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KMID : 0368420120550020143
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Journal of Plant Biology
2012 Volume.55 No. 2 p.143 ~ p.150
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Calcium Could Be Involved in Auxin-Regulated Maintenance of the Quiescent Center in the Arabidopsis Root
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Goh Chang-Sook
Lee Yew
Kim Soo-Hwan
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Abstract
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Ca2+ transduces hormone and environmental signals to the Ca2+ sensors and relays them to the downstream target effectors in cells. During the post-embryonic developmental process, auxin plays a critical role in maintaining the mitotically inactive status of the quiescent center (QC) and the root growth and development that follows. In this report, we demonstrate that Ca2+ plays an important role in the maintenance of the QC, probably by regulating PIN1-mediated auxin transport. Perturbation of the intracellular Ca2+ levels with chemicals that modify the Ca2+ level decreases the endogenous auxin level and the size of the auxin maximum in the root tip and, at the same time, activates QC cell division and expansion. This decreased level of auxin is almost completely restored to the control level by the treatment of exogenous auxin. Interestingly, treatment with Ca2+ level modifying chemicals significantly decreased the PIN1 expression in the root vasculature. Taken together, we suggest that balancing Ca2+ homeostasis is one of contributing factors in establishing the proper auxin maximum in the root tip and maintaining the QC identity.
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KEYWORD
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Auxin, Auxin maximum, Calcium homeostasis, PIN, Quiescent center, Root apical meristem
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