined generations of tasar silkworm antheraea mylitta lepidoptera saturniidae and associated developmental changes |
| topic | lepidoptera saturniidae antheraea mylitta tasar silkworm pupal diapause endocrine events ptth 20-he titer |
| url | https://www.eje.cz/artkey/eje-200804-0007_Endogenous_20-hydroxyecdysone_levels_in_the_haemolymph_of_non-diapause-destined_and_diapause-destined_generatio.php |
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