Plant Physiology 95:760-767 (1991)
© 1991 American Society of Plant Biologists
Environmental and Stress Physiology
Response to Anoxia in Rice and Wheat Seedlings
Changes in the pH of Intracellular Compartments, Glucose-6-Phosphate Level, and Metabolic Rate
Faustino Menegus,
Liliana Cattaruzza,
Monica Mattana,
Nicoletta Beffagna and
Enzio Ragg
Istituto Biosintesi Vegetali, CNR, Via Bassini 15, 20133 Milano, Italy,
Centro per lo studio sulla Biologia Cellulare e Molecolare delle Piante, Via Celoria 26, 20133 Milano, Italy,
Dipartimento di Scienze Molecolari Agroalimentari, Facoltà di Agraria, Via Celoria 2, 20133 Milano, Italy
31P nuclear magnetic resonance spectroscopy was used to measure intracellular pH in living tissues. Oxygen deprivation caused fast cytoplasmic acidification from pH 7.4 to 7.0 in shoots of rice, Oryza sativa L. var arborio, a species highly resistant to anoxia. Acidification was complete after 10 minutes of anoxia. Alkalinization of both cytosplasm and vacuole followed thereafter. In the anoxia intolerant wheat shoots, Triticum aestivum L. var MEK, the same treatment caused a sharper cytoplasmic acidification, from pH 7.4 to 6.6, which occurred during a period of 2 hours. Cytoplasmic acidification continued with progress of anoxia and there was no vacuolar alkalinization comparable to the one observed in rice. In wheat oxyen, withdrawal also caused the reduction of both glucose-6-phosphate level and of metabolic rate. It also induced heavy losses of inorganic phosphate from tissues. Conversely, in rice, glucose-6-phosphate level and metabolic rate were increased and inorganic phosphate leakage from tissues was completely absent. These results are discussed in relation to the mechanisms of plant resistance to anoxia.
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