Computational Molecular Biology 2025, Vol.15, No.1, 38-52 http://bioscipublisher.com/index.php/cmb 45 is worth mentioning that these pathways have never worked alone. DREB2A and HsfA3 act like a relay, one activating the other, and ultimately jointly enhancing the plant's heat tolerance. Although high temperatures may delay seed germination by a few days, at least they can preserve life. This is the wisdom of plants in responding to environmental stress. 5.3 Cold stress and the role of CBF/DREB networks Rapeseed is not passively exposed to low temperatures; it has a complete "cold-resistant system". These transcription factors such as CBF/DREB are like cold resistance commanders (Agarwal et al., 2006), specifically recognizing the DRE/CRT elements on the promoters of cold stress genes. Interestingly, this system is more pronounced in transgenic plants (Ito et al., 2006)-overexpression of these factors causes the plants to frantically accumulate proline and sugar, just like putting on a "cold-proof suit" for themselves. Even more astonishingly, from Arabidopsis thaliana to rapeseed, the strategies used by different plants are almost the same (Lata and Prasad, 2011), indicating that this is a universal overwintering wisdom in the plant kingdom. However, this system is not omnipotent. It will still fail in extremely low temperatures, but it can basically handle daily frosts. 6 Rapeseed Response to Biotic Stresses 6.1 Pathogen recognition and signal transduction The defense system of rape against pathogens is quite ingenious, as if it were equipped with multiple alarms. Transcription factors like BnaGRF are particularly interesting (Sun et al., 2022)-they do not show up in normal times, but immediately adjust their expression and activate the defense program once pathogen invasion such as scltinomycosis is detected. Even more astonishingly, the nsLTPs protein (Xue et al., 2022), named "non-specific", shows high specificity when resisting fungi such as sclerotinia and Leptospirosis spotted. In fact, the immune system of rape is much more complex than imagined. Different pathogens will activate completely different signaling pathways when they attack. Some are responsible for early warning, while others are specifically responsible for subsequent defense. This flexible and versatile strategy enables rapeseed to effectively resist the threats of various pathogens without consuming excessive energy. 6.2 Transcriptional regulation of disease resistance genes The immune system of rapeseed is like a precise regulatory network, where various signal molecules and transcription factors interact in a complex way. The transcription factors of the GARP family are versatile (Hua et al., 2022), not only involved in growth and development, but also mobilizing defense genes when pathogens invade. Interestingly, the salicylic acid (SA) and jasmonic acid (JA) signaling pathways have a subtle relationship (Caarls et al., 2015)-SA often regulates the expression of JA-related genes, just like two departments of the immune system that both divide the labor and cooperate. This cross-regulation enables rapeseed to flexibly adjust its defense strategies according to different pathogens. The most remarkable part is that this system can automatically balance defense and growth. It neither wastes energy on excessive defense nor focuses solely on growth while neglecting protection, demonstrating the survival wisdom that plants have evolved over a long period of time. 6.3 Role of salicylic acid and jasmonic acid pathways The immune defense system of rapeseed is like two well-coordinated combat troops-the SA and JA signaling pathways each have their own specialties. The SA pathway excels in protracted battles (Beckers and Spoel, 2006), especially against pathogens that rely on living organisms. It dispatches NPR1, this "messenger", to contact TGA transcription factors and rapidly activate the production line of disease-resistant proteins. The JA pathway excels in emergency response and is specifically designed to deal with highly destructive necrotic pathogens and pests, rapidly activating defense genes through the COI1 protein. Interestingly, these two channels will also "snatch channels" from each other (Liu et al., 2021)-SA often hides or directly degrades the transcription factors of JA. The seemingly contradictory regulation is actually very smart. It not only avoids the waste of defense resources but also flexibly adjusts strategies according to different threats, enabling rapeseed to deal with various biological stresses calmly.
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