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How the Wild Sugarcane Resource Miscanthus floridulus Responds to Low-Temperature Stress: A Physiological and Transcriptomic Analysis

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Abstract

Miscanthus floridulus (Labiu.) Warb is the most cold-tolerant wild resource among the members of the Saccharum complex and has prospective applications in cold-tolerant sugarcane breeding. However, the physiological and transcriptomic basis of the cold tolerance of Miscanthus floridulus is still unclear. In this study, as part of a pot experiment, Miscanthus floridulus was subjected to low-temperature (3 °C) stress (normal temperature was used as a control), the main physiological characteristics were determined, and transcriptomic changes were analysed. Low-temperature stress significantly decreased the leaf relative water content, chlorophyll content, and cell membrane permeability of M. floridulus while increasing the proline, soluble sugar, soluble protein, and abscisic acid contents and peroxidase and superoxide dismutase activities. Analysis of differentially expressed genes (DEGs) showed that 13,298 genes were upregulated and that 7544 genes were downregulated upon low-temperature stress. These DEGs were enriched in many different metabolic pathways, in particular those involving enzymes related to plant hormone signal transduction and starch and sucrose metabolism. The activities of protein phosphatase, β-amylase and cell wall invertase increased under low-temperature stress. Our results revealed that M. floridulus might undergo extensive transcriptional reprogramming of genes involved in hormonal changes and sugar accumulation, which contributes synergistically or independently to the enhanced cold tolerance. The results of this study could provide a scientific basis for further application of M. floridulus in sugarcane cold tolerance breeding.

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Data Availability

The data supporting the conclusions of this article are provided within the paper and its additional files. All sequencing reads are deposited in the National Center for Biotechnology Information under the BioProject number PRJNA803453 with the Sequence Read Archive (SRA) study accession SRP358303.

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Acknowledgements

We thank AJE for its linguistic assistance during the preparation of this manuscript. This study was financially supported by the National Natural Science Foundation of China (No. 32160492, No. 31460372 and No. 31760417).

Funding

National Natural Science Foundation of China, Grant/Award Numbers: 32160492, 31460372 and 31760417.

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Xian-Hong Wang, Hong-Li Yang and Qing-Hui Yang designed the experiments; Hong-Li Yang performed the research, analysed the data and wrote the manuscript; Zhi-Jun Guo, Mo Chen and Qing Liu treated the experimental materials; and Lu Jiang, Jun-Jun He, Xing-Hua Yu and Xian-Hong Wang revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xian-Hong Wang or Qing-Hui Yang.

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Additional file 1: Table S1. qPCR components and dosage (DOCX 13 kb)

12355_2022_1193_MOESM2_ESM.docx

Additional file 2: Table S2. Primers used in quantitative real-time RT-qPCR validation of gene expression data as revealed by RNAseq analysis (DOCX 72 kb)

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Yang, HL., Guo, ZJ., Jiang, L. et al. How the Wild Sugarcane Resource Miscanthus floridulus Responds to Low-Temperature Stress: A Physiological and Transcriptomic Analysis. Sugar Tech 25, 398–409 (2023). https://doi.org/10.1007/s12355-022-01193-5

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  • DOI: https://doi.org/10.1007/s12355-022-01193-5

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