The potassium-dependent transcriptome of Arabidopsis reveals a prominent role of jasmonic acid in nutrient signaling

被引:374
作者
Armengaud, P [1 ]
Breitling, R
Amtmann, A
机构
[1] Univ Glasgow, Inst Biomed & Life Sci, Plant Sci Grp, Glasgow G12 8QQ, Lanark, Scotland
[2] Univ Glasgow, Inst Biomed & Life Sci, Bioinformat Res Ctr, Glasgow G12 8QQ, Lanark, Scotland
基金
英国生物技术与生命科学研究理事会;
关键词
D O I
10.1104/pp.104.046482
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Full genome microarrays were used to assess transcriptional responses of Arabidopsis seedlings to changing external supply of the essential macronutrient potassium (K+). Rank product statistics and iterative group analysis were employed to identify differentially regulated genes and statistically significant coregulated sets of functionally related genes. The most prominent response was found for genes linked to the phytohormone jasmonic acid (JA). Transcript levels for the JA biosynthetic enzymes lipoxygenase, allene oxide synthase, and allene oxide cyclase were strongly increased during K+ starvation and quickly decreased after K+ resupply. A large number of well-known JA responsive genes showed the same expression profile, including genes involved in storage of amino acids (VSP), glucosinolate production (CYP79), polyamine biosynthesis (ADC2), and defense (PDF1.2). Our findings highlight a novel role of JA in nutrient signaling and stress management through a variety of physiological processes such as nutrient storage, recycling, and reallocation. Other highly significant K+-responsive genes discovered in our study encoded cell wall proteins (e.g. extensins and arabinogalactans) and ion transporters (e.g. the high-affinity K+ transporter HAK5 and the nitrate transporter NRT2.1) as well as proteins with a putative role in Ca2+ signaling (e.g. calmodulins). On the basis of our results, we propose candidate genes involved in K+ perception and signaling as well as a network of molecular processes underlying plant adaptation to K+ deficiency.
引用
收藏
页码:2556 / 2576
页数:21
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