An ICln homolog contributes to osmotic and low‐nitrate tolerance by enhancing nitrate accumulation in Arabidopsis
- 25 January 2021
- journal article
- research article
- Published by Wiley in Plant, Cell & Environment
- Vol. 44 (5), 1580-1595
- https://doi.org/10.1111/pce.14005
Abstract
Nitrate (NO3−) is a source of plant nutrients and osmolytes, but its delivery machineries under osmotic and low‐nutrient stress remain largely unknown. Here, we report that AtICln, an Arabidopsis homolog of the nucleotide‐sensitive chloride‐conductance regulatory protein family (ICln), is involved in response to osmotic and low‐NO3− stress. The gene AtICln, encoding plasma membrane–anchored proteins, was upregulated by various osmotic stresses, and its disruption impaired plant tolerance to osmotic stress. Compared with the wild type, the aticln mutant retained lower anions, particularly NO3−, and its growth retardation was not rescued by NO3− supply under osmotic stress. Interestingly, this mutant also displayed growth defects under low‐NO3 stress, which were accompanied by decreases in NO3− accumulation, suggesting that AtICln may facilitate the NO3− accumulation under NO3− deficiency. Moreover, the low‐NO3− hypersensitive phenotype of aticln mutant was overridden by the overexpression of NRT1.1, an important NO3− transporter in Arabidopsis low‐NO3− responses. Further genetic analysis in the plants with altered activity of AtICln and NRT1.1 indicated that AtICln and NRT1.1 play a compensatory role in maintaining NO3− homeostasis under low‐NO3− environments. These results suggest that AtICln is involved in cellular NO3− accumulation and thus determines osmotic adjustment and low‐NO3− tolerance in plants.Keywords
Funding Information
- National Natural Science Foundation of China (31670236, 31770267)
This publication has 51 references indexed in Scilit:
- Phosphatidylinositol 3-phosphate–binding protein AtPH1 controls the localization of the metal transporter NRAMP1 in ArabidopsisProceedings of the National Academy of Sciences of the United States of America, 2017
- Osmotic adjustment is a prime drought stress adaptive engine in support of plant productionPlant, Cell & Environment, 2016
- Multiple mechanisms of nitrate sensing by Arabidopsis nitrate transceptor NRT1.1Nature Plants, 2015
- Anion Channels/Transporters in Plants: From Molecular Bases to Regulatory NetworksAnnual Review of Plant Biology, 2011
- Cl‐ homeostasis in includer and excluder citrus rootstocks: transport mechanisms and identification of candidate genesPlant, Cell & Environment, 2010
- Sex‐related adaptive responses to interaction of drought and salinity in Populus yunnanensisPlant, Cell & Environment, 2010
- FM‐dyes as experimental probes for dissecting vesicle trafficking in living plant cellsJournal of Microscopy, 2004
- Floral dip: a simplified method forAgrobacterium‐mediated transformation ofArabidopsis thalianaThe Plant Journal, 1998
- Plant Productivity and EnvironmentScience, 1982
- Rapid colorimetric determination of nitrate in plant tissue by nitration of salicylic acidCommunications in Soil Science and Plant Analysis, 1975