开枪
生物
WRKY蛋白质结构域
拟南芥
转录组
生物化学
圆周率
MYB公司
磷酸酶
氮缺乏
硝酸还原酶
缺磷
信号转导
植物
营养物
化学
转录因子
酶
基因表达
基因
有机化学
氮气
突变体
生态学
作者
Zhenyi Li,Jingyun Hu,Yao Wu,Jixiang Wang,Hui Song,Maofeng Chai,Lili Cong,Fuhong Miao,Li Ma,Wei Tang,Chao Yang,Qibo Tao,Shangzhi Zhong,Yiran Zhao,Liu Hongqing,Guofeng Yang,Zengyu Wang,Juan Sun
标识
DOI:10.1016/j.plaphy.2021.11.039
摘要
Understanding the mechanisms underlying the responses to inorganic phosphate (Pi) deficiency in alfalfa will help enhance Pi acquisition efficiency and the sustainable use of phosphorous resources. Integrated global metabolomic and transcriptomic analyses of mid-vegetative alfalfa seedlings under 12-day Pi deficiency were conducted. Limited seedling growth were found, including 13.24%, 16.85% and 33.36% decreases in height, root length and photosynthesis, and a 24.10% increase in root-to-shoot ratio on day 12. A total of 322 and 448 differentially abundant metabolites and 1199 and 1061 differentially expressed genes were identified in roots and shoots. Increased (>3.68-fold) inorganic phosphate transporter 1;4 and SPX proteins levels in the roots (>2.15-fold) and shoots (>2.50-fold) were related to Pi absorption and translocation. The levels of phospholipids and Pi-binding carbohydrates and nucleosides were decreased, while those of phosphatases and pyrophosphatases in whole seedlings were induced under reduced Pi. In addition, nitrogen assimilation was affected by inhibiting high-affinity nitrate transporters (NRT2.1 and NRT3.1), and nitrate reductase. Increased delphinidin-3-glucoside might contribute to the gray-green leaves induced by Pi limitation. Stress-induced MYB, WRKY and ERF transcription factors were identified. The responses of alfalfa to Pi deficiency were summarized as local systemic signaling pathways, including root growth, stress-related responses consisting of enzymatic and nonenzymatic systems, and hormone signaling and systemic signaling pathways including Pi recycling and Pi sensing in the whole plant, as well as Pi recovery, and nitrate and metal absorption in the roots. This study provides important information on the molecular mechanism of the response to Pi deficiency in alfalfa.
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