Root-shoot interactions explain the reduction of leaf mineral content in Arabidopsis plants grown under elevated [CO2] conditions

Jauregui, Ivan and Aparicio-Tejo, Pedro M. and Avila, Concepción and Cañas, Rafael and Sakalauskiene, Sandra and Aranjuelo, Iker (2016) Root-shoot interactions explain the reduction of leaf mineral content in Arabidopsis plants grown under elevated [CO2] conditions. Physiologia Plantarum, 158 (1). pp. 65-79. ISSN 0031-9317

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Abstract

Although shoot N depletion in plants exposed to elevated [CO2] has already been reported on several occasions, some uncertainty remains about the mechanisms involved. This study illustrates (1) the importance of characterizing root-shoot interactions and (2) the physiological, biochemical and gene expression mechanisms adopted by nitrate-fed Arabidopsis thaliana plants grown under elevated [CO2]. Elevated [CO2] increases biomass and photosynthetic rates; nevertheless, the decline in total soluble protein, Rubisco and leaf N concentrations revealed a general decrease in leaf N availability. A transcriptomic approach (conducted at the root and shoot level) revealed that exposure to 800ppm [CO2] induced the expression of genes involved in the transport of nitrate and mineral elements. Leaf N and mineral status revealed that N assimilation into proteins was constrained under elevated [CO2]. Moreover, this study also highlights how elevated [CO2] induced the reorganization of nitrate assimilation between tissues; root nitrogen assimilation was favored over leaf assimilation to offset the decline in nitrogen metabolism in the leaves of plants exposed to elevated [CO2].

Item Type:
Journal Article
Journal or Publication Title:
Physiologia Plantarum
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1307
Subjects:
ID Code:
81381
Deposited By:
Deposited On:
30 Aug 2016 12:52
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Mar 2020 05:40