Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.

Evolved resistance to xenobiotics and parasites is often associated with fitness costs when the selection pressure is absent. Resistance to the widely used microbial insecticide Bacillus thuringiensis (Bt) has evolved in several insect species through the modification of insect midgut binding sites...

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Autores principales:	Ikkei Shikano, Jenny S Cory
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/705683ffb1804e10a76a1efed7f25ebd
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spelling	oai:doaj.org-article:705683ffb1804e10a76a1efed7f25ebd2021-11-18T08:36:59ZGenetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.1932-620310.1371/journal.pone.0085709https://doaj.org/article/705683ffb1804e10a76a1efed7f25ebd2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24465656/?tool=EBIhttps://doaj.org/toc/1932-6203Evolved resistance to xenobiotics and parasites is often associated with fitness costs when the selection pressure is absent. Resistance to the widely used microbial insecticide Bacillus thuringiensis (Bt) has evolved in several insect species through the modification of insect midgut binding sites for Bt toxins, and reports of costs associated with Bt resistance are common. Studies on the costs of Bt-resistance restrict the insect to a single artificial diet or host-plant. However, it is well documented that insects can self-select appropriate proportions of multiple nutritionally unbalanced foods to optimize life-history traits. Therefore, we examined whether Bt-resistant and susceptible cabbage loopers Trichoplusia ni differed in their nutrient intake and fitness costs when they were allowed to compose their own protein:carbohydrate diet. We found that Bt-resistant T. ni composed a higher ratio of protein to carbohydrate than susceptible T. ni. Bt-resistant males exhibited no fitness cost, while the fitness cost (reduced pupal weight) was present in resistant females. The absence of the fitness cost in resistant males was associated with increased carbohydrate consumption compared to females. We demonstrate a sex difference in a fitness cost and a new behavioural outcome associated with Bt resistance.Ikkei ShikanoJenny S CoryPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 1, p e85709 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ikkei Shikano Jenny S Cory Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.
description	Evolved resistance to xenobiotics and parasites is often associated with fitness costs when the selection pressure is absent. Resistance to the widely used microbial insecticide Bacillus thuringiensis (Bt) has evolved in several insect species through the modification of insect midgut binding sites for Bt toxins, and reports of costs associated with Bt resistance are common. Studies on the costs of Bt-resistance restrict the insect to a single artificial diet or host-plant. However, it is well documented that insects can self-select appropriate proportions of multiple nutritionally unbalanced foods to optimize life-history traits. Therefore, we examined whether Bt-resistant and susceptible cabbage loopers Trichoplusia ni differed in their nutrient intake and fitness costs when they were allowed to compose their own protein:carbohydrate diet. We found that Bt-resistant T. ni composed a higher ratio of protein to carbohydrate than susceptible T. ni. Bt-resistant males exhibited no fitness cost, while the fitness cost (reduced pupal weight) was present in resistant females. The absence of the fitness cost in resistant males was associated with increased carbohydrate consumption compared to females. We demonstrate a sex difference in a fitness cost and a new behavioural outcome associated with Bt resistance.
format	article
author	Ikkei Shikano Jenny S Cory
author_facet	Ikkei Shikano Jenny S Cory
author_sort	Ikkei Shikano
title	Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.
title_short	Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.
title_full	Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.
title_fullStr	Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.
title_full_unstemmed	Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.
title_sort	genetic resistance to bacillus thuringiensis alters feeding behaviour in the cabbage looper, trichoplusia ni.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/705683ffb1804e10a76a1efed7f25ebd
work_keys_str_mv	AT ikkeishikano geneticresistancetobacillusthuringiensisaltersfeedingbehaviourinthecabbageloopertrichoplusiani AT jennyscory geneticresistancetobacillusthuringiensisaltersfeedingbehaviourinthecabbageloopertrichoplusiani
_version_	1718421567595085824

Genetic resistance to Bacillus thuringiensis alters feeding behaviour in the cabbage looper, Trichoplusia ni.

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