Further evidence that cytoplasmic acidosis is a determinant of flooding intolerance in plants

We present two pieces of evidence that regulation of cytoplasmic pH near neutrality is a prerequisite for survival of root tips during hypoxia. First, blackeye peas and navy beans show earlier cytoplasmic acidosis under hypoxia than soybeans or pumpkin or maize, and die earlier. Second, when cytopla...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1985-02, Vol.77 (2), p.492-494
Main Authors: Roberts, J.K.M, Andrade, F.H, Anderson, I.C
Format: Article
Language:English
Subjects:
ACIDOSE
ACIDOSIS
Agronomy. Soil science and plant productions
Biological and medical sciences
CITOPLASMA
Corn
CYTOPLASM
CYTOPLASME
Economic plant physiology
FLOODING
Fundamental and applied biological sciences. Psychology
Hypoxia
INONDATION
INTOLERANCE
INUNDACION
Navies
Nitrates
Peas
Plant physiology and development
Plant roots
PLANTAS
PLANTE
PLANTS
Root tips
Short Communications
Soybeans
Viability
Water and solutes. Absorption, translocation and permeability
Water relations, transpiration, stomata
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Summary:We present two pieces of evidence that regulation of cytoplasmic pH near neutrality is a prerequisite for survival of root tips during hypoxia. First, blackeye peas and navy beans show earlier cytoplasmic acidosis under hypoxia than soybeans or pumpkin or maize, and die earlier. Second, when cytoplasmic acidosis in maize root tips is greatly retarded by treatment with 25 millimolar $\text{Ca}(\text{NO}_{3})_{2}$, they remain viable under hypoxia for a much longer period of time than untreated hypoxic root tips. We also show that viability of maize root tips is unaffected by the supply of exogenous sugar (and so on the rate of ethanolic fermentation) for at least 16 hours of hypoxia.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.77.2.492