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. 2020 Jun 29;9(7):814. doi: 10.3390/plants9070814

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The Medicago truncatula dehydrin gene, MtCAS31 (Medtr6g084640; highly similar to the Arabidopsis ERD10 (At1g20450) and ERD14 (At1g76180) pfam dehydrin) is upregulated by drought stress. When MtCAS31 protein is present, it binds one of several leghemoglobin proteins (MtLb120-1; Medtr5g080440), protecting it from dehydration induced denaturation. The continued functioning of leghemoglobin, safeguarded by MtCAS31, maintains the appropriate oxygen level in nodules conducive to both nitrogenase activity and bacterial respiration, supporting nodule persistence.