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REGISTRATIONS OF CULTIVARS

Registration of ‘Earl’ Rice

^a Rice Res. Stn., P.O. Box 1429, Crowley, LA 70527-1429
^b Idlewild Res. Stn., P.O. Box 985, Clinton, LA 70722-0985

* Corresponding author (slinscombe{at}agctr.lsu.edu)

‘Earl’ rice (Oryza sativa L.) (Reg. no. CV-112, PI 614900) is an early maturing, high yielding, medium-grain cultivar developed at the Rice Research Station at Crowley, LA, by the Louisiana State University Agricultural Center in cooperation with the USDA-ARS, the Arkansas Agricultural Experiment Station, the Mississippi Agricultural and Forestry Experiment Station, and the Texas Agricultural Experiment Station. Earl was officially released 1 Mar. 2000.

Earl originated from the cross ‘Mercury’/‘Rico 1’//‘Bengal’ made at the Rice Research Station in 1991. Mercury is a high yielding, early maturing, semidwarf medium-grain cultivar released by the Rice Research Station in 1987 (McKenzie et al., 1988). Rico 1 is high yielding, midseason, conventional height medium grain released by the USDA-ARS and the Texas Agricultural Experiment Station in 1987 (Bollich et al., 1990). Bengal is an early maturing, semidwarf medium grain developed and released by the Rice Research Station in 1992 (Linscombe et al., 1993). The selection number of Earl was 9431618. It was entered into the preliminary yield nursery (experimental designation 9502172) as an F₄ bulk in 1995. Earl was entered into the Louisiana Commercial-Advanced Yield tests and the Uniform Regional Rice Nurseries (URRN) in 1996 with the designation RU9602074.

Earl has conventional plant height and is susceptible to lodging. In the URRN grown in Louisiana, Arkansas, Mississippi, and Texas from 1997–1999, the average height of Earl was 107 cm and that of Bengal was 99 cm. The average number of days from emergence to 50% heading (URRN 1997–1999) was 84 and 83 for Earl and Bengal, respectively. The flag leaf of Earl averages 32 cm in length and is normally dark green in color and glabrous. Slight pubescence may be found on the lemma keel. Kernels have straw-colored hulls and apiculi. The average grain yield of Earl in the URRN in the four major rice producing states in the southern USA from 1997 to 1999 was 8457 kg ha^-1 compared with 8639 kg ha^-1 for Bengal. In the Louisiana Commercial-Advanced Yield tests conducted in 19 environments between 1997 and 1999, Earl produced an average yield of 9368 kg ha^-1 compared with 8684 kg ha^-1 for Bengal. Milling yield averages (mg g^-1 whole kernel: mg g^-1 total milled rice) at 120 mg g^-1 moisture from the URRN (1997–1999) were 556:703 (56:71%) for Earl and 603:713 (60:71%) for Bengal. Milling yield averages in the Louisiana Commercial-Advanced Yield tests (14 environments) from 1997–1999 were 603:714 (60:71%) for Earl and 629:719 (63:72%) for Bengal. Individual kernel dimensions for Earl and Bengal are shown in Table 1.

Earl is moderately susceptible to the blast fungus [caused by Pyricularia grisea (Cooke) Sacc.] races IB-1 and IB-49 and moderately resistant to races IB-45, IB-54, IC-17, IE-1, IG-1, and IH-1. Earl is moderately resistant to sheath blight (caused by Rhizoctonia solani Kuhn), resistant to narrow brown leaf spot (Cercospora oryzae Miyake), moderately resistant to leaf smut (caused by Entyloma oryzae Syd. & P. Syd.), and moderately susceptible to the physiological disorder straighthead.

Variants observed and removed from increase fields of Earl included any combination of the following: taller, shorter, pubescent, awned, long grain, short grain, earlier, later, and gold hull. The total number of variants was fewer than 1 per 5,000 plants.

U.S. Plant Variety Protection of Earl has been applied for. Breeder and Foundation seed of Earl will be maintained by the Louisiana State University Agricultural Center, Louisiana Agricultural Experiment Station, Rice Research Station, P.O. Box 1429, Crowley, LA 70527-1429. Limited quantities of seed are available upon request to the corresponding author.

NOTES

Research supported in part by the Louisiana Rice Research Board. Registration by CSSA.

Accepted for publication April 30, 2001.

REFERENCES

• Bollich, C.N., B.D. Webb, M.A. Marchetti, and J.E. Scott. 1990. Registration of ‘Rico 1’ rice. Crop Sci. 30:1161.[Free Full Text]
• McKenzie, K.S., P.K. Bollich, D.E. Groth, F. Jodari, J.F. Robinson, and J.N. Rutger. 1988. Registration of ‘Mercury’ rice. Crop Sci. 28:193–194.[Free Full Text]
• Linscombe, S.D., F. Jodari, K.S. McKenzie, P.K. Bollich, L.M. White, D.E. Groth, and R.T. Dunand. 1993. Registration of ‘Bengal’ rice. Crop Sci. 33:645–646.[Free Full Text]
• Webb, B.D., C.N. Bollich, H.L. Carnahan, K.A. Kuenzel, and K.S. McKenzie. 1985. Utilization characteristics and qualities of United States rice. p. 25–35. In Rice grain quality and marketing. IRRI, Manila, Philippines.

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