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Life table and relative fitness of a strain Plutella xylostella resistant to Bacillus thuringiensis Cry1Ac toxin

Qin Yu

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Abstract

A resistant strain( DBM1Ac-R) of Plutella xylostella L.( diamondback moth) with more than 1 000-fold resistance to Cry1Ac was obtained. Life history characteristics,such as the development and fecundity of susceptible( DBM1Ac-S) and resistant strains,were studied. Life tables were established and the relative fitness cost of developing resistance analyzed. The results show that the DBM1Ac-R strain has distinct reproductive disadvantages,such as a fitness value of 0. 5762,including lower fecundity,hatching rate,pupation rate and sex ratio( ♀:♂),shorter egg period and lighter pupa weight,compared with the non-resistant DBM1Ac-S strain.

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What this paper is about

A resistant strain( DBM1Ac-R) of Plutella xylostella L.( diamondback moth) with more than 1 000-fold resistance to Cry1Ac was obtained. Life history characteristics,such as the development and fecundity of susceptible( DBM1Ac-S) and resistant strains,were studied. Life tables were established and the relative fitness cost of developing resistance analyzed. The results show that the DBM1Ac-R strain has distinct reproductive disadvantages,such as a fitness value of 0. 5762,including lower fecundity,hatching rate,pupation rate and sex ratio( ♀:♂),shorter egg period and lighter pupa weight,compared with the non-resistant DBM1Ac-S strain.

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Available abstract

A resistant strain( DBM1Ac-R) of Plutella xylostella L.( diamondback moth) with more than 1 000-fold resistance to Cry1Ac was obtained. Life history characteristics,such as the development and fecundity of susceptible( DBM1Ac-S) and resistant strains,were studied. Life tables were established and the relative fitness cost of developing resistance analyzed. The results show that the DBM1Ac-R strain has distinct reproductive disadvantages,such as a fitness value of 0. 5762,including lower fecundity,hatching rate,pupation rate and sex ratio( ♀:♂),shorter egg period and lighter pupa weight,compared with the non-resistant DBM1Ac-S strain.

Key concepts: Plutella, Diamondback moth, Biology, Fecundity, Cry1Ac, Bacillus thuringiensis, Pupa, Hatching

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Life table and relative fitness of a strain Plutella xylostella resistant to Bacillus thuringiensis Cry1Ac toxin — Research Paper | ScholarLens