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PLANT PHYSIOLOGY , Vol 108, Issue 2 641-649, Copyright © 1995 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

Vacuolar H+-Translocating Pyrophosphatase Is Induced by Anoxia or Chilling in Seedlings of Rice

G. D. Carystinos, H. R. MacDonald, A. F. Monroy, R. S. Dhindsa and R. J. Poole
Biology Department, McGill University, 1205 Doctor Penfield Avenue, Montreal, Quebec, Canada H3A 1B1

The present study was undertaken to determine whether vacuolar H+-pyrophosphatase (V-PPase) might replace vacuolar H+-ATPase under energy stress due to anoxia or chilling in anoxia-tolerant species such as rice (Oryza sativa L.) and corn (Zea mays L.). The relative transcript level of V-PPase in rice seedlings, like that of alcohol dehydrogenase 1, increased greatly under anoxia and declined again when the seedlings were returned to air. However, the distribution of transcripts in root, shoot, and seed differed somewhat from that of alcohol dehydrogenase 1. Immunoreactive V-PPase protein and V-PPase enzyme specific activity in a tonoplast fraction from rice seedlings increased progressively with time of anoxia or chilling at 10[deg]C, showing a 75-fold increase after 6 d of anoxia, compared with a 2-fold increase of vacuolar H+-ATPase activity. When the seedlings were returned to air, the specific activity returned to its initial level within 2 d. After 6 d of chilling at 10[deg]C, V-PPase specific activity reached a level 20-fold of that at 25[deg]C. In microsomes of corn roots, V-PPase specific activity did not respond to anoxia but was constitutively high. It is proposed that V-PPase can be an important element in the survival strategies of plants under hypoxic or chilling stress.


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