Loading…

Integrative analysis of the metabolome and transcriptome reveal the phosphate deficiency response pathways of alfalfa

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...

Full description

Saved in:
Bibliographic Details
Published in:Plant physiology and biochemistry 2022-01, Vol.170, p.49-63
Main Authors: Li, Zhenyi, Hu, Jingyun, Wu, Yao, Wang, Jixiang, Song, Hui, Chai, Maofeng, Cong, Lili, Miao, Fuhong, Ma, Lichao, Tang, Wei, Yang, Chao, Tao, Qibo, Zhong, Shangzhi, Zhao, Yiran, Liu, Hongqing, Yang, Guofeng, Wang, Zengyu, Sun, Juan
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. •The changed metabolites including phospholipid, flavonoids, alkaloids and GSH were identified under Pi deficiency.•The changed transcripts involved in Pi transport, Pi signaling and sensing, hormone signaling and stress-response as well as nitrogen assimilation were identified under Pi deficiency.•The local and systemic signaling pathways activated by severe phosphorus deficiency in alfalfa were summarized.
ISSN:0981-9428
1873-2690
DOI:10.1016/j.plaphy.2021.11.039