Effects of different wavelengths of light on life span,fecundity,and antioxidant enzyme activity of Megalurothrips usitatus
Megalurothrips usitatus is an important pest of legume crops.Overuse of chemical pesticides has resulted in high levels of resistance and numerous issues such as pesticide residue and environmental pollution.As an important means for green,safe and efficient pest control,light control technology remained underdeveloped and underutilized.This study aimed to investigate the effects of different wavelengths of light(360,420,460,580,610,650 nm and 730 nm)on the longevity,reproductive capacity,and antioxidant enzyme activity of M.usitatus,while also elucidating adaptive mechanisms under different light environments.The results showed that,compared to full-spectrum wavelengths,male longevity was longest at the wavelength of 420 nm,while shortest at 730 nm.The other tested wavelengths had no significant effect on the lifespan of both males and females(P＞0.05).Illumination ranging from 460 nm to 730 nm wavelengths had a significant effect on the number of eggs laid by M.usitatus(P＜0.05),with all tested wavelengths except 730 nm significantly reducing egg production(P＜0.05).There were differences in the antioxidant enzyme activity of M.usitatus adults which emerged in different light environments.Illumination at 360 nm,420 nm and 460 nm wavelength significantly decreased the activity levels of PPO and SOD compared to full-spectrum wavelengths(P＜0.05).Correlation analysis showed that PPO activity was significantly positively correlated with wavelength(P＜0.05),while SOD was significantly positively correlated with CAT and PPO(P＜0.05).This study suggests that short-wavelength light is a key factor in controlling the growth,development,and physiological and biochemical aspects of M.usitatus.These results provide a theoretical basis for revealing the population dynamics of M.usitatus and the development and application of green light-controlled technology.
Megalurothrips usitatusantioxidant enzyme activitygrowth and developmentreproduction
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NSTL
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