Journal Article

Mobilization of Endosperm Reserves in Cereal Seeds under Anoxia

Pierdomenico Perata, Lorenzo Guglielminetti and Amedeo Alpi

in Annals of Botany

Published on behalf of Annals of Botany Company

Volume 79, issue suppl_1, pages 49-56
Published in print January 1997 | ISSN: 0305-7364
Published online January 1997 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/oxfordjournals.aob.a010306
Mobilization of Endosperm Reserves in Cereal Seeds under Anoxia

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  • Ecology and Conservation
  • Evolutionary Biology
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The great majority of seeds from higher plants fail to germinate under anoxic conditions. While the metabolic pathways operating during the aerobic process of seed germination are well described, there is only limited evidence concerning metabolic pathways operating under conditions of limited oxygen availability. This is despite the importance of carbohydrate availability for plant tolerance to anaerobic conditions.

We review and discuss carbohydrate metabolism in cereal seeds and seedlings subjected to anaerobic conditions. Analysis of recent results reveals that, among cereal seeds, only rice is able to degrade the starchy endosperm. This is achieved by the concerted action of the complete set of amylolytic enzymes. In anoxic wheat and barley seeds, the enzymes involved in starch degradation are either absent or present as inactive forms. Differences are also observed in the metabolism of soluble carbohydrates and in status of related enzymes, with rice showing anoxia-enhanced activities of sucrose synthase, fructokinase. glucose-6P dehydrogenase, and nucleoside diphosphate kinase. The possible occurrence of a sucrose synthase pathway for sucrose utilization under anoxia is discussed.

Keywords: Hordeum vulgare L.; Oryza sativa L.; Triticum aestivum L.; anoxia; barley; carbohydrate metabolism; fermentative metabolism; rice; wheat

Journal Article.  0 words. 

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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