ABSTRACT Waterlogging frequently occurs in Canna cultivation due to excessive soil moisture, leading to oxygen deficiency in the root zone and impaired plant growth. However, the mechanisms underlying waterlogging tolerance in Canna remain poorly understood. In this study, morphological and physiological responses to waterlogging stress were compared between two cultivars: the waterlogging‐tolerant ‘Mohong (MH)’ and the waterlogging‐sensitive ‘Qianbeijiaoyu (QBJY)’. Transcriptomic analysis via RNA sequencing was also conducted to elucidate the molecular basis of waterlogging adaptation. Under waterlogging stress, ‘MH’ developed more adventitious roots and aerenchyma, sustained less root damage, and exhibited stronger antioxidant enzyme activity, thereby reducing ROS accumulation and cellular injury. Additionally, ‘MH’ showed higher activities of key enzymes involved in both aerobic and anaerobic respiration, supporting stable energy production during stress. Transcriptome profiling revealed more pronounced DEGs in ‘MH’, including upregulation of genes related to fermentation (e.g., PDC, ADH), antioxidant defence (e.g., SOD, POD, CAT), and photosynthetic carbon assimilation. These responses contributed to a sustained energy supply and enhanced waterlogging tolerance in ‘MH’. This study provides insights into waterlogging tolerance mechanisms in Canna and offers practical guidance for selecting resistant varieties in wetland landscaping and edible Canna cultivation.
Song et al. (Thu,) studied this question.
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