Nitrate reductase mutation alters potassium nutrition as well as nitric oxide-mediated control of guard cell ion channels in Arabidopsis

Chen, Z.-H. et al. (2016) Nitrate reductase mutation alters potassium nutrition as well as nitric oxide-mediated control of guard cell ion channels in Arabidopsis. New Phytologist, 209(4), pp. 1456-1469. (doi: 10.1111/nph.13714) (PMID:26508536)

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Maintaining potassium (K+) nutrition and a robust guard cell K+ inward channel activity is considered critical for plants’ adaptation to fluctuating and challenging growth environment. ABA induces stomatal closure through hydrogen peroxide and nitric oxide (NO) along with subsequent ion channel-mediated loss of K+ and anions. However, the interactions of NO synthesis and signalling with K+ nutrition and guard cell K+ channel activities have not been fully explored in Arabidopsis. Physiological and molecular techniques were employed to dissect the interaction of nitrogen and potassium nutrition in regulating stomatal opening, CO2 assimilation and ion channel activity. These data, gene expression and ABA signalling transduction were compared in wild-type Columbia-0 (Col-0) and the nitrate reductase mutant nia1nia2. Growth and K+ nutrition were impaired along with stomatal behaviour, membrane transport, and expression of genes associated with ABA signalling in the nia1nia2 mutant. ABA-inhibited K+in current and ABA-enhanced slow anion current were absent in nia1nia2. Exogenous NO restored regulation of these channels for complete stomatal closure in nia1nia2. While NO is an important signalling component in ABA-induced stomatal closure in Arabidopsis, our findings demonstrate a more complex interaction associating potassium nutrition and nitrogen metabolism in the nia1nia2 mutant that affects stomatal function.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hills, Mr Adrian and Blatt, Professor Michael and Amtmann, Professor Anna and Wang, Dr Yizhou and Garcia-Mata, Dr Carlos
Authors: Chen, Z.-H., Wang, Y., Wang, J.-W., Babla, M., Zhao, C., Garcia-Mata, C., Sani, E., Differ, C., Mak, M., Hills, A., Amtmann, A., and Blatt, M. R.
College/School:College of Medical Veterinary and Life Sciences > School of Molecular Biosciences
Journal Name:New Phytologist
ISSN (Online):1469-8137
Published Online:28 October 2015

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
452562Analysis of membrane traffic in adaptive stress tolerance in plantsMichael BlattBiotechnology and Biological Sciences Research Council (BBSRC)BB/F001630/1RI MOLECULAR CELL & SYSTEMS BIOLOGY