
Dr. Julian Schroeder
Previous studies suggest that uptake of heavy metals into plants via the root system could provide a potent and cost effective approach for toxic metal removal and remediation of soils and waters. In plants and fungi, phytochelatins are major heavy metal chelating and detoxifying thiolate peptides that form complexes with and detoxify heavy metals, including Cd, Zn, Pb, Hg and As. The enzyme phytochelatin synthase (PCS) produces phytochelatins, thus functioning as a major catalytic metal detoxification mechanism in plants. Project researchers are testing the hypotheses that stress-signaling pathways contribute to PCS induction and detoxification, and that transgenic expression of PCS genes can, together with other metal-interacting mechanisms, enhance heavy metal hyperaccumulation and removal by plants. Results from these studies could play a central role in the development of future phytoremediation strategies for heavy metal uptake and biological removal of heavy metals from contaminated soils and waters.
UCSD SBRP researcher Julian Schroeder named a Fellow of the AAAS
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Hauser, F. Waadt, R. & Schroeder, J.I.. Evolution of abscisic acid synthesis and signaling mechanisms. Curr Biol. 10;21(9):R346-55, 2011. PMC Pending
PubMed ID: 21549957
Böhmer, M. & Schroeder, J. I. Quantitative transcriptomic analysis of ABA-induced and ROSdependent expression changes and proteomic profiling in Arabidopsis suspension cells Plant Journal 10.1111/j.1365-313X.2011.04579.x. Epub ahead of Print, 2011. PMCID-Pending
PubMed ID: 21426425
Song*, W.Y., Park*, J., Mendoza-Cózatl*, D.G., Suter-Grotemeyer, M., Shim, D., Hörtensteiner, S., Geisler, M., Weder, B., Rea, P.A., Rentsch, D., Schroeder, J.I., Lee#, Y., Martinoia, E. Arsenic tolerance in Arabidopsis is mediated by two ABCC-type phytochelatin transporters. Proc. Natl. Acad. Sci. (USA) 107: 21187-92 (2010). PMC21078981.
PubMed ID: 21078981
Mendoza-Cozatl, D.G., Zhai, Z., Jobe, T.O., Akmakjian, G.Z., Song, W.Y., Limbo, O., Russell, M.R., Kozlovskyy, V.I., Martinoia, E., Vatamaniuk, O.K., Russell, P., Schroeder, J.I. Tonoplast-localized Abc2 Transporter Mediates Phytochelatin Accumulation in Vacuoles and Confers Cadmium Tolerance. J. Biol. Chem. 285: 40416-26 (2010). PMC3003340.
PubMed ID: 20937798
Li, J-Y., Fu, Y-L., Pike, S.M., Bao, J., Tian, W., Zhang, Y., Chen, C-Z., Zhang, Y., Li, H-M., Huang, J., Li, L-G., Schroeder, J.I., Gassmann, W., Gong, J-M. The Arabidopsis nitrate transporter NRT1.8 functions in nitrate removal from the xylem and mediates cadmium tolerance. Plant Cell 22: 1633-46 (2010). PMC2899866.
PubMed ID: 20501909
Pyo, Y.J., Gierth, M., Schroeder, J.I., Cho, M.H. High-affinity K+ transport in Arabidopsis: AtHAK5 and AKT1 are vital for seedling establishment and postgermination growth under low-potassium conditions. Plant Physiol. 153: 863-75 (2010). PMC2879780
PubMed ID: 20413648
Yao, X., Horie, T., Xue, S., Leung, H. Y., Katsuhara, M., Brodsky, D. E., Wu, Y. & Schroeder, J. I. Differential sodium and potassium transport selectivities of the rice OsHKT2;1 and OsHKT2;2 transporters in plant cells. Plant Physiol 152, 341-55 (2010). PMC2799368
PubMed ID: 19889878
Sadi, B. B., Vonderheide, A. P., Gong, J. M., Schroeder, J. I., Shann, J. R. & Caruso, J. A. An HPLC-ICP-MS technique for determination of cadmium-phytochelatins in genetically modified Arabidopsis thaliana. J Chromatogr B Analyt Technol Biomed Life Sci 861, 123-9 (2008). PMC2850270
PubMed ID: 18065298
Costa A, Drago I, Behera S, Zottini M, Pizzo P, Schroeder JI, Pozzan T, Schiavao FL. H(2)O(2) in plant peroxisomes: an in vivo analysis uncovers a Ca(2+)-dependent scavenging system. Plant J. 1; 62(5): 760-772, 2010. PMC2884081
PubMed ID: 20230493
Kim TH, Bohmer M, Hu H, Nishimura N, Schroeder JI. Guard cell signal transduction network: advances in understanding Abscisic acid, CO2, and Ca2+ signaling. Annual Review of Plant Biology Epub Ahead of Print, 2010. PMC3056615
PubMed ID: 20192751
Nishimura N, Sarkeshik A, Nito K, Park SY, Wang A, Carvalho PC, Lee S, Caddell DF, Cutler SR, Chory J, Yates JR, Schroeder JI. PYR/PYL/RCAR family members are major in-vivo ABI1 protein phosphatase 2C-interacting proteins in Arabidopsis. Plant J. 61: 290-299, 2010. PMC2807913
PubMed ID: 19874541
Yao X, Horie T, Xue S, Leung HY, Katsuhara M, Brodsky DE, Wu Y, Schroeder JI. Differential sodium and potassium transport selectivities of the rice OsHKT2;1 and OsHKT2;2 transporters in plant cells. Plant Physiol. 152:341-355, 2010.
PubMed ID: 19889878
Horie T, Hauser F, Schroeder JI. HKT transporter-mediated salinity resistance mechanisms in Arabidopsis and monocot crop plants. Trends Plant Sci. 14: 660-668, 2009. PMC2787891
PubMed ID: 19783197
Ward JM, Mäser P, Schroeder JI. Plant ion channels: gene families, physiology, and functional genomics analyses. Annu Rev Physiol 71:59-82, 2009.
PubMed ID: 18842100
Sung DY, Kim TH, Komives EA, Mendoza-Cózatl DG, Schroeder JI. ARS5 is a component of the 26S proteasome complex, and negatively regulates thiol biosynthesis and arsenic tolerance in Arabidopsis. Plant J. 59(5):802-13, 2009. PMC2830867
PubMed ID: 19453443
Nishimura N, Hitomi K, Arvai AS, Rambo RP, Hitomi C, Cutler SR, Schroeder JI, Getzoff ED. Structural mechanism of abscisic acid binding and signaling by dimeric PYR1. Science. 326(5958):1373-9. 2009. PMC2807913
PubMed ID: 19933100
Kim, Y.Y., Kim, D.Y., Shim, D., Song, W.Y., Lee, J., Schroeder, J.I., Kim, S., Moran, N., Lee Y. Expression of the Novel Wheat Gene TM20 Confers Enhanced Cadmium Tolerance to Bakers Yeast.JBiolChem.283:15893-15892(2008). PMC2414300
PubMed ID: 18411273
Mendoza-Cozatl DG, Butko E, Springer F, Torpey JW, Komives EA, Kehr J, Schroeder JI. Identification of high levels of phytochelatins, glutathione and cadmium in the phloem sap of Brassica napus. A role for thiol-peptides in the long-distance transport of cadmium and the effect of cadmium on iron translocation. Plant Journal 54: 249-59, 2008. PMC2839885
PubMed ID: 18208526
Vahisalu, T., Kollist, H., Wang, Y.‐F., Nishimura, N., Chan, W.‐Y., Valerio, G., Lamminmaki, A., Brosche, M., Moldau, H., Desikan, R., Schroeder, J.I., Kangasjarvi, J. SLAC1 is required for plant guard cell S‐type anion channel function in
stomatal signalling. Nature 452:487‐91 (2008). PMC2858982
PubMed ID: 18305484
Horie T, Sugawara M, Okunou K, Nakayama H, Schroeder JI, Shinmyo A, Yoshida K. Functions of HKT transporters in sodium transport in roots and in protecting leaves from salinity stress. Plant Biotechnology 25: 233-239, 2008.
PubMed ID: Link to Pub
Horie, T., Costa, A., Kim, TH, Han, MH, Horie, R., Leung, HY, Miyao, A., Hirochika, H., An, G. and Schroeder, J.I. Rice OsHKT2;1 transporter mediates large Na+ influx component into K+-starved roots for growth. EMBO J. 26: 3003-3014, 2007.
PubMed ID: 17541409
Sung DY, Lee D, Harris H, Raab A, Feldmann J, Meharg A, Kumabe B, Komives EA, Schroeder JI. Identification of an arsenic tolerant double mutant with a thiol-mediated component and increased arsenic tolerance in phyA mutants. Plant J. 49:1064-1075, 2007.
PubMed ID: 17335514
Imaizumi T, Kay SA, Schroeder JI. Circadian rhythms. Daily watch on metabolism. Science: 318: 1730-1731, 2007.
PubMed ID: 18006706
Imaizumi T, Schroeder JI, Kay SA. In SYNC: the ins and outs of circadian oscillations in calcium. Sci STKE: 390: pe32, 2007.
PubMed ID: 17565121
Chen A, Komives EA, Schroeder JI. An improved grafting technique for mature Arabidopsis plants demonstrates long-distance shoot-to-root transport of phytochelatins in Arabidopsis. Plant Physiology 141: 108-120, 2006.
PubMed ID: 16531489
Kwak JM, Nguyen V, Schroeder JI. The role of reactive oxygen species in hormonal responses. Plant Physiology 141: 323-329, 2006.
PubMed ID: 16760482
Platten JD, Cotsaftis O, Berthomieu P, Bohnert H, Davenport RJ, Fairbairn DJ, Horie T, Leigh RA, Lin HX, Luan S, Maser P, Pantoja O, Rodriguez-Navarro A, Schachtman DP, Schroeder JI, Sentenac H, Uozumi N, Very AA, Zhu JK, Dennis ES, Tester M. Nomenclature for HKT transporters, key determinants of plant salinity tolerance. Trends Plant Sci. 11: 372-374, 2006.
PubMed ID: 16809061
Schroeder JI, Nambara E. A quick release mechanism for abscisic acid. Cell 126: 1023-1025, 2006.
PubMed ID: 16990126
Schroeder JI, Kuhn JM. Plant biology abscisic acid in bloom. Nature 439: 277-278, 2006.
PubMed ID: 16421556
Sunarpi, Horie T, Motoda J, Kubo M, Yang H, Yoda K, Horie R, Chan W, Leung H-Y, Hattori K, Konomi M, Osumi M, Yamagami M, *Schroeder JI, *Uozumi N. (* corresponding authors) Enhanced salt tolerance mediated by AtHKT1 transporter-induced Na+ unloading from xylem parenchyma cells. Pl. Journal 44: 928-938, 2005.
PubMed ID: 16359386
Gong JM, Waner DA, Horie T, Li SL, Horie R, Abid KB, Schroeder JI. Microarray-based rapid cloning of an ion accumulation deletion mutant in Arabidopsis thaliana. Proc. Natl. Acad. Sci (USA) 101: 15404-15409, 2004.
PubMed ID: 15486089
Li Y, Dhankher OP, Carreira L, Lee D, Chen A, Schroeder JI, Balish RS, Meagher RB. Overexpression of phytochelatin synthase in Arabidopsis leads to enhanced arsenic tolerance and cadmium hypersensitivity. Plant Cell Physiol. 45: 1787-1797, 2004.
PubMed ID: 15653797
Mori I and Schroeder JI. Reactive Oxygen Species Activation of Plant Ca2+ Channels: A Signaling Mechanism in Polar Growth, Hormone Transduction, Stress Signaling, and Hypothetically Mechano-transduction. Plant Physiology 135(2): 702-708, 2004.
PubMed ID: 15208417
Wycisk K, Kim EJ, Schroeder JI, Kramer U. Enhancing the First Enzymatic Step in Histidine Biosynthesis Pathway Increases the Free Histidine Pool and Nickel Tolerance in Arabidosis Thaliana. FEBS Letters 578: 128-134, 2004.
PubMed ID: 15581629