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NaCl-Induced Alterations in Both Cell Structure and Tissue-Specific Plasma Membrane H⁺-ATPase Gene Expression
Xiaomu Niu, Barbara Damsz, Andrzej K. Kononowicz, Ray A. Bressan and Paul M. Hasegawa
Vol. 111, No. 3 (Jul., 1996), pp. 679-686
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4277212
Page Count: 8
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NaCl-induced plasma membrane H+-ATPase gene expression, which occurs in roots and fully expanded leaves of the halophyte Atriplex nummularia L. (X. Niu, M. L. Narasimhan, R. A. Salzman, R. A. Bressan, P. M. Hasegawa  Plant Physiol 103: 713-718), has been differentially localized to specific tissues using in situ RNA hybridization techniques. Twenty-four-hour exposure of plants to 400 mM NaCl resulted in substantial accumulation of H+ pump message in the epidermis of the root tip and the endodermis of the root elongation/differentiation zone. In expanded leaves, NaCl induction of plasma membrane H+-ATPase message accumulation was localized to bundle-sheath cells. Ultrastructural analyses indicated that significant cytological adaptations in root cells included plasmolysis that is accompanied by plasma membrane invaginations, formation of Hechtian strands and vesiculation, and vacuolation. These results identify specific tissues that are involved in the regulation of Na+ and Cl- uptake into different organs of the halophyte A. nummularia and provide evidence of the intercellular and interorgan coordination that occurs in the mediation of NaCl adaptation.
Plant Physiology © 1996 American Society of Plant Biologists (ASPB)