Assessment of impact of climate change with reference to elevated CO2 on rice brown planthopper, Nilaparvata lugens (Stal.) and crop yield

作者：Prasannakumar N R; Chander Subhash^*; Pal Madan

来源：Current Science, 2012, 103(10): 1201-1205.

• Brown planthopper
• climate change
• elevated CO2
• rice

Impact of elevated CO2 on the rice brown planthopper (BPH), Nilaparvata lugens (Stal.) population and rice yield was assessed in open-top chambers during kharif 2010 and 2011. Brachypterous females laid more eggs (324.3 +/- 112.3 eggs/female) on the rice plants exposed to elevated CO2 (570 +/- 25 ppm) than 380 ppm ambient CO2 (231.7 +/- 31.8 eggs). Elevated CO2 exhibited positive effect on BPH multiplication and resulted in more than a doubling of its population (435.4 +/- 62.0 hoppers/hill) at peak incidence compared to ambient CO2 (121.4 +/- 36.8 hoppers/hill) during kharif 2010; corresponding populations being 113.0 +/- 11.5 and 47.0 +/- 8.1 hoppers/hill during kharif 2011 respectively. Besides, honeydew excretion was observed to be 74.41% more under elevated CO2 (187.6 +/- 44.8 mm(2)/5 females) than ambient CO2 (48 +/- 20.1 mm(2)/5 females). On the other hand, high CO2 exhibited nutritive effect on uninfested rice crop through 21.6%, 15.3% and 14.1% increase in the number of tillers, reproductive tillers and seeds/panicle respectively, and as a consequence increased grain by 11.1% compared to ambient CO2. However, despite the nutritive effect, crop under elevated CO2 suffered higher yield loss (26.5%) due to higher BPH population as well as sucking rate compared to ambient CO2 (12.4%).

• 出版日期2012-11-25