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Elemental Concentrations in the Seed of Mutants and Natural Variants of Arabidopsis thaliana Grown under Varying Soil Conditions

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [2];  [4];  [3];  [5];  [6];  [7];  [8];  [2];  [4];  [3]
  1. University of Nevada, Reno, NV (United States); Univ. of Nevada, Reno, NV (United States)
  2. University of California, San Diego, CA (United States)
  3. University of Nevada, Reno, NV (United States)
  4. Dartmouth College, Hanover, NH (United States)
  5. University of North Texas, Denton, TX (United States)
  6. US Dept. of Agriculture (USDA), St. Louis, MO (United States). Agricultural Research Service (ARS)
  7. University of Aberdeen (United Kingdom)
  8. University of Minnesota, St. Paul, MN (United States)
The concentrations of mineral nutrients in seeds are critical to both the life cycle of plants as well as human nutrition. These concentrations are strongly influenced by soil conditions, as shown here by quantifying the concentration of 14 elements in seeds from Arabidopsis thaliana plants grown under four different soil conditions: standard, or modified with NaCl, heavy metals, or alkali. Each of the modified soils resulted in a unique change to the seed ionome (the mineral nutrient content of the seeds). To help identify the genetic networks regulating the seed ionome, changes in elemental concentrations were evaluated using mutants corresponding to 760 genes as well as 10 naturally occurring accessions. The frequency of ionomic phenotypes supports an estimate that as much as 11% of the A. thaliana genome encodes proteins of functional relevance to ion homeostasis in seeds. A subset of mutants were analyzed with two independent alleles, providing five examples of genes important for regulation of the seed ionome: SOS2, ABH1, CCC, At3g14280 and CNGC2. In a comparison of nine different accessions to a Col-0 reference, eight accessions were observed to have reproducible differences in elemental concentrations, seven of which were dependent on specific soil conditions. These results indicate that the A. thaliana seed ionome is distinct from the vegetative ionome, and that elemental analysis is a sensitive approach to identify genes controlling ion homeostasis, including those that regulate gene expression, phospho-regulation, and ion transport.
Research Organization:
Scripps Research Institute, San Diego, CA (United States); University of California, San Diego, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
FG02-03ER15449; FG03-94ER20152
OSTI ID:
1904684
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 5 Vol. 8; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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