Primary events regulating stem growth at low water potentials. [Glycine max (L. )]

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.93.4.1601· OSTI ID:5965645

Nonami, Hiroshi; Boyer, J S ^[1]

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1. Univ. of Delaware, Lewes (USA)

Cell enlargement is inhibited by inadequate water. As a first step toward understanding the mechanism, all the physical parameters affecting enlargement were monitored to identify those that changed first, particularly in coincidence with the inhibition. The osmotic potential, turgor, yield threshold turgor, growth-induced water potential, wall extensibility, and conductance to water were measured in the elongating region, and the water potential was measured in the xylem of stems of dark-grown soybean (Glycine max (L.) Merr.) seedlings. The results indicate that the primary event during the growth inhibition was the change in the growth-induced water potential. Because the growth limitation subsequently shifted to the low wall extensibility and tissue conductance for water, the initial change in potential may have set in motion subsequent metabolic changes that altered the characteristics of the wall and cell membranes.

• OSTI ID: 5965645
• Journal Information: Plant Physiology; (USA), Vol. 93:4; ISSN 0032-0889
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
59 BASIC BIOLOGICAL SCIENCES
DROUGHTS
BIOLOGICAL EFFECTS
GLYCINE HISPIDA
PLANT GROWTH
CELL WALL
HYDRAULIC CONDUCTIVITY
INHIBITION
METABOLISM
PLANT STEMS
SEEDLINGS
CELL CONSTITUENTS
GROWTH
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
PLANTS
540210* - Environment
Terrestrial- Basic Studies- (1990-)
551000 - Physiological Systems