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Physiological and transcriptomic analysis highlight key metabolic pathways in relation to drought tolerance in Rhododendron delavayi
发布:蔡艳飞   发布时间:2019-10-29   浏览次数:1238    [] [] []

Rhododendron delavayi is an alpine evergreenornamental plant, but water shortage limits its growth anddevelopment in urban gardens. However, the adaptivemechanism of alpine evergreen rhododendrons to droughtremains unclear. Here, a water control experiment wasconducted to study the physiological and transcriptomicresponse of R. delavayi to drought. The drought treatmentfor 9 days decreased photosynthetic rate, induced accumulation of reactive oxygen species (ROS), and damagedchloroplast ultrastructureof R. delavayi. However, thephotosynthetic rate quickly recovered to the level beforetreatment when the plants were re-watered. De novoassembly of RNA-Seq data generated 86,855 unigenes withan average length of 1870 bp. A total of 22,728 differentially expressed genes (DEGs) were identified between thecontrol and drought plants. The expression of most DEGsrelated to photosynthesis were down-regulated duringdrought stress, and were up-regulated when the plants were re-watered, including the DEGs encoding subunitsof lightharvesting 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.

Fig.1:KEGG map of photosynthesis-antenna proteins (A) and photosynthetic pathway (B) for Rhododendron delavayi. Analysis of DEGs indrought-treated samples compared to untreated control. The boxes with red square indicate that corresponding DEGs are downregulated in drought-treated samples, and the boxes without red square indicate that the expression level of the corresponding genes are not changed, as determined by RNA-seq.

Fig. 2: Heatmap of enriched DEGs in flavonoid biosynthesis (A) and detoxification enzymes (B)

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