Comparative transcriptome analysis reveals gene expression differences between two peach cultivars under saline-alkaline stress
文献类型： 外文期刊
作者： Sun, Shuxia 1 ; Song, Haiyan 2 ; Li, Jing 2 ; Chen, Dong 2 ; Tu, Meiyan 1 ; Jiang, Guoliang 2 ; Yu, Guoqing 3 ; Zhou, Zhi 1 ;
作者机构： 1.Southwest Univ, Coll Hort & Landscape Architecture, Chongqing 400716, Peoples R China
2.Sichuan Acad Agr Sci, Hort Res Inst, Chengdu 610066, Sichuan, Peoples R China
3.Fruit Technol Promot Stn Longquanyi Dist, Chengdu 610100, Sichuan, Peoples R China
关键词： Peach; Saline-alkaline stress; Transmission electron microscopy observation; Comparative transcriptome analysis; Transcription factor
期刊名称：HEREDITAS （ 影响因子：3.271； 五年影响因子：2.807 ）
ISSN： 1601-5223
年卷期： 2020 年 157 卷 1 期
页码：
收录情况： SCI
摘要： Background Saline-alkaline stress is a major abiotic stress that is harmful to plant growth worldwide. Two peach cultivars (GF677 and Maotao) display distinct phenotypes under saline-alkaline stress. The molecular mechanism explaining the differences between the two cultivars is still unclear. Results In the present study, we systematically analysed the changes in GF677 and Maotao leaves upon saline-alkaline stress by using cytological and biochemical technologies as well as comparative transcriptome analysis. Transmission electron microscopy (TEM) observations showed that the structure of granum was dispersive in Maotao chloroplasts. The biochemical analysis revealed that POD activity and the contents of chlorophyll a and chlorophyll b, as well as iron, were notably decreased in Maotao. Comparative transcriptome analysis detected 881 genes with differential expression (including 294 upregulated and 587 downregulated) under the criteria of |log2 Ratio| >= 1 and FDR <= 0.01. Gene ontology (GO) analysis showed that all differentially expressed genes (DEGs) were grouped into 30 groups. MapMan annotation of DEGs showed that photosynthesis, antioxidation, ion metabolism, and WRKY TF were activated in GF677, while cell wall degradation, secondary metabolism, starch degradation, MYB TF, and bHLH TF were activated in Maotao. Several iron and stress-related TFs (ppa024966m, ppa010295m, ppa0271826m, ppa002645m, ppa010846m, ppa009439m, ppa008846m, and ppa007708m) were further discussed from a functional perspective based on the phylogenetic tree integration of other species homologues. Conclusions According to the cytological and molecular differences between the two cultivars, we suggest that the integrity of chloroplast structure and the activation of photosynthesis as well as stress-related genes are crucial for saline-alkaline resistance in GF677. The results presented in this report provide a theoretical basis for cloning saline-alkaline tolerance genes and molecular breeding to improve saline-alkaline tolerance in peach.
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