Physiological and Population Responses of Nilaparvata lugens after Feeding on Drought-Stressed Rice
2022
Xinyan Liang | Lin Chen | Xiaoying Lan | Guangrong Liao | Ling Feng | Jitong Li | Wenyan Fan | Shuang Wang | Jinglan Liu
Drought stress greatly impacts insect development and population growth. Some studies have demonstrated increased reproductive capacity in drought-stressed insects: however, physiological changes in the brown planthopper (BPH), Nilaparvata lugens (Stå:l), during periods of drought are unclear. In this study, BPH fed on drought- stressed rice had lower population numbers than BPH feeding on non-stressed rice. Water content, osmotic pressure of hemolymph and total amino acid content of BPH were significantly lower when BPH fed on drought-stressed rice compared to the non-stressed control: however, glucose content and glutathione S-transferase (GST) activity were significantly higher in BPH fed on drought-stressed rice. The expression of Vitellogenin and Exuperantia in BPH fed on drought-stressed rice was higher than that in BPH feeding on non-stressed control plants. The size of myofibrils and the abundance of mitochondria in BPH flight muscles were significantly lower in BPH fed on drought-stressed rice compared to non-stressed plants. These results indicate that water management impacts the physiology of BPH, which may be useful in understanding the relationship between drought stress and this damaging herbivore.
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