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| 1 | Comprehensive analyses of the proteome and ubiquitome revealed mechanism of high temperature accelerating petal abscission in tree peony显示文摘Tree peony(Paeonia suffruticosa Andrews)is a well-known ornamental plant with high economic value,but the short fluorescence is a key obstacle to its ornamental value and industry development.High temperature accelerates flower senescence and abscission,but the associated mechanisms are poorly understood.In this study,the tandem mass tag(TMT)proteome and label-free quantitative ubiquitome from tree peony cut flowers treated with 20℃for 0 h(RT0),20℃or 28℃for 60 h(RT60 or HT60)were examined based on morphological observation,respectively.Totally,6970 proteins and 1545 lysine ubiquitinated(Kub)sites in 844 proteins were identified.Hydrophilic residues(such as glutamate and aspartate)neighboring the Kub sites were in preference,and 36.01%of the Kub sites were located on the protein surface.The differentially expressed proteins(DEPs)and Kub-DEPs in HT60 vs RT60 were mainly enriched in ribosomal protein,protein biosynthesis,secondary metabolites biosynthesis,flavonoid metabolism,carbohydrate catabolism,and auxin biosynthesis and signaling revealed by GO and KEGG analysis,accompanying the increase of endogenous abscisic acid(ABA)accumulation and decrease of endogenous indoleacetic acid(IAA)level.Additionally,the expression patterns of six enzymes(SAMS,ACO,YUC,CHS,ANS and PFK)putatively with Kub modifications were analyzed by proteome and real-time quantitative RT-PCR.The cell-free degradation assays showed PsSAMS and PsACO proteins could be degraded via the 26 S proteasome system in tree peony flowers.Finally,a working model was proposed for the acceleration of flower senescence and abscission by high temperature.In summary,all results contributed to understanding the mechanism of flower senescence induced by high temperature and prolonging fluorescence in tree peony. | Chunying Liu Ziqi Liu Yanchao Yuan Yuxi Zhang Yifu Fang Junqiang Chen Shupeng Gai | 2024 | Horticultural Plant Journal2024，10，1： | 0 |
| 2 | 干旱胁迫下大蒜幼苗的代谢组学分析显示文摘利用高效液相色谱串联质谱广泛靶向代谢组学的方法,通过主成分分析、正交偏最小二乘判别分析、聚类分析、富集分析、相关性分析等方法,测定并比较干旱胁迫和对照大蒜幼苗叶片的代谢物质成分。结果共检测出23类743种代谢物,其中313种上调,430种下调,差异代谢物134种,占总体代谢物的18.03%。上、下调差异代谢物质数量最多的为黄酮、苯丙素、黄酮醇、黄酮类、核苷酸及衍生物、氨基酸及衍生物、糖类、有机酸及衍生物等8类物质,主要富集在黄酮和黄烷酮的生物合成途径中,干旱胁迫后大蒜幼苗叶片黄酮差异代谢物数量较多且上调。对大蒜黄酮代谢途径进行分析,咖啡酸和麦黄酮O–丙二酰己糖苷的上调关联代谢物质最多,推测干旱胁迫下黄酮和苯丙素物质含量的增加会显著提高大蒜的抗旱性。 | 田洁 周倩怡 铁原毓 孙海宏 黄思杰 | 2024 | 园艺学报2024，51，1： | 0 |
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