Abstract
Drought, one of the crucial environmental constraints, seriously threats the quality and yield in chieh-qua. Therefore, cultivating drought-tolerant variety is greatly necessary for its normal growth under water deficiency. However, at present, molecular knowledge on drought resistance is mostly unclear in chieh-qua. In the study, characteristics of two diverse genetic chieh-qua variety, A39 (drought-resistance) and H5 (drought-sensitivity), were analyzed. Under drought stress, H5 exerted high water loss rate, increased malonaldehyde (MDA) content, and decreased enzyme activity of glutathione peroxidase (GSH-PX) and superoxide dismutase (SOD) compared with A39. In addition, based on the transcriptome results, we obtained a total of 1821 (511 up-regulated and 1310 down-regulated) and 2114 (1282 up-regulated and 832 down- regulated) differentially expressed genes (DEGs) in the A39 versus H5 under normal and water-deficiency stress, respectively. Several DEGs involved in the cuticle synthesis (cytochrome P450 genes: CYP94A2, CYP86B1, CYP86A7), carbohydrate metabolism, and plant hormone signal transduction (small auxin-up RNA genes: SAUR32, SAUR72; JA-induced genes: TIFY 10A, TIFY 10C; ABA related genes: PYL2, PYL4) were explored and related to drought resistance. These expression patterns observed in the RNA-seq data were further confirmed with quantitative real-time PCR (qRT-PCR). In all, these results not only provided a new insight into analyzing genes of drought response, but also laid a foundation for isolating crucial genes involved in drought stress in chieh-qua.
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Acknowledgements
This work was supported by the Natural Science Foundation of Guangdong Province (2018A030310196), the Guangdong Special Project Youth Top-notch Talent Project (2016TQ03N529), the Natural Science Foundation of Guangdong Province (2018A030313495), the Science and Technology Program of Guangdong (2018B020202007), and the National Key Research and Development Programme (2018YFD0100700). We were appreciated for Dr. Jin Ma from the National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA for her critical reading and polishing of the manuscript.
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Wang, M., He, X., Jiang, B. et al. Transcriptome analysis in different chieh-qua cultivars provides new insights into drought-stress response. Plant Biotechnol Rep 13, 663–675 (2019). https://doi.org/10.1007/s11816-019-00564-x
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DOI: https://doi.org/10.1007/s11816-019-00564-x