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Summary
Temperature is one of the key environmental factors in Litopenaeus vannamei (Boone, 1931) culture, affecting the growth and survival of shrimp. Our previous study found that stress resistance related pathways (endoplasmic reticulum stress, immune, and apoptosis) were significantly increased under low temperature stress, but studies about their regulation are still limited. Therefore, the histological changes and the genes expression related to the above pathways in L. vannamei were examined under conditions of cooling from 28 to 13 degrees C with a cooling rate of 2.5 degrees C /2 h and then maintained at 13 degrees C for 12 h. The results showed that the gill and intestine of L. vannamei were obviously damaged after low temperatures stress, while the muscle tissue of shrimp did not change significantly. Most of the relative expression of unfolded protein response (UPR) pathway (GRP78, ATF6, IRE1, and PERK), immune (proPO), as well as apoptosis (CASP3) gene in each tissue were significant changed after cooling. The results suggested that muscle may be more structurally stable than other tissues in shrimp. The stress resistance mechanisms could be activated under low temperatures, and 18 degrees C may be the critical point for L. vannamei to adjust its anti-stress system to maintain organism homeostasis. Moreover, the results also reflect that the stress resistance system is tissue-specific under low temperature stress in L. vannamei. This study can enrich our understanding of the responses at the histological and genetic levels in shrimp under low temperature stress, helping to promote further development of shrimp culture industry.
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Institution广东省农业科学院; 贵州大学; 华南农业大学
