Effects Of Climate Change On The Interaction BetweenNilaparvata Lugens (Stal) And Two Genotypes Of Rice

In this study, we used the open-top chambers (OTCs) to simulate the atmospheric CO2concentration and temperature rise at night, setting up4different conditions as eCeT, eCaT, aCeT, aCaT (e:elevated, a:ambient; eC:750μL/L CO2; aC:370μL/LCO2; aT:ambient temperature; eT:2℃exceed ambient temperature at night). Potted rice was planted in the OTCs, we test photosynthesis, plant height, measured nutrients and other norms in different genotypes rice (TN1, susceptible rice; IR56, insect-resistant rice) who grows under the different treatments, in order to survey the effects of the physiological and biochemical on different genotypes rice when the climate changed. According to food intake, fecundity, nymph survival, development duration and other parameters, we probed how can BPH fit on the different genotypes rice when the climate changed.We obtained the following important results:(1) elevated CO2levels raises the photosynthetic capacity of two genotypes rice, while promotes the growth of their height. The IR56rice photosynthetic capacity can be reduced by warming night. Interaction between CO2enriched and elevated night temperature weakes IR56rice photosynthesis ability and C/N, improving TNI plant height. Compared with the normal processing, elevated CO2concentration and temperature at night as well as their interaction changes the free amino acids insignificantly in different rice sheath, but increases nutrient content in the sheath.(2) The fitness of BPH fed on the TN1rice. There is no significant effect on food consumption and survival probability of the BPH caused by elevated CO2concentration. But it reduces the amino acid content in the honeydew and extends the BPH nymph developmental duration and increases brachypterous female’s differentiation, reducing the fecundity of the F1generation; increased night temperature can improve the fecundity of the BPH, offsetting the effects from high concentrations of CO2, and increasing F1generation of the BPH. So we can forecast that climate change will lead to the BPH population growth which fed on the TN1rice.The results of the fitness of the BPH fed on the IR56rice shows that: the high concentration of CO2increases the free amino acids in the BPH honeydew, enhancing the fecundity of the BPH and their nymphs’survival. The development Duration of the BPH nymphs can be decreased and the brachypterous female’s differentiation will be increased under the elevated CO2concentration, which is advantageous to the development of the BPH populations. Raising night temperature can promote the brown planthopper’ fecundity, and increase the survival probability of nymphs, slacking down the promotional effects from the elevated CO2. In brief, climate change will promote the BPH’s population, which is fed on the IR56rice.