PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.)
Newly ecdysed fourth instar larvae of the cotton leafworm, Spodoptera littoralis (Boisd.) were treated with LC50 of ecdysone agonist methoxyfenozide, to provide better insights into physiological symptoms and aspects induced by it as a mimic to the 20-hydroxyecdysone (20-E) action. Larvae ingest met...
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| Format: | Article |
| Language: | Arabic |
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The Union of Arab Universities
2009-03-01
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| Series: | Arab Universities Journal of Agricultural Sciences |
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| Online Access: | https://ajs.journals.ekb.eg/article_14884_ad69982c72b814bce51e1d602818c6f5.pdf |
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| author | E.A. Elwan H.E.A Sakr L.A . Youssef A.A . Abazied |
| author_facet | E.A. Elwan H.E.A Sakr L.A . Youssef A.A . Abazied |
| author_sort | E.A. Elwan |
| collection | DOAJ |
| description | Newly ecdysed fourth instar larvae of the cotton leafworm, Spodoptera littoralis (Boisd.) were treated with LC50 of ecdysone agonist methoxyfenozide, to provide better insights into physiological symptoms and aspects induced by it as a mimic to the 20-hydroxyecdysone (20-E) action. Larvae ingest methoxyfenozide died within 2-3 days, and being trapped within their excuvae. They stopped feeding shortly before ecdysis. Treatment neither accelerated ecdysis nor ceased feeding, as soon as the larvae ingest such 20-E mimic. The continuous binding of the compound to the ecdysteroid receptors of S. littoralis larvae increased the titre of enzymes regulated by 20-E during the experimental time (3 days). Chitinase and phenoloxidase were activated after 6 and 12 hr from methoxyfenozide administration, respectively. The compound had no effect on chitin production, but endocuticle chitin degradation during moulting might be depressed as illustrated by the presence of higher amount of N-acetylglucosamine in control larvae than methoxyfenozide treated. It is suggested that methoxyfenozide might induces a precocious moult by initiating moulting cycle, but its main toxic effect is due to the fact that its level remains high during moulting and don’t decrease for allowing other hormones necessary for successful moulting to be released. |
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| institution | Directory Open Access Journal |
| issn | 1110-2675 2636-3585 |
| language | Arabic |
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| publishDate | 2009-03-01 |
| publisher | The Union of Arab Universities |
| record_format | Article |
| series | Arab Universities Journal of Agricultural Sciences |
| spelling | doaj.art-ba60bbdb7ecc405b81f63c4eebf797f32024-03-07T17:45:44ZaraThe Union of Arab UniversitiesArab Universities Journal of Agricultural Sciences1110-26752636-35852009-03-0117120721510.21608/ajs.2009.1488414884PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.)E.A. Elwan0H.E.A Sakr1L.A . Youssef2A.A . Abazied3Plant Protection Research Institute, Agriculture Research Center, Dokki, CairoDep., Plant Protection, Faculty of Agriculture, Ain Shams University, Shobra El-KheimaDep., Plant Protection, Faculty of Agriculture, Ain Shams University, Shobra El-KheimaSugar Crops Research Institute, Agriculture Research Center, Giza, EgyptNewly ecdysed fourth instar larvae of the cotton leafworm, Spodoptera littoralis (Boisd.) were treated with LC50 of ecdysone agonist methoxyfenozide, to provide better insights into physiological symptoms and aspects induced by it as a mimic to the 20-hydroxyecdysone (20-E) action. Larvae ingest methoxyfenozide died within 2-3 days, and being trapped within their excuvae. They stopped feeding shortly before ecdysis. Treatment neither accelerated ecdysis nor ceased feeding, as soon as the larvae ingest such 20-E mimic. The continuous binding of the compound to the ecdysteroid receptors of S. littoralis larvae increased the titre of enzymes regulated by 20-E during the experimental time (3 days). Chitinase and phenoloxidase were activated after 6 and 12 hr from methoxyfenozide administration, respectively. The compound had no effect on chitin production, but endocuticle chitin degradation during moulting might be depressed as illustrated by the presence of higher amount of N-acetylglucosamine in control larvae than methoxyfenozide treated. It is suggested that methoxyfenozide might induces a precocious moult by initiating moulting cycle, but its main toxic effect is due to the fact that its level remains high during moulting and don’t decrease for allowing other hormones necessary for successful moulting to be released.https://ajs.journals.ekb.eg/article_14884_ad69982c72b814bce51e1d602818c6f5.pdfmethoxyfenozideecdysisagonistmoultingcotton leafowrmspodoptera littoralis |
| spellingShingle | E.A. Elwan H.E.A Sakr L.A . Youssef A.A . Abazied PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.) Arab Universities Journal of Agricultural Sciences methoxyfenozide ecdysis agonist moulting cotton leafowrm spodoptera littoralis |
| title | PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.) |
| title_full | PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.) |
| title_fullStr | PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.) |
| title_full_unstemmed | PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.) |
| title_short | PHYSIOLOGICAL SYMPTOMS INDUCED BY ECDYSONE AGONIST METHOXYFENOZIDE ON THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.) |
| title_sort | physiological symptoms induced by ecdysone agonist methoxyfenozide on the cotton leafworm spodoptera littoralis boisd |
| topic | methoxyfenozide ecdysis agonist moulting cotton leafowrm spodoptera littoralis |
| url | https://ajs.journals.ekb.eg/article_14884_ad69982c72b814bce51e1d602818c6f5.pdf |
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