ArticleBMC plant biology2024
Comparative transcriptomic and physiological analyses reveal the key role of abscisic acid in hydrangea macrophylla responding to Corynespora cassiicola.
Article in BMC plant biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Integrated Transcriptomic Profiling Reveals Distinct and Overlapping Transcriptional Responses and Regulatory Pathways Mediated by Salicylic Acid, Jasmonic Acid, and Abscisic Acid in Lotus (International journal of molecular sciences · 2026Article
- Genome-wide AP2/ERF analysis identifies HmaERF87 as a positive regulator of Hydrangea macrophylla leaf spot resistance.Plant cell reports · 2026Article
- A VIGS-based leaf disc method reveals ethylene's crucial role in hydrangea leaf spot resistance.Plant cell reports · 2025Article
- Integrative analysis of transcriptome and metabolome reveal molecular mechanism of tolerance to salt stress in rice.BMC plant biology · 2025Article
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10 authors.
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Abstract
backgroundBigleaf hydrangea (Hydrangea macrophylla) is a widely cultivated ornamental plant species. Leaf spot disease, caused by Corynespora cassiicola, poses a significant threat to the ornamental quality and economic value of hydrangeas. However, the disease resistance breeding of hydrangea is limited due to the lacking of resistant varieties and genes.
resultsThis study evaluated ten hydrangea varieties for their resistance to leaf spot disease. Among them, 'White Angel' and 'Ocean Heart' were screened out as representative varieties for resistance and susceptibility, respectively, on the basis of evaluation. Physiological and biochemical indices, phytohormones, and transcriptomic changes were measured in the leaves of both varieties at 0 and 24 h post inoculation with C. cassiicola. The results showed that C. cassiicola infection significantly increased abscisic acid (ABA) contents in both varieties; however, the increase was significantly higher in the susceptible variety 'Ocean Heart' compared to the resistant variety 'White Angel' (p < 0.05). Moreover, exogenous ABA (100 µM) decreased the leaves' resistance to C. cassiicola of both varieties, underscoring its key role in reduced disease resistance. Transcriptome profiling revealed 17,087 differentially expressed genes (DEGs) responding to C. cassiicola between the two varieties. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis indicated significant enrichment of DEGs in "Plant hormone signal transduction", particularly related to ABA signaling (HmPP2C and HmABFs). In addition, the expression of ABA biosynthesis genes (HmZEP3, HmABA2, and HmAAO3) was upregulated in both varieties. Meanwhile, the ABA catabolism gene (HmCYP707A4) exhibited significantly upregulated expression in the resistant variety 'White Angel' and downregulated expression in the susceptible variety 'Ocean Heart'. Intriguingly, the expression of HmCYP707A4 was 15-fold higher in 'White Angel' than in 'Ocean Heart'.
conclusionIn summary, these findings highlight the crucial role of ABA in the resistance of bigleaf hydrangea to leaf spot disease and provide valuable genetic resources for breeding programs to enhance the disease resistance in hydrangeas.
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