Endosperm and starch granule morphology in wild cereal relatives

Lee, Leonard Slade, Shapter, Frances, & Henry, Robert (2008) Endosperm and starch granule morphology in wild cereal relatives. Plant Genetic Resources, 6(2), pp. 85-97.

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Abstract

Australia's native grass species contain a diverse array of wild cereal relatives which are adapted to a broader range of environmental conditions than current commercial cereals and may contain novel alleles which have utility in commercial production systems. Characterizing the available variation in endosperm morphology is one of the first steps towards in planta manipulation of endosperm by either the introgression of novel alleles or bioengineering cereal starch and protein. The endosperm of 19 crop wild relatives (CWR) was examined using scanning electron microscopy (SEM). Mature caryopses were fixed, dehydrated, critical-point dried and then snap fractured transversely through the grain. Wild relatives exhibited similar types of starch granules to that of their respective cultivated species, though in general the wild species retained a greater proportion of the endosperm cell wall at maturity. The two species examined with no closely related cultivated species exhibited a rice-like endosperm. Wild sorghum relatives exhibited an abundance of endosperm variations described as variations in starch granule size, shape and surface morphology, and the distribution of protein bodies. This is particularly important because the grain of Sorghum bicolor has inherently low starch and protein digestibility. These variations within the wild relatives of commercial cereals may provide novel sources of genetic diversity for future grain improvement programmes.

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ID Code: 16964
Item Type: Journal Article
Refereed: Yes
Keywords: Cereal, Endosperm, Grain, Protein Bodies, Scanning Electron Microscopy, Sorghum, Starch Granule, Wild Crop Relatives
DOI: 10.1017/S1479262108986512
ISSN: 1479-2621
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 [please consult the authors]
Deposited On: 16 Dec 2008 23:10
Last Modified: 29 Feb 2012 13:42

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