Influence of chilling and drought on water relations and abscisic acid accumulation in bean

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Australian Journal of Plant Physiology; (Australia)

DOI:https://doi.org/10.1071/PP9910025· OSTI ID:5999807

Vernieri, P; Pardossi, A; Tognoni, F ^[1]

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1. Universita degli Studi di Pisa (Italy)

Intact bean seedlings were subjected to either chilling (4{degree}C) or drought stress. Leaf water relations and abscisic acid (ABA) content were monitored throughout a stress-recovery cycle. Chilling at low relative humidity (RH) and drought caused similar water deficits, as indicated by the decline in relative water content and water potentials, but they had different effects on ABA accumulation. There was a rapid increase in ABA levels in the leaves of water-deprived plants while only slight ABA accumulation was observed after 48 h of chilling (4{degree}C). After 24 h cold treatment there were large changes in turgor but no change in ABA content. Plants chilled for 24 h accumulated ABA only when transferred to recovery conditions (20{degree}C, 90-95% RH, in the dark) to an extent that was related to the rate of leaf rehydration. When the chilling treatment was performed in a water-saturated atmosphere, plants did not suffer any water stress and ABA levels did not increase over a period of 48 h. However, when the chilling treatment lasted for a longer period (72 h), a significant increase in ABA levels was found also in the absence of water deficit. Experiments performed with leaf discs incubated in a mannitol solution (osmotic potential {minus}1{center dot}6 MPa) at different temperatures indicated that low temperature markedly inhibits ABA synthesis and that water stress induces increases in ABA content only at non-limiting warm temperatures.

• OSTI ID: 5999807
• Journal Information: Australian Journal of Plant Physiology; (Australia), Vol. 18:1; ISSN 0310-7841
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
60 APPLIED LIFE SCIENCES
09 BIOMASS FUELS
54 ENVIRONMENTAL SCIENCES
ABSCISIC ACID
BIOLOGICAL FUNCTIONS
DROUGHTS
BIOLOGICAL EFFECTS
PLANTS
TEMPERATURE EFFECTS
BEANS
BIOLOGICAL STRESS
MAPLES
MOISTURE
OAKS
POPLARS
SEEDLINGS
SYCAMORES
AUXINS
CARBOXYLIC ACIDS
FOOD
FUNCTIONS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANT GROWTH REGULATORS
TREES
VEGETABLES
551000* - Physiological Systems
553000 - Agriculture & Food Technology
090700 - Biomass Fuels- Resources- (1990-)
540220 - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)