Cotton Genomics and Genetics 2025, Vol.16, No.1, 39-47 http://cropscipublisher.com/index.php/cgg 43 Figure 2 Models depicting the molecular basis of heat and cold tolerance in TM-1 (Adopted from Hu et al., 2019) Image caption: a,d, Phenotypic comparison of TM-1 and Hai7124 cotton seedlings in response to heat (a) and cold (d) stress. Photographs were taken under normal conditions or for seedlings subjected to heat treatment at 37 °C or cold treatment at 4 °C for 120 h followed by recovery for 24 h. Scale bars, 10 cm. b,e, Heat maps showing differentially expressed genes involved in the ethylene signaling pathway for heat stress (b) and the ABA signaling pathway for cold stress (e) in TM-1 and Hai7124. Red, upregulation; yellow, downregulation; blue, no difference in expression; white, absence of an orthologous gene. c, A proposed model showing that the ethylene and plasma membrane signaling pathways cooperatively enhance heat tolerance in G. hirsutum. These pathways work together to maintain high transcriptional activities under heat stress, whereas no difference in expression is observed in G. barbadense. f, Diagram of the cold-responsive transcriptional network in cotton. The ABA and calcium signaling pathways were activated in G. hirsutum, whereas only a small portion of the differentially expressed genes were activated in G. barbadense. Upward- and downward-pointing arrows indicate up- and downregulated genes; red and blue numbers correspond to the number of differently expressed genes in TM-1 and Hai7124, respectively (Adopted from Hu et al., 2019)
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