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Type: Journal article
Title: Genetic, hormonal, and physiological analysis of late maturity α-amylase in wheat
Other Titles: Genetic, hormonal, and physiological analysis of late maturity alpha-amylase in wheat
Author: Barrero, J.
Mrva, K.
Talbot, M.
White, R.
Taylor, J.
Gubler, F.
Mares, D.
Citation: Plant Physiology, 2013; 161(3):1265-1277
Publisher: Amer Soc Plant Physiologists
Issue Date: 2013
ISSN: 0032-0889
Statement of
Jose M. Barrero, Kolumbina Mrva, Mark J. Talbot, Rosemary G. White, Jennifer Taylor, Frank Gubler, and Daryl J. Mares
Abstract: Late maturity α-amylase (LMA) is a genetic defect that is commonly found in bread wheat (Triticum aestivum) cultivars and can result in commercially unacceptably high levels of α-amylase in harvest-ripe grain in the absence of rain or preharvest sprouting. This defect represents a serious problem for wheat farmers, and apart from the circumstantial evidence that gibberellins are somehow involved in the expression of LMA, the mechanisms or genes underlying LMA are unknown. In this work, we use a doubled haploid population segregating for constitutive LMA to physiologically analyze the appearance of LMA during grain development and to profile the transcriptomic and hormonal changes associated with this phenomenon. Our results show that LMA is a consequence of a very narrow and transitory peak of expression of genes encoding high-isoelectric point α-amylase during grain development and that the LMA phenotype seems to be a partial or incomplete gibberellin response emerging from a strongly altered hormonal environment.
Keywords: Triticum; Seeds; Abscisic Acid; Gibberellins; Plant Growth Regulators; Oligonucleotide Array Sequence Analysis; Gene Expression Regulation, Plant; Up-Regulation; Genotype; Quantitative Trait, Heritable; Genes, Plant; Isoelectric Point; alpha-Amylases; Endosperm
Rights: © 2013 American Society of Plant Biologists. All Rights Reserved.
RMID: 0020125796
DOI: 10.1104/pp.112.209502
Appears in Collections:Agriculture, Food and Wine publications

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