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Physiological and Transcriptomic Responses of Illicium difengpi to Drought Stress

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  • Baoyu Liu

    (Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
    These authors contributed equally to this work.)

  • Huiling Liang

    (Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
    These authors contributed equally to this work.)

  • Chao Wu

    (Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China)

  • Xiyang Huang

    (Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China)

  • Xiangying Wen

    (South China Botanical Garden, Chinese Academy of Sciences, Botanic Gardens Conservation International (BGCI) China Office, 723# Xingke Road, Tianhe District, Guangzhou 510650, China)

  • Manlian Wang

    (Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China)

  • Hui Tang

    (Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China)

Abstract

Illicium difengpi Kib and Kim, an endangered plant unique to karst areas in China, has evolved an extremely high tolerance to arid environments. To elucidate the molecular mechanisms of the response to drought stress in I. difengpi , physiological index determination and transcriptome sequencing experiments were conducted in biennial seedlings grown under different soil moisture conditions (70~80%, 40~50% and 10~20%). With increasing drought stress, the leaf chlorophyll content decreased, while the proline (Pro), soluble sugar (SS) and malondialdehyde (MDA) contents increased; superoxide dismutase (SOD) and peroxidase (POD) activities also increased. Transcriptome sequencing and pairwise comparisons of the treatments revealed 2489, 4451 and 753 differentially expressed genes (DEGs) in CK70~80 vs. XP40~50, CK70~80 vs. XP10~20 and XP40~50 vs. XP10~20, respectively. These DEGs were divided into seven clusters according to their expression trends, and the Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment results of different clusters indicated that genes in the hormone signal transduction and osmotic regulation pathways were greatly activated under mild drought stress. When drought stress increased, the DEGs related to membrane system and protein modification and folding were all upregulated; simultaneously, chitin catabolism- and glycolysis/gluconeogenesis-related genes were continuously upregulated throughout drought stress, while the genes involved in photosynthesis were downregulated. Here, 244 transcription factors derived from 10 families were also identified. These results lay a foundation for further research on the adaptation of I. difengpi to arid environments in karst areas and the establishment of a core regulatory relationship in its drought resistance mechanism.

Suggested Citation

  • Baoyu Liu & Huiling Liang & Chao Wu & Xiyang Huang & Xiangying Wen & Manlian Wang & Hui Tang, 2022. "Physiological and Transcriptomic Responses of Illicium difengpi to Drought Stress," Sustainability, MDPI, vol. 14(12), pages 1-24, June.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:12:p:7479-:d:842605
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    1. Ding, Zheli & Ali, Esmat F. & Elmahdy, Ahmed M. & Ragab, Khaled E. & Seleiman, Mahmoud F. & Kheir, Ahmed M.S., 2021. "Modeling the combined impacts of deficit irrigation, rising temperature and compost application on wheat yield and water productivity," Agricultural Water Management, Elsevier, vol. 244(C).
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