Pre-maturity α-amylase in wheat: The role of abscisic acid and gibberellins. (May 2015)

• Record Type: Journal Article
• Authors: Kondhare, K.R.; Farrell, A.D.; Kettlewell, P.S.; Hedden, P.; Monaghan, J.M.
• Is Part Of: Journal of cereal science. Volume 63(2015)
• Page Start: 95
• Page End: 108
• Publication Date: 2015-05
• Subjects: Abscisic acid -- Gibberellins -- Pre-maturity α-amylase -- Wheat grain; ABA abscisic acid -- ABREs ABA-responsive elements -- CaM calmodulin -- DAA days after anthesis -- DELLA growth repressor -- DPA dihydrophaseic acid -- GAs gibberellins -- GAi gibberellin-insensitive -- GAMYB transcription factor for α-amylase promoter -- GGPP trans-geranylgeranyldiphosphate -- GID1 GA-INSENSITIVE DWARF1 -- GA3 gibberellic acid (active GA produced by one branch of the biosynthetic pathway) -- HFN Hagberg Falling Number -- IPP isopentenyl diphosphate -- PA phaseic acid -- PB paclobutrazol -- pI isoelectric point -- PKABA1 ABA-inducible Ser/Thr protein kinase 1 -- PMA pre-maturity α-amylase -- PP2C Group-A protein phosphatases 2C -- PYL/PYR/RCAR nuclear ABA receptor -- QTL quantitative trait locus -- RH relative humidity -- Rht reduced height genes -- SnRK2 sucrose nonfermenting1-related protein kinases 2 -- UK United Kingdom -- USA United States of America -- 1B/1R wheat-rye chromosome translocation where the short arm of the 1B chromosome in wheat is replaced by the short arm of the 1R chromosome from rye; Grain -- Periodicals; Cereal products -- Periodicals; Céréales -- Périodiques; Produits céréaliers -- Périodiques; Cereal products; Grain; Periodicals; 664.705
• DOI: 10.1016/j.jcs.2015.03.004
• Languages: English
• ISSNs: 0733-5210

Abstract

Abstract: The occurrence of pre-maturity α-amylase (PMA) is a major cause of poor bread-making quality (low Hagberg Falling Number) in wheat grain. In susceptible genotypes, it involves the excessive accumulation of high isoelectric point (pI) α-amylase in mature grain prior to germination and in the absence of pre-harvest sprouting. Several factors regulate PMA formation in developing grain, including genotype, agronomy, and environmental conditions. In particular, a cold period during mid-grain development has been found to be a major stimulus for PMA induction. Although the factors affecting the PMA occurrence are well known, little is known about the molecular mechanism governing its induction. The plant hormones abscisic acid (ABA) and gibberellins (GAs) influence various aspects of grain development, and it has been suggested that PMA involves changes in the amount of these hormones or the sensitivity of the grain to these hormones. This review summarizes recent studies investigating the role of ABA and GAs in PMA induction and PMA occurrence. Highlights: PMA formation in wheat grains is a major cause of poor bread-making quality. A cold period during mid-grain development is a major stimulus for PMA induction. ABA and GAs influence various aspects of grain development. It was suggested that PMA involves changes in ABA/GA levels or the sensitivity. Recent studies show that both GA levels and GA-sensitivity are associated with PMA.