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Physiological and transcriptomic analysis highlight key metabolic pathways in relation to drought tolerance in Rhododendron delavayi

文献类型： 外文期刊

作者： Cai, Yan-Fei 1 ; Wang, Ji-Hua 1 ; Zhang, Lu 1 ; Song, Jie 1 ; Peng, Lv-Chun 1 ; Zhang, Shi-Bao 3 ;

作者机构： 1.Yunnan Acad Agr Sci, Flower Res Inst, Kunming 650205, Yunnan, Peoples R China

2.Natl Engn Res Ctr Ornamental Hort, Kunming 650205, Yunnan, Peoples R China

3.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China

关键词： Drought; Photosynthesis; Photoprotection; Transcriptome; Rhododendron delavayi

期刊名称：PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS （ 影响因子：2.391； 五年影响因子：2.836 ）

ISSN： 0971-5894

年卷期： 2019 年 25 卷 4 期

页码：

收录情况： SCI

摘要： Rhododendron delavayi is an alpine evergreen ornamental plant, but water shortage limits its growth and development in urban gardens. However, the adaptive mechanism of alpine evergreen rhododendrons to drought remains unclear. Here, a water control experiment was conducted to study the physiological and transcriptomic response of R. delavayi to drought. The drought treatment for 9days decreased photosynthetic rate, induced accumulation of reactive oxygen species (ROS), and damaged chloroplast ultrastructure of R. delavayi. However, the photosynthetic rate quickly recovered to the level before treatment when the plants were re-watered. De novo assembly of RNA-Seq data generated 86,855 unigenes with an average length of 1870bp. A total of 22,728 differentially expressed genes (DEGs) were identified between the control and drought plants. The expression of most DEGs related to photosynthesis were down-regulated during drought stress, and were up-regulated when the plants were re-watered, including the DEGs encoding subunits of light-harvesting chlorophyll-protein complex, photosystem II and photosystem I reaction center pigment-protein complexes, and photosynthetic electron transport. The expressions of many DEGs related to signal transduction, flavonoid biosynthesis and antioxidant activity were also significantly affected by drought stress. The results indicated that the response of R. delavayi to drought involved multiple physiological processes and metabolic pathways. Photosynthetic adjustment, ROS-scavenging system, abscisic acid and brassinosteroid signal transduction pathway may play important roles to improve drought tolerance of R. delavayi. Our findings provided valuable information for understanding the mechanisms of drought tolerance employed by Rhododendron species.

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