Journal of Tea Science Research, 2024, Vol.14, No.6, 344-352 http://hortherbpublisher.com/index.php/jtsr 349 7.4 Regulatory mechanisms and application potential in response to environmental stress Hormone- and environment-mediated regulation of CsSCPL genes in tea plants is closely related to catechin biosynthesis and adaptation to the environment. CsMYB1, for instance, is pivotal as a transcription factor to regulate coordinately trichome formation and catechin production—characters subjected to selection in domestication to enhance stress tolerance and flavor. Besides, regulatory modules CsPHRs-CsJAZ3 and CsHSFA-CsJAZ6 play roles in mediating nutrient deficiency and heat stress responses, respectively, uncovering molecular mechanisms for the tea plant to maintain catechin accumulation under stress. These findings offer promising molecular targets for breeding tea cultivars that are not only catechin-enriched but also stress-resilient (Ahmad et al., 2020; Li et al., 2022a; Zhang et al., 2023) (Figure 2). Figure 2 Environmental and hormonal regulation of CsSCPL genes in tea plants. PlantCare were used to analyze the 1,500 bp upstream region of each CsSCPLI gene. (A) The percentage of light responsive elements, hormone responsive elements, environmental stress related elements, and plant growth responsive elements in all CsSCPLI family members. (B) Different hormone (ABA, ethylene, MeJA, auxin, gibberellinlic acid) responsive elements in CsSCPLI genes cis-element regions. (C) Different environmental stress (heat, cold and dehydration, drought, defense, anaerobic, wound and pathogen) related elements in CsSCPLI genes cis-element regions. (D) Different plant growth related elements in CsSCPLI genes cis-element regions. (E-J) Heatmaps displaying expression patterns of various CsSCPL1A-AT genes under various conditions. Transcriptome data from experiments with tea cv. Shuchazao were retrieved from the tea plant information archive (http://tpia.teaplant.org/index.html). The expression levels of CsSCPL1Agenes were normalized as fragments per-kilobase of exon per million fragments (FPKM) in eight tea plant tissues (root; stem; old, mature, and young leaves; apical bud; flower; and fruit) and displayed as Log10(FPKM) in heatmaps using Mev4.9.0 (https://sourceforge.net/projects/mev-tm4/) (Adopted from Ahmad et al., 2020)
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