CELLULAR-CHANGES OF THE YEAST-LIKE ENDOCYTOBIONT IN THE BROWN PLANTHOPPER, NILAPARVATA-LUGENS (STAL), AFTER HIGH-TEMPERATURE TREATMENT

Cellular changes of the endocytobiont, i.e., the yeast-like symbiote ( YLS), in the brown planthopper, Nilaparvata lugens (Stal), after treat ing with high temperatures at 32 degrees C or 35 degrees C, were studi ed by using electron microscopy. Scanning electron micrographs showed distortion of the endocytobiont cell wall, forming abnormal shape afte r incubating at high temperatures. The major cellular changes in YLS u nder high temperatures were found to be disintegration of cell wall, d egeneration of nucleus, and loss of cytoplasm as observed by transmiss ion electron microscopy.