Sengottayan Senthil-Nathan

Scientific Report; 2021 Apr 26;11(1):8905.  doi: 10.1038/s41598-021-87992-4.

Abstract

The elevated CO₂ (eCO₂) has positive response on plant growth and negative response on insect pests. As a contemplation, the feeding pattern of the brown plant hopper, Nilaparvata lugens Stål on susceptible and resistant rice cultivars and their growth rates exposed to eCO₂ conditions were analyzed. The eCO₂ treatment showed significant differences in percentage of emergence and rice biomass that were consistent across the rice cultivars, when compared to the ambient conditions. Similarly, increase in carbon and decrese in nitrogen ratio of leaves and alterations in defensive peroxidase enzyme levels were observed, but was non-linear among the cultivars tested. Lower survivorship and nutritional indices of N. lugens were observed in conditions of eCO₂ levels over ambient conditions. Results were nonlinear in manner. We conclude that the plant carbon accumulation increased due to eCO₂, causing physiological changes that decreased nitrogen content. Similarly, eCO₂ increased insect feeding, and did alter other variables such as their biology or reproduction.

See: https://pubmed.ncbi.nlm.nih.gov/33903626/

Figure 6: Survival rate of N. lugens on rice varieties (A-IR 20; B- ADT 46) grown in ambient and eCO₂ condition. Survivorship curves differ at the α = 0.05 confidence interval according to log-rank statistics.