Journal
ANNALS OF BOTANY
Volume 91, Issue 2, Pages 119-127Publisher
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcf210
Keywords
review; maize (Zea mays L.); anoxia; signal transduction; calcium; ionic homeostasis; glutamate decarboxylase; aerenchyma; XET; root tip death; sucrose synthase; protease; flooding tolerance
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Anaerobic treatment dramatically alters the patterns of gene expression in maize (Zea mays L.) seedlings. During anaerobiosis there is an immediate repression of pre-existing protein synthesis, with the concurrent initiation of a selective synthesis of approx. 20 proteins. Among these anaerobic proteins are enzymes involved in glycolysis and related processes. However, inducible genes that have different functions were also found; these may function in other, perhaps more long-term, processes of adaptations to flooding, such as aerenchyma formation and root-tip death. In this article we review our recent work on maize responses to flooding stress, which has addressed two questions: how are these gene expression changes initiated and how do they lead to adaptation to flooding stress? Our results indicate that an early rise in cytosolic Ca2+, as well as a quick establishment of ionic homeostasis, may be essential for the induction of adaptive changes at the cellular as well as organismal level. (C) 2003 Annals of Botany Company.
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