Gender Influenced Spore Dimorphism in Nosema bombycis Nageli Causing Pebrine Disease in Mulberry Silkworm, Bombyx mori L.

Walailak Journal of Science and Technology

Buddhadeb MANNA¹  Atul SAHA²  Bharat Bhusan BINDROO²  Satadal CHAKRABARTY² 

[1] Parasitology Research Unit, Department of Zoology, The University of Calcutta, Ballygunge Circular Road, Kolkata 700019;Silkworm Pathology Laboratory, Central Sericultural Research & Training Institute Central Silk Board, West Bengal;

关键词: Nosema bombycis;    polar filament;    primary spore;    environmental spore;    gender specificity;   

DOI  :  10.2004/wjst.v10i2.303

来源: DOAJ

【 摘 要 】

Nosema bombycis is a pathogen causing pebrine disease of the mulberry silkworm, Bombyx mori. The disease spreads mainly through transovarian transmission of environmental spore and secondarily through contaminated food, rearing appliances, etc. by primary spores. Ultra-structure studies using Scanning and Transmission Electron Microscopy of the two spores revealed differences in the primary spore which contained a Short Polar Tube (ST) with a thin wall (< 200 nm), and the environmental spore which contained a Long Polar Tube (LT) with a thick wall (> 200 nm). It is observed that the yield of spore with LT is highest in female moths, whereas, it is spores with ST are highest in male moths. Besides ultra-structures, the development pattern of the two types of spores is also different. It is an interesting finding in the present study that, spores of N. bombycis produced two types of spores and multiplied in different gender under the influence of the host’s reproductive role and physiology for transmission of disease. The detailed study on ultra-structure of disporous N. bombycis in both the sexes of B. mori along with their development in the life cycle stages of silkworms with special reference to the inoculum concentration of spore is discussed.

【 授权许可】

Unknown