Unveiling the multifunctional roles of karrikin as a novel phytohormone in cadmium detoxification of bread wheat (Triticum aestivum L.)

文献类型： 外文期刊

第一作者： Zhou, Ting

作者： Zhou, Ting;Xiao, Yu-shan;Fu, Yong-le;Cui, Rui;Feng, Ying-na;Hua, Ying-peng;Li, Hao;Zhou, Zheng-fu

作者机构：

关键词： Bread wheat; Cadmium mitigation; Gene expression; Ion and hormone homeostasis; Karrikin

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 496 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd) contamination in bread wheat threatens global food security and crop sustainability. Karrikin (KAR), a newly identified phytohormone exhibiting established growth-promoting effects in crops, has not yet been mechanistically defined in Cd detoxification pathways. This study revealed that additional nanomolar KAR mitigated Cd toxicity through dual mechanisms: inhibiting Cd uptake and enhancing stress resilience. Exogenous KAR application increased shoot and root biomass by 44.5 % and 34.7 %, respectively, under Cd toxicity while reducing tissue Cd concentrations by 39.1 %-41.5 % without disturbing essential micronutrient homeostasis. Integrative physiological and transcriptomic analyses demonstrated that KAR suppressed critical metal transporters (COPT3, ATX1 among others), restricting Cd influx. KAR preserved photosynthetic efficiency by maintaining chlorophyll content and stabilizing photosystem proteins. Mechanistically, KAR balanced redox homeostasis through dual ROS modulation-decreasing root H2O2 production by 26.0 % while elevating antioxidant enzyme (SOD, APX) activities in both roots and shoots. KAR modulated phytohormonal crosstalk by antagonizing jasmonic acid and brassinosteroid biosynthesis while paradoxically activating their downstream regulators, suggesting compensatory signaling rewiring. Promoter motif enrichment analysis identified MYB, MYC and G-box transcription factors as central regulators governing KAR-mediated Cd detoxification networks. These findings establish the novel role of nanomolar KAR in concurrently reducing Cd accumulation and improving stress resilience of bread wheat, proposing an eco-friendly phytomanagement strategy for heavy metal-contaminated agrosystems.

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