Water deficit effect on ABA accumulation in leaves of two Phaseolus species that differ in drought tolerance

Conference · Wed May 01 04:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5514065

Janssen, M G; Markhart, A H ^[1]

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1. Univ. of Minnesota, St. Paul (United States)

Phaseolus acutifolius Gray (Pa) is regarded as a dehydration postponer and has stomata that are more sensitive to low leaf water potential than P. vulgaris L. (Pv). This study was designed to determine if the greater sensitivity of Pa stomata is related to greater ABA concentration in Pa or to a greater sensitivity of Pa stomata to ABA. To test these hypotheses bulk leaf ABA accumulation was measured and the sensitivity to ABA was monitored using epidermal strips. To determine if part of the ABA accumulated in the leaves is produced in the roots a novel detached leaf system was used. Stomatal behavior and ABA accumulation at low leaf water potential was monitored and compared to intact leaves. The results of these experiments and the usefulness of the detached leaf system are discussed.

• OSTI ID: 5514065
• Report Number(s): CONF-9107184--
• Conference Information: Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 96:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540210 -- Environment
Terrestrial-- Basic Studies-- (1990-)
551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
ABSCISIC ACID
AUXINS
BIOLOGICAL ACCUMULATION
BIOLOGICAL STRESS
CARBOXYLIC ACIDS
DROUGHTS
ENVIRONMENTAL EFFECTS
LEAVES
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MONOCARBOXYLIC ACIDS
OPENINGS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHASEOLUS
PHYSIOLOGY
PLANT GROWTH REGULATORS
PLANTS
STOMATA
TOLERANCE