Journal
JOURNAL OF THERMAL BIOLOGY
Volume 110, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2022.103353
Keywords
Spermidine; Heat stress; Bombyx mori; Nutrition indices; Antioxidant potential
Funding
- Department of Biotechnology (DBT), New Delhi, India
- [BT/PR15319/TDS/121/12/2015]
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This study found that Spermidine can enhance the thermotolerance of Bombyx mori larvae and improve their nutritional indices and antioxidant potential.
Silkworms have limited ability to regulate their body temperature upon exposure to varying atmospheric tem-peratures. Environmental changes, such as global warming, adversely affect silkworm viability. Spermidine, a polyamine, protects various organisms against heat stress. This study aimed to evaluate the effect of spermidine on the thermotolerance of Bombyx mori larvae. 5th instar Bombyx mori larvae were divided into the control and spermidine groups and reared at 28 +/- 1 degrees C and 80%-85% relative humidity. To induce heat stress, the larvae were exposed to various temperatures 32 degrees C, 36 degrees C, and 40 degrees C for 1 h on day 5 and subsequently allowed to recover at 28 +/- 1 degrees C. Growth characteristics were evaluated by examining larval viability and quantifying proteins and carbohydrates. The thermotolerance of the spermidine group was higher than that of the control group at 40 degrees C heat stress conditions. The spermidine feeding increased the protein content and reduced the carbohydrate content significantly under heat stress condition. For the first time, this study demonstrated that spermidine alleviated thermal stress by enhancing the nutritional indices and antioxidant potential of the Bombyx mori larvae. A significant increase in economic properties was observed in spermidine fed groups. Thus, foliar feeding of spermidine to B. mori larvae markedly improved silkworm thermotolerance.
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