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REGISTRATIONS OF GERMPLASMS

Registration of Goldhull Low Phytic Acid (GLPA) Germplasm of Rice

^a USDA-ARS, P.O. Box 1090, Stuttgart, AR 72160
^b University of Arkansas, Rice Research and Extension Center, P.O. Box 351, Stuttgart, AR 72160

^* Corresponding author (jnrutger{at}spa.ars.usda.gov)

The ARS, USDA, and the Arkansas Agricultural Experiment Station released goldhull low phytic acid (GLPA) (Reg. no. GP-93, PI 632954) germplasm of rice (Oryza sativa L.) in February 2003. GLPA was produced by hybridizing the low phytic acid mutant (KBNT lpa1-1) (Rutger et al., 2004) of ‘Kaybonnet’ (Gravois et al., 1995) with the goldhull color cultivar ‘Bluebelle’ (Bollich et al., 1968), followed by selection for recombinants possessing the recessive gene lpa1-1 from the first parent and the recessive gene for goldhull (gh) color from the second parent. While the original low phytic acid mutant KBNT lpa1-1 was phenotypically indistinguishable from the original parent, GLPA germplasm is marked by goldhull color, enabling identity preservation of the line in the field, in the farm truck, and in the elevator.

The lpa1-1 gene reduces the phytic acid portion of seed phosphorus from 71 to 39%, with a concomitant increase in inorganic phosphorus of 5 to 32%, with little effect on total seed P (Larson et al., 2000). This is considered important because phytic acid P is poorly digested by humans and non-ruminant livestock, and also may interfere with nutritional uptake of iron, calcium, and zinc. The gh gene was used in several U.S. cultivars through the 1960s, but eventually was phased out as parboiling became popular, because some of the goldhull cover penetrated into and discolored the parboiled white rice. Since most of the phytic acid is in the bran portion of the rice grain, the most likely use of low phytic acid rice will be for the brown rice market. It is not anticipated that any goldhull color diffusion from parboiling will be of concern in brown rice.

GLPA was constituted by bulking eight F₈ generation lines that were uniform for goldhull color, low phytic acid, maturity, and height. Like both parents, GLPA is long grain, has glabrous hulls, and tall plant type.

In a preliminary small-plot test at Stuttgart AR, in 2002, GLPA, KBNT lpa1-1, and KBNT averaged 6800, 6600, and 6900 kg ha^–1, respectively. All three were similar in height, approximately 118 cm, and maturity, flowering 105 to 107 d after planting. Brown rice grain dimensions of all three were similar. Amylose contents of all three also were similar, 229 to 235 g kg^–1, as were the intermediate alkali spreading values.

Germplasm amounts of seed (5 g) of GLPA may be obtained by writing to J. Neil Rutger, Dale Bumpers National Rice Research Center, USDA-ARS, P.O. Box 1090, Stuttgart, AR 72160. Seed also will be placed in the National Small Grains Collection, USDA-ARS, 1691 South 2700 West, Aberdeen, ID 83210, where it is available for research purposes, including development and commercialization of new cultivars. If this germplasm contributes to the development of new cultivars, it is requested that appropriate recognition be given to the source.

NOTES

Registration by CSSA.

Accepted for publication December 31, 2003.

REFERENCES

• Bollich, C.N., J.E. Scott, B.D. Webb, and J.G. Atkins. 1968. Registration of Bluebelle rice. Crop Sci. 8:399–400.[Free Full Text]
• Gravois, K.A., K.A.K. Moldenhauer, F.N. Lee, R.J. Norman, R.S. Helms, J.L. Bernhardt, B.R. Wells, R.H. Dilday, P.C. Rohman, and M.M. Blocker. 1995. Registration of ‘Kaybonnet’ rice. Crop Sci. 34:587–588.
• Larson, S.R., J.N. Rutger, K.A. Young, and V. Raboy. 2000. Isolation and genetic mapping a non-lethal rice (Oryza sativa L.) low phytic acid 1 mutation. Crop Sci. 40:1397–1405.[Abstract/Free Full Text]
• Rutger, J.N., V. Raboy, K.A.K. Moldenhauer, R.J. Bryant, F.N. Lee, and J.W. Gibbons. 2004. Registration of KBNT lpa1–1 low phytic acid germplasm of rice. Crop Sci. 44:363.[Free Full Text]

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