2
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Percey WJ, McMinn A, Bose J, Breadmore MC, Guijt RM, Shabala S. Salinity effects on chloroplast PSII performance in glycophytes and halophytes. FUNCTIONAL PLANT BIOLOGY : FPB 2016; 43:1003-1015. [PMID: 32480522 DOI: 10.1071/fp16135] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 06/12/2016] [Indexed: 06/11/2023]
Abstract
The effects of NaCl stress and K+ nutrition on photosynthetic parameters of isolated chloroplasts were investigated using PAM fluorescence. Intact mesophyll cells were able to maintain optimal photosynthetic performance when exposed to salinity for more than 24h whereas isolated chloroplasts showed declines in both the relative electron transport rate (rETR) and the maximal photochemical efficiency of PSII (Fv/Fm) within the first hour of treatment. The rETR was much more sensitive to salt stress compared with Fv/Fm, with 40% inhibition of rETR observed at apoplastic NaCl concentration as low as 20mM. In isolated chloroplasts, absolute K+ concentrations were more essential for the maintenance of the optimal photochemical performance (Fv/Fm values) rather than sodium concentrations per se. Chloroplasts from halophyte species of quinoa (Chenopodium quinoa Willd.) and pigface (Carpobrotus rosii (Haw.) Schwantes) showed less than 18% decline in Fv/Fm under salinity, whereas the Fv/Fm decline in chloroplasts from glycophyte pea (Pisum sativum L.) and bean (Vicia faba L.) species was much stronger (31 and 47% respectively). Vanadate (a P-type ATPase inhibitor) significantly reduced Fv/Fm in both control and salinity treated chloroplasts (by 7 and 25% respectively), whereas no significant effects of gadolinium (blocker of non-selective cation channels) were observed in salt-treated chloroplasts. Tetraethyl ammonium (TEA) (K+ channel inhibitor) and amiloride (inhibitor of the Na+/H+ antiporter) increased the Fv/Fm of salinity treated chloroplasts by 16 and 17% respectively. These results suggest that chloroplasts' ability to regulate ion transport across the envelope and thylakoid membranes play a critical role in leaf photosynthetic performance under salinity.
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Affiliation(s)
- William J Percey
- School of Land and Food, University of Tasmania, Private Bag 54, Hobart 7001, Australia
| | - Andrew McMinn
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart 7001, Australia
| | - Jayakumar Bose
- School of Land and Food, University of Tasmania, Private Bag 54, Hobart 7001, Australia
| | - Michael C Breadmore
- Australian Centre for Research on Separation Science (ACROSS) and School of Chemistry, University of Tasmania, Private Bag 75, Hobart 7001, Australia
| | - Rosanne M Guijt
- School of Medicine and Australian Centre for Research on Separation Science, University of Tasmania, Private Bag 34, Hobart 7001, Australia
| | - Sergey Shabala
- School of Land and Food, University of Tasmania, Private Bag 54, Hobart 7001, Australia
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3
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Aranda-Sicilia MN, Aboukila A, Armbruster U, Cagnac O, Schumann T, Kunz HH, Jahns P, Rodríguez-Rosales MP, Sze H, Venema K. Envelope K+/H+ Antiporters AtKEA1 and AtKEA2 Function in Plastid Development. PLANT PHYSIOLOGY 2016; 172:441-9. [PMID: 27443603 PMCID: PMC5074627 DOI: 10.1104/pp.16.00995] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 07/19/2016] [Indexed: 05/04/2023]
Abstract
It is well established that thylakoid membranes of chloroplasts convert light energy into chemical energy, yet the development of chloroplast and thylakoid membranes is poorly understood. Loss of function of the two envelope K(+)/H(+) antiporters AtKEA1 and AtKEA2 was shown previously to have negative effects on the efficiency of photosynthesis and plant growth; however, the molecular basis remained unclear. Here, we tested whether the previously described phenotypes of double mutant kea1kea2 plants are due in part to defects during early chloroplast development in Arabidopsis (Arabidopsis thaliana). We show that impaired growth and pigmentation is particularly evident in young expanding leaves of kea1kea2 mutants. In proliferating leaf zones, chloroplasts contain much lower amounts of photosynthetic complexes and chlorophyll. Strikingly, AtKEA1 and AtKEA2 proteins accumulate to high amounts in small and dividing plastids, where they are specifically localized to the two caps of the organelle separated by the fission plane. The unusually long amino-terminal domain of 550 residues that precedes the antiport domain appears to tether the full-length AtKEA2 protein to the two caps. Finally, we show that the double mutant contains 30% fewer chloroplasts per cell. Together, these results show that AtKEA1 and AtKEA2 transporters in specific microdomains of the inner envelope link local osmotic, ionic, and pH homeostasis to plastid division and thylakoid membrane formation.
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Affiliation(s)
- María Nieves Aranda-Sicilia
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Ali Aboukila
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Ute Armbruster
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Olivier Cagnac
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Tobias Schumann
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Hans-Henning Kunz
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Peter Jahns
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - María Pilar Rodríguez-Rosales
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Heven Sze
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
| | - Kees Venema
- Departimento de Bioquímica, Biología Celular, y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain (M.N.A.-S., A.A., O.C., M.P.R.-R., K.V.);Howard Hughes Medical Institute, Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (U.A.);Institute of Plant Biochemistry, Heinrich-Heine-University Düsseldorf, D-40225 Duesseldorf, Germany (T.S., P.J.);School of Biological Sciences, Washington State University, Pullman, Washington 99164-4236 (H.-H.K.); andDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742 (H.S.)
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4
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Wu H, Shabala L, Barry K, Zhou M, Shabala S. Ability of leaf mesophyll to retain potassium correlates with salinity tolerance in wheat and barley. PHYSIOLOGIA PLANTARUM 2013; 149:515-27. [PMID: 23611560 DOI: 10.1111/ppl.12056] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 03/11/2013] [Accepted: 03/19/2013] [Indexed: 05/18/2023]
Abstract
This work investigated the importance of the ability of leaf mesophyll cells to control K(+) flux across the plasma membrane as a trait conferring tissue tolerance mechanism in plants grown under saline conditions. Four wheat (Triticum aestivum and Triticum turgidum) and four barley (Hordeum vulgare) genotypes contrasting in their salinity tolerance were grown under glasshouse conditions. Seven to 10-day-old leaves were excised, and net K(+) and H(+) fluxes were measured from either epidermal or mesophyll cells upon acute 100 mM treatment (mimicking plant failure to restrict Na(+) delivery to the shoot) using non-invasive microelectrode ion flux estimation (the MIFE) system. To enable net ion flux measurements from leaf epidermal cells, removal of epicuticular waxes was trialed with organic solvents. A series of methodological experiments was conducted to test the efficiency of different methods of wax removal, and the impact of experimental procedures on cell viability, in order to optimize the method. A strong positive correlation was found between plants' ability to retain K(+) in salt-treated leaves and their salinity tolerance, in both wheat and especially barley. The observed effects were related to the ionic but not osmotic component of salt stress. Pharmacological experiments have suggested that voltage-gated K(+) -permeable channels mediate K(+) retention in leaf mesophyll upon elevated NaCl levels in the apoplast. It is concluded that MIFE measurements of NaCl-induced K(+) fluxes from leaf mesophyll may be used as an efficient screening tool for breeding in cereals for salinity tissue tolerance.
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Affiliation(s)
- Honghong Wu
- School of Agricultural Science and Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Lana Shabala
- School of Agricultural Science and Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Karen Barry
- School of Agricultural Science and Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Meixue Zhou
- School of Agricultural Science and Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Sergey Shabala
- School of Agricultural Science and Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania, 7001, Australia
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Zanetti M, Teardo E, La Rocca N, Zulkifli L, Checchetto V, Shijuku T, Sato Y, Giacometti GM, Uozumi N, Bergantino E, Szabò I. A novel potassium channel in photosynthetic cyanobacteria. PLoS One 2010; 5:e10118. [PMID: 20404935 PMCID: PMC2853561 DOI: 10.1371/journal.pone.0010118] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2009] [Accepted: 03/12/2010] [Indexed: 12/20/2022] Open
Abstract
Elucidation of the structure-function relationship of a small number of prokaryotic ion channels characterized so far greatly contributed to our knowledge on basic mechanisms of ion conduction. We identified a new potassium channel (SynK) in the genome of the cyanobacterium Synechocystis sp. PCC6803, a photosynthetic model organism. SynK, when expressed in a K(+)-uptake-system deficient E. coli strain, was able to recover growth of these organisms. The protein functions as a potassium selective ion channel when expressed in Chinese hamster ovary cells. The location of SynK in cyanobacteria in both thylakoid and plasmamembranes was revealed by immunogold electron microscopy and Western blotting of isolated membrane fractions. SynK seems to be conserved during evolution, giving rise to a TPK (two-pore K(+) channel) family member which is shown here to be located in the thylakoid membrane of Arabidopsis. Our work characterizes a novel cyanobacterial potassium channel and indicates the molecular nature of the first higher plant thylakoid cation channel, opening the way to functional studies.
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Affiliation(s)
| | - Enrico Teardo
- Department of Biology, University of Padova, Padova, Italy
| | | | - Lalu Zulkifli
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | | | - Toshiaki Shijuku
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Yuki Sato
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | | | - Noboyuki Uozumi
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | | | - Ildikò Szabò
- Department of Biology, University of Padova, Padova, Italy
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