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CULTIVARS

Registration of ‘Clearwater’ Low-Phytate Hulless Spring Barley

^a USDA-ARS, National Small Grains Germplasm Research Facility, 1691 S. 2700 W., Aberdeen, ID 83210
^b Univ. of Idaho Research and Extension Center, 1693 S. 2700 W, Aberdeen, ID 83210
^c Univ. of Idaho Research and Extension Center, Tetonia, ID 83436

^* Corresponding author (phil.bregitzer{at}ars.usda.gov).

ABSTRACT

‘Clearwater’ (Reg. No. CV-335; PI 647080) is a spring two-rowed barley (Hordeum vulgare L.) developed by the USDA-ARS and the Idaho Agricultural Experiment Station. Clearwater was selected and released on the basis of competitive agronomic performance in combination with low-phytate (LP), hulless grain. Clearwater derives from an BC₁F_3:4 selection from the cross ‘Baronesse’*2/Pmut640//HB317. It was tested under the experimental designation 01ID435H. The parent Pmut640 is a sodium-azide generated mutant induced in the two-rowed malting cultivar Harrington. The mutation conferring reduced phytate in Pmut640 is believed to be allelic to lpa2-1, which results in a reduction of phytate (myo-inositol 1,2,3,4,5,6-hexakisphosphate) of approximately 40 to 50% and an increase in inorganic P of greater than 400%. Studies have shown that these changes are associated with increased feed quality and reduced environmental impacts when fed to non-ruminant animals, based on increased P digestibility and reduced fecal P content.

Abbreviations: LP, low phytate • P_i, inorganic phosphorus • WRDSBN, Western Regional Dryland Spring Barley Nurseries • WRSBN, Western Regional Spring Barley Nurseries