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PLANT PHYSIOLOGY , Vol 115, Issue 4 1499-1503, Copyright © 1997 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Specific Localization of the Respiratory Alternative Oxidase in Meristematic and Xylematic Tissues from Developing Soybean Roots and Hypocotyls

M. Hilal, A. Castagnaro, H. Moreno and E. M. Massa
Departamento Bioquimica de la Nutricion, Instituto Superior de Investigaciones Biologicas, Consejo Nacional de Investigaciones Cientificas y Technologicas-Universidad Nacional de Tucuman, and Instituto de Quimica Biologica Dr. Bernabe Bloj, Chacabuco 461, San Miguel de Tucuman, (4000) Argentina

We used tissue printing and specific immunostaining to examine the localization of the alternative oxidase (AOX) protein in correlation with measurements of AOX capacity. Selected root and hypocotyl regions were analyzed during the first 14 d of growth. It is shown that AOX protein is localized in the apical meristem and in developing xylem. The temporal pattern of expression is coincident with the evolution of AOX capacity. Data suggest that AOX expression is linked to xylem differentiation. Since heat is a major product of the alternative pathway, we speculate that thermogenesis is implicated in morphogenesis.


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A. L. Umbach, F. Fiorani, and J. N. Siedow
Characterization of Transformed Arabidopsis with Altered Alternative Oxidase Levels and Analysis of Effects on Reactive Oxygen Species in Tissue
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[Abstract] [Full Text] [PDF]

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F. F. Millenaar, M. A. Gonzàlez-Meler, F. Fiorani, R. Welschen, M. Ribas-Carbo, J. N. Siedow, A. M. Wagner, and H. Lambers
Regulation of Alternative Oxidase Activity in Six Wild Monocotyledonous Species. An in Vivo Study at the Whole Root Level
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M. Hilal, A. M. Zenoff, G. Ponessa, H. Moreno, and E. M. Massa
Saline Stress Alters the Temporal Patterns of Xylem Differentiation and Alternative Oxidase Expression in Developing Soybean Roots
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