›› 2001, Vol. 44 ›› Issue (4): 534-540.

• RESEARCH PAPERS • Previous Articles     Next Articles

The effects of high temperature on both yeast-like symbionts and amino acid requirements of Nilaparvata lugens

FU Qiang1,2, ZHANG Zhi-tao1, HU Cui2, LAI Feng-xiang1   

  • Online:2001-11-20 Published:2001-11-20

Abstract: The brown planthopper, Nilaparvata lugens, was subject to a 35℃ treatment for 72 h at the egg stage, and the development of yeast-like symbionts and amino acid requirements of both heat-treated and untreated N. lugens were studied. The results indicated that heat-treated N. lugens harbored substantially fewer symbionts at the nymphal stage as compared with untreated one. By rearing on 22 chemically defined diets, with single amino acid deleted for each diet, only the requirements of heat-treated N. lugens for 8 essential amino acids, i.e. His, Lys, Leu, Ile, Thr, Val, Phe, Try, increased obviously with the rate of adult emergence as indicator. It was proposed that the yeast-like symbionts be closely related to the requirements of above 8 essential amino acids for N. lugens.

Key words: Nilaparvata lugens, yeast-like symbiont, amino acid, high temperature