Abstract
In plants, stress-associated proteins (SAP) play a crucial role in responding to adverse biotic and abiotic factors. In this study, we evaluated the expression profiles of 14 apple SAP genes (MdSAP) under the influence of low and high temperatures, as well as salinity, using the quantitative polymerase chain reaction (qPCR). The results showed that the most significant changes in expression levels were observed in the genes MdSAP11, MdSAP2, and MdSAP3 under high temperature conditions, MdSAP1, MdSAP2, MdSAP4, and MdSAP6 under low temperature conditions, and MdSAP1, MdSAP8, and MdSAP11 under salt stress. Furthermore, there was a tendency for gene expression to increase at 2 and/or 4 hours of exposure followed by a decrease at 24 hours. The analysis of the correlation between the expression levels of MdSAP genes revealed both positive and negative linear relationships.These findings will help elucidate the specific roles of individual SAP genes in shaping the apple stress response to low and high temperatures, as well as salinity.
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