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Ranf, S.; Wünnenberg, P.; Lee, J.; Becker, D.; Dunkel, M.; Hedrich, R.; Scheel, D.; Dietrich, P.; Loss of the vacuolar cation channel, AtTPC1, does not impair Ca2+ signals induced by abiotic and biotic stresses Plant J. 53 287-299 (2008) DOI: 10.1111/j.1365-313X.2007.03342.x
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The putative two‐pore Ca2+ channel TPC1 has been suggested to be involved in responses to abiotic and biotic stresses. We show that AtTPC1 co‐localizes with the K+‐selective channel AtTPK1 in the vacuolar membrane. Loss of AtTPC1 abolished Ca2+‐activated slow vacuolar (SV) currents, which were increased in AtTPC1 ‐over‐expressing Arabidopsis compared to the wild‐type. A Ca2+‐insensitive vacuolar cation channel, as yet uncharacterized, could be resolved in tpc1‐2 knockout plants. The kinetics of ABA‐ and CO2‐induced stomatal closure were similar in wild‐type and tpc1‐2 knockout plants, excluding a role of SV channels in guard‐cell signalling in response to these physiological stimuli. ABA‐, K+‐, and Ca2+‐dependent root growth phenotypes were not changed in tpc1‐2 compared to wild‐type plants. Given the permeability of SV channels to mono‐ and divalent cations, the question arises as to whether TPC1 in vivo represents a pathway for Ca2+ entry into the cytosol. Ca2+ responses as measured in aequorin‐expressing wild‐type, tpc1‐2 knockout and TPC1 ‐over‐expressing plants disprove a contribution of TPC1 to any of the stimulus‐induced Ca2+ signals tested, including abiotic stresses (cold, hyperosmotic, salt and oxidative), elevation in extracellular Ca2+ concentration and biotic factors (elf18, flg22). In good agreement, stimulus‐ and Ca2+‐dependent gene activation was not affected by alterations in TPC1 expression. Together with our finding that the loss of TPC1 did not change the activity of hyperpolarization‐activated Ca2+‐permeable channels in the plasma membrane, we conclude that TPC1, under physiological conditions, functions as a vacuolar cation channel without a major impact on cytosolic Ca2+ homeostasis.

Publications

Wang, H.; Liu, Y.; Bruffett, K.; Lee, J.; Hause, G.; Walker, J. C.; Zhang, S.; Haplo-Insufficiency of MPK3 in MPK6 Mutant Background Uncovers a Novel Function of These Two MAPKs in Arabidopsis Ovule Development Plant Cell 20 602-613 (2008) DOI: 10.1105/tpc.108.058032
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The plant life cycle includes diploid sporophytic and haploid gametophytic generations. Female gametophytes (embryo sacs) in higher plants are embedded in specialized sporophytic structures (ovules). Here, we report that two closely related mitogen-activated protein kinases in Arabidopsis thaliana, MPK3 and MPK6, share a novel function in ovule development: in the MPK6 mutant background, MPK3 is haplo-insufficient, giving female sterility when heterozygous. By contrast, in the MPK3 mutant background, MPK6 does not show haplo-insufficiency. Using wounding treatment, we discovered gene dosage–dependent activation of MPK3 and MPK6. In addition, MPK6 activation is enhanced when MPK3 is null, which may help explain why mpk3−/− mpk6+/− plants are fertile. Genetic analysis revealed that the female sterility of mpk3+/− mpk6−/− plants is a sporophytic effect. In mpk3+/− mpk6−/− mutant plants, megasporogenesis and megagametogenesis are normal and the female gametophyte identity is correctly established. Further analysis demonstrates that the mpk3+/− mpk6−/− ovules have abnormal integument development with arrested cell divisions at later stages. The mutant integuments fail to accommodate the developing embryo sac, resulting in the embryo sacs being physically restricted and female reproductive failure. Our results highlight an essential function of MPK3 and MPK6 in promoting cell division in the integument specifically during ovule development.

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