Journal
PLANT JOURNAL
Volume 113, Issue 2, Pages 225-245Publisher
WILEY
DOI: 10.1111/tpj.16042
Keywords
alkaline-salinity; GWAS; Arabidopsis; natural variation; ionome
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By evaluating the growth condition variation of 270 natural accessions of Arabidopsis thaliana on a natural saline-carbonated soil, significant natural variation in leaf sodium and iron concentrations was discovered. The diversity in leaf sodium concentration was associated with allelic variation in the NINJA and YUC8 genes, while leaf iron concentration diversity was associated with allelic variation in the ALA3 gene. The allelic variation in these genes leads to changes in mRNA expression and correlates with plant differential growth performance under alkaline salinity treatment.
In nature, multiple stress factors occur simultaneously. The screening of natural diversity panels and subsequent Genome-Wide Association Studies (GWAS) is a powerful approach to identify genetic components of various stress responses. Here, the nutritional status variation of a set of 270 natural accessions of Arabidopsis thaliana grown on a natural saline-carbonated soil is evaluated. We report significant natural variation on leaf Na (LNa) and Fe (LFe) concentrations in the studied accessions. Allelic variation in the NINJA and YUC8 genes is associated with LNa diversity, and variation in the ALA3 is associated with LFe diversity. The allelic variation detected in these three genes leads to changes in their mRNA expression and correlates with plant differential growth performance when plants are exposed to alkaline salinity treatment under hydroponic conditions. We propose that YUC8 and NINJA expression patters regulate auxin and jasmonic signaling pathways affecting plant tolerance to alkaline salinity. Finally, we describe an impairment in growth and leaf Fe acquisition associated with differences in root expression of ALA3, encoding a phospholipid translocase active in plasma membrane and the trans Golgi network which directly interacts with proteins essential for the trafficking of PIN auxin transporters, reinforcing the role of phytohormonal processes in regulating ion homeostasis under alkaline salinity.
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