Metabolic acclimation to hypoxia in winter cereals. Low temperature flooding increases adenylates and survival in ice encasement

Cold hardened seedlings of winter wheat (Triticum aestivum L. em Thell) show an hypoxic hardening response: an exposure to low temperature flooding increases the tolerance of plants to a subsequent ice encasement exposure. Seedlings of winter barley (Hordeum vulgare L.) do not show such a response i...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1989-11, Vol.91 (3), p.1063-1068
Main Authors: ANDREWS, C. J, POMEROY, M. K
Format: Article
Language:English
Subjects:
Acclimatization
adaptacion fisiologica
adaptation
Adaptation to environment and cultivation conditions
adenosindifosfato
adenosine diphosphate
adenosine triphosphate
adenosintrifosfato
Aerial parts
Agronomy. Soil science and plant productions
anoxia
anoxie
Barley
Biological and medical sciences
cold
cultivos de invierno
culture d' hiver
darkness
durcissement
echange d' energie
endurecimiento
energy exchange
energy metabolism
flooding
frio
froid
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
glace
hardening
hielo
hordeum vulgare
Hypoxia
Ice
inondation
intercambio de energia
inundacion
light
Low temperature
lumiere
luz
Metabolism
Metabolism. Physicochemical requirements
metabolisme energetique
metabolismo energetico
obscuridad
obscurite
Plant physiology and development
Plants
Seedlings
supervivencia
survie
survival
Thawing
triticum
triticum aestivum
Varietal selection. Specialized plant breeding, plant breeding aims
Wheat
winter crops
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Summary:Cold hardened seedlings of winter wheat (Triticum aestivum L. em Thell) show an hypoxic hardening response: an exposure to low temperature flooding increases the tolerance of plants to a subsequent ice encasement exposure. Seedlings of winter barley (Hordeum vulgare L.) do not show such a response in similar experimental conditions. During ice encasement, there are general declines in adenylate energy charge (AEC), total adenylates and ATP:ADP ratios in the crown tissues of two winter wheat cultivars, and a winter barley, but rates of decline are faster in the barley. When the ice period is preceded by low temperature flooding of the whole plant, levels of the adenylate components are raised significantly in the wheats, and to a lesser extent in the barley. The survival of plants in ice preceded by flooding is related to the increased initial level of adenylates at the onset of the ice encasement stress, and the maintenance of higher levels of adenylates and ATP in the early stages of ice encasement as a result of accelerated rates of glycolysis. Higher survival of both winter wheat and barley plants during ice encasement in the light is also associated with significantly higher levels of AEC and adenylates in the early stages of ice encasement.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.91.3.1063