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The Genome of Microthlaspi erraticum (Brassicaceae) Provides Insights Into the Adaptation to Highly Calcareous Soils
Ist Teil von
Frontiers in plant science, 2020-07, Vol.11, p.943-943
Ort / Verlag
Frontiers Media S.A
Erscheinungsjahr
2020
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Microthlaspi erraticum
is widely distributed in temperate Eurasia, but restricted to Ca
2+
-rich habitats, predominantly on white Jurassic limestone, which is made up by calcium carbonate, with little other minerals. Thus, naturally occurring
Microthlaspi erraticum
individuals are confronted with a high concentration of Ca
2+
ions while Mg
2+
ion concentration is relatively low. As there is a competitive uptake between these two ions, adaptation to the soil condition can be expected. In this study, it was the aim to explore the genomic consequences of this adaptation by sequencing and analysing the genome of
Microthlaspi erraticum
. Its genome size is comparable with other diploid Brassicaceae, while more genes were predicted. Two Mg
2+
transporters known to be expressed in roots were duplicated and one showed a significant degree of positive selection. It is speculated that this evolved due to the pressure to take up Mg
2+
ions efficiently in the presence of an overwhelming amount of Ca
2+
ions. Future studies on plants specialized on similar soils and affinity tests of the transporters are needed to provide unequivocal evidence for this hypothesis. If verified, the transporters found in this study might be useful for breeding Brassicaceae crops for higher yield on Ca
2+
-rich and Mg
2+
-poor soils.