Submitted to: Journal of Plant Registrations
Publication Type: Germplasm Registration
Publication Acceptance Date: May 1, 2010
Publication Date: August 1, 2010
Citation: Bregitzer, P.P., Raboy, V., Obert, D.E. 2010. Registration of LP1-2581, LP1-2163H, LP3-1159, and LP640-1304 low phytate spring barley germplasm lines. Journal of Plant Registrations. 4:228-231. Interpretive Summary: Barley grain—like other cereal grains and legume seeds—stores phosphorus in a form (called phytate) that can’t be digested by non-ruminant animals (like pigs) and humans, causing the phosphorus to be released unused into the environment where it becomes a water pollution problem. Phytate also ties up certain mineral nutrients and prevents them from being absorbed, which can lead to mineral deficiences in populations that consume diets made primarily of cereal grains or legumes. Both the environmental and nutritional problems caused by phytate can be prevented by making genetic changes that drastically reduce the amount of phytate and increase the amount of available phosphorus. As part of the process of developing useful barley varieties that are improved for phosphorus availability, the Agricultural Research Service, U.S. Dept. of Agriculture (USDA-ARS) has developed and released four low-phytate spring barley germplasm lines: LP1-2581, LP1-2163H, LP3-1159, and LP640-1304. These lines will enhance phosphorus and mineral nutrition and reduce phosphorus release into the environment, and may be useful for the production of future low phytate varieties or for genetic and biochemical studies.
Technical Abstract: The Agricultural Research Service, U.S. Dept. of Agriculture (USDA-ARS) has developed and released four low-phytate spring barley (Hordeum vulgare L.) germplasm lines: LP1-2581 (Reg. No._____, PI 658245), LP1-2163H (Reg. No._____, PI 658248 ), LP3-1159 (Reg. No._____, PI 658247), and LP640-1304 (Reg. No._____, PI 658246). The low phytate trait derives from sodium azide-induced mutations. In these lines, phytate—the primary form of phosphorus in grain—is significantly reduced, and inorganic phosphorus is increased. Total phosphorus is unchanged or reduced slightly. Phytate cannot be digested by monogastric animals, and is an effective chelator of nutritionally important minerals. Low phytate barley has been associated with increased phosphorus and mineral nutrition and reduced phosphorus excretion when fed to monogastric animals. Each of these lines represents a unique combination of genetic background and low phytate allele. Each mutant allele represents a mutation at a different locus. These lines may be useful for the production of future low phytate cultivars or for genetic and biochemical studies.