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REGISTRATIONS OF CULTIVARS

Registration of ‘Pirogue’ Rice

Rice Research Station, 1373 Caffey Road, Rayne, LA 70578

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

‘Pirogue’ (Oryza sativa L.) (Reg. no. CV-118, PI 634544) is the first high-yielding, early maturing, short stature, short-grain rice cultivar for the production in the southern USA. It was developed at the Rice Research Station, Crowley, LA, by the Louisiana State University Agricultural Center (LSU AgCenter) in cooperation with the USDA-ARS, the Arkansas Agricultural Experiment Station, the Mississippi Agricultural and Forestry Experiment Station, the Florida Agricultural Experiment Station, and the Texas Agricultural Experiment Station. Pirogue was officially released by LSU AgCenter in 2003.

Pirogue was developed from the cross ‘Rico 1’/‘S-101’ made at the Rice Research Station in 1990 (90CR159). Rico 1 is a high-yielding, midseason, conventional height medium-grain cultivar released by the USDA-ARS in conjunction with the Texas A&M University Agricultural Research and Extension Center, Beaumont, TX (Bollich et al., 1990). S-101 is a semidwarf, very early, short-grain rice cultivar released by the Rice Experiment Station in Biggs, CA (Johnson et al., 1989).

Pirogue originated as a bulk of F₅ seeds of panicle row 9435564 in 1994. Initially, it was tested in the preliminary yield trials (PY) in Crowley, LA, as entry PY678, in 1995. After three consecutive generations of purification and reselection in Puerto Rico and at Crowley from 1996 to 1997, it was tested again as entry PY765 in 1998 and advanced to the Cooperative Uniform Regional Rice Nurseries (URRN) in 1999 with the designation of RU9902134. The line was also evaluated in the Louisiana Commercial Advanced tests during 1999 through 2002.

The average plant height of Pirogue in 35 trials is 102 cm compared with 95 cm for Bengal and 105 for Earl. Even though Pirogue is taller than Bengal, it has a better lodging resistance than Bengal. In 37 trials, the average number of days from emergence to 50% heading for Pirogue is 83 d compared with 85 d for Bengal and 83 d for Earl.

Pirogue has an excellent grain yield and good milling yield. In 39 statewide and regional trials during 1999 through 2002, average grain yield of Pirogue was 8597 kg ha^–1 at 120 g kg^–1 moisture compared with 8674 and 8280 kg ha^–1 for Bengal and Earl, respectively. In 14 state and regional tests (1999–2002), average ratoon yield for Pirogue is 1039 kg ha^–1 at 120 g kg^–1 moisture compared with 1773 and 1463 kg ha^–1 for Bengal and Earl, respectively. Average milling yields (mg g^–1 whole milled kernels: mg g^–1 total milled rice) at 120 g kg^–1 moisture in 27 state and regional tests from 1999 through 2002 were 610:688 for Pirogue, 630:700 for Bengal, and 591:695 for Earl.

A comparison of kernel dimensions of Pirogue with other commercial medium-grain varieties indicates that it has a short grain type (Table 1). Average apparent amylose content of Pirogue is 143 g kg^–1 compared with 120 and 128 g kg^–1 for Bengal and Earl, respectively. Pirogue has a low gelatinization temperature (64–68°C), as indicated by an average alkali (17 g kg^–1 KOH) spreading value of 6. These results indicate that Pirogue has typical U.S. short-grain rice cooking characteristics as described by Webb (1991).

Pirogue is moderately resistant to sheath blight (caused by Rhizoctonia solani Kühn), rating a 4.7 on a disease scale of 0 = immune, 9 = highly susceptible in 10 inoculated tests from 2000 through 2002, compared with 5.2 for Bengal. Results from greenhouse evaluations for leaf blast [caused by Pyricularia grisea (Cooke) Sacc.] indicated that Pirogue is resistant to race IB-54 but moderately susceptible to susceptible to races IC-17, IB-49, IG-1, and IE-1K. However, results from five field evaluations conducted in Louisiana and Arkansas from 2000-2002 indicate that Pirogue is resistant to rottenneck blast (caused by Pyricularia grisea Sacc. = P. oryzae Cavara), rating a 0.7 on a disease scale of 0 = immune, 9 = highly susceptible compared with 3.5 for Bengal. Pirogue appears to be highly resistant to the physiological disorder straighthead, rating a 1.1 on a disease scale of 0 = immune, 9 = highly susceptible, compared with 4.0 for Bengal. Pirogue is also resistant to leaf smut (caused by Entyloma oryzae Syd. & P. Syd.) and narrow brown leaf spot [caused by Cercospora janseana (Racib.) O. Const.], rating a 1.9 and 0.7, respectively, compared with a 2.9 and 0.8 for Bengal, respectively.

Off-types observed and removed from increase fields of Pirogue included any combination of the following: taller, shorter, pubescent, earlier, later, gold-hull, and intermediate grain shape. The total number of off-types was less than 1 per 5000 plants.

Breeder and Foundation seed of Pirogue will be maintained by the Louisiana State University Agricultural Center, Louisiana Agricultural Experiment Station, Rice Research Station, 1373 Caffey Road, Rayne, LA 70578. Limited quantities of seed are available upon request to the corresponding author.

NOTES

Research supported in part by the Louisiana Rice Research Board. Approved for publication by the Director of the Louisiana Agric. Exp. Stn. as manuscript no. 04-61-0049. Registration by CSSA.

Accepted for publication April 30, 2004.

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]
• Johnson, C.W., H.L. Carnahan, S.T. Tseng, J.J. Oster, J.E. Hill, J.N. Rutger, and D.M. Brandon. 1989. Registration of S-101 rice. Crop Sci. 29:1090.[Free Full Text]
• Webb, B.D. 1991. Rice quality and grades. p. 89–119. In B.S. Luh (ed.) Rice—Utilization. 2nd ed. Van Nostrand Reinhold, New York.

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