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Resistance Risk Assessment of Chilo Suppressalis to Bt Toxin and Influence of Temperature on Chilo Suppressalis

Author: LiShengBing
Tutor: HanLanZhi
School: Chinese Academy of Agricultural Sciences
Course: Agricultural Entomology and Pest Control
Keywords: Rice stem borer Bt toxic protein Resistance and eliminate the election Fitness costs Resistance Risk Assessment
CLC: S433.4
Type: Master's thesis
Year: 2011
Downloads: 48
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Abstract


In recent years, rice stem borer occurrence and growing infestation, stem borer prevention rely mainly on chemical control, but the long-term single chemical control has been to make the stem borer dimehypo (single), triazophos pesticide varieties resistance, prevention and treatment effect was significantly decreased, switched Transgenic rice successfully developed a new strategy for the prevention and treatment of the stem borer, but its ecological risk has also become the focus of growing concern. Therefore, through the resistance and eliminate election, resistant realized heritability analysis, the resistance predicted and resistant and susceptible populations ecological fitness comparison system evaluated the risks of stem borer resistance to Bt toxin for stem borer resistance management and sustainable applications of transgenic rice to provide a theoretical basis, the results are as follows: 1. Cry1Ac and Cry1Ab toxin proteins on the the Chilo suppressalis indoor and eliminate the election, 21 generation of continuous elimination of selected two populations to Cry1Ac rose to 8.42 times and 7.66 times respectively and Cry1Ab tolerance of realized heritability of resistance to Cry1Ac and Cry1Ab selected population were 0.018 and 0.065; realized heritability analysis. Resistance Prediction Analysis results showed that, when the the field selection pressure in the range of 50% to 90%, Chilo suppressalis Cry1Ac protein 10-fold increased tolerance to be 58 ~ 133 substituting need to 10 times of the the Cry1Ab toxin proteins increased tolerance 14 to 32 generations. Stem borer resistant sense populations of ecological fitness comparison, selected population there is a certain degree of fitness costs, mainly in: significantly longer duration of larval development of the selected population, larval survival rate was significantly lower than the sensitive populations, adult emergence rate was significantly lower than the susceptible population. From 1,2 research shows, the potential risk of resistance to stem borer Bt rice exist; rate more accurately predict the evolution of pest resistance to Bt crops, we intend to set up stem borer resistance evolution rate model; the The model in the two parts of the of Bt paddy fields and conventional rice population dynamics module and of Chilo suppressalis genetic modules composed mainly by stem borer. Rice stem borer population dynamics modules to form the main basis for pest development is based on the developmental threshold temperature and effective accumulated law; provide accurate model parameters to stem borer population dynamics and the evolution of resistance model, the study was carried out at different temperatures stem borer experimental population life tables. The results showed that the stem borer's development rate at 19 ~ 31 ℃ with increasing temperature accelerated and conform Lactin model; stem borer eggs, larvae, pupae, spawning early generation developmental threshold temperature were 13.18 ℃, 15.44 ℃, 10.85 ℃, 14.14 ℃ and 14.52 ° C the effective accumulated · 63.63,365.11,125.23,19.35 and 569.86 degrees; stem borer generation survival, fecundity and population growth index is the highest at 28 ℃ 61.2%, respectively, 159.53 / female and 39.0,28 ℃, temperature is the stem borer most appropriate mating, mating rate was 75.0%, the average number of spermatophore 1.6 / female; low temperature (19 ℃) and high temperature (34 ℃) affect the growth and development; stem borer Chilo suppressalis generation survival (S) and population trend index (I) and temperature (t) can be the quadratic parabola said: S =-0.3052x2 19.233x - 243.48 (r = 0.95) and I =-0.433x2 24.278x - 303.26 (r = 0.97).

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Plant pest and its control > Lepidoptera pests
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