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REGISTRATIONS OF GERMPLASMS

Registration of ‘FL-SYNT’ Tetraploid Spring Rye Germplasm

^a North Florida Res. Education Center, Quincy, FL 32351
^b Agronomy Dep., Box 110500, Univ. of Florida, Gainesville, FL 32611-0500
^c Univ. of Georgia, Griffin, GA 30223-1197

^* Corresponding author (rdbarnett{at}ifas.ufl.edu)

FL-SYNT tetraploid spring rye (Secale cereale L.) germplasm (Reg. no. GP-5, PI 613196) was developed by the University of Florida Agricultural Experiment Station as a unique artificially-induced tetraploid population. Its seed yield and forage production is equivalent to diploid rye cultivars used for seed or grain production in southern USA. The FL-SYNT germplasm should be useful as a parental stock for developing polyploidy rye populations for grain or forage production for southern environments.

This spring germplasm was derived by interpollinating five autotetraploid populations derived from the five diploid spring cultivars ‘Florida Black’, ‘Gator’, ‘Explorer’ (Wells, 1966), ‘Wrens Abruzzi’ (Morey, 1970), and ‘Elbon’ by chromosome doubling with colchicine (Lacadena and Villena, 1967). Following interpollination, 15 cycles of phenotypic recurrent selection were used in the development of this germplasm line. In each cycle, more than 2000 spaced plants were evaluated. Individual plant selection was based on forage production, grain yield, and test weight. A trial comparing FL-SYNT with several diploid ryes (‘Florida 401’ [Pfahler et al., 1986], Florida Black, and Gator) and a tetraploid winter rye, ‘Wheeler’, was conducted during a 2-yr (1979–1980 and 1980–1981) period at two locations in Florida: the North Florida Research and Education Center, Quincy, and the Agronomy Farm, Gainesville (Pfahler et al., 1982, 1983, 1984). Forage yield of FL-SYNT (929 kg ha^–1) was not significantly (P > 0.05) greater than Florida Black (867 kg ha^–1), Gator (897 kg ha^–1), or Florida 401 (857 kg ha^–1), but was significantly (P < 0.05) less than Wheeler (1463 kg ha^–1), a winter rye cultivar that usually remains vegetative when grown in Florida (Pfahler et al., 1982). The in vitro dry matter disappearance (IVOMD) value of FL-SYNT averaged across all clipping dates in a 2-yr study was 78%, while the IVOMD values of the diploid cultivars Florida 401, Gator, and Florida Black were 75, 75, and 74%, respectively (Pfahler et al., 1983). Wheeler had 79% IVOMD. The percentage crude protein (CP) was greatly influenced by the environment (Pfahler et al., 1984). During this 2-yr study, FL-SYNT averaged 23% CP, compared with 22, 23, and 22% for Florida 401, Gator, and Florida Black, respectively. The percentage CP for Wheeler averaged slightly higher, 25%, because of the fact that it remained vegetative throughout the season. Because Wheeler remained vegetative, its CP did not decline as quickly in later clippings, as was found with diploid cultivars tested in the study (Pfahler et al., 1984).

FL-SYNT rye is similar in height to Gator, but has larger and heavier seed, and wide leaves, similar to Wheeler. FL-SYNT rye normally flowers from 25 February to 25 March, depending on year and location. This germplasm was tested experimentally as FL-SYNT, but was not released as a cultivar by the University of Florida Agricultural Experiment Station because its grain yield and test weight were not substantially higher than those of commercially available diploid rye cultivars (Pfahler et al., 1985).

Small quantities of seed for research and breeding purposes may be obtained from the corresponding author for at least 5 yr from the date of this publication. Recipients of the seed are asked to make appropriate recognition of the source of FL-SYNT rye if it is used in the development of a new cultivar, germplasm, parental line, or genetic stock.

ACKNOWLEDGMENTS

Appreciation is expressed to Dr. D.D. Morey for supplying the seeds of the five tetraploid populations.

NOTES

Contribution of the Florida Agric. Exp. Stn. as Journal Series no. R-08736. Registration by CSSA.

Accepted for publication February 29, 2004.

REFERENCES

• Lacadena, J.R., and L. Villena. 1967. Tetraploid synthetic varieties of rye. An. Aula Dei 8:197–256.
• Morey, D.D. 1970. Registration of ‘Wrens Abruzzi’ rye. Crop Sci. 10:209.[Free Full Text]
• Pfahler, P.L., R.D. Barnett, and H.H. Luke. 1982. Seasonal distribution of rye forage production in Florida as affected by population, seeding rate, location, and year. Soil Crop Sci. Soc. Fla. Proc. 41:62–67.
• Pfahler, P.L., R.D. Barnett, and H.H. Luke. 1983. Genetic, developmental, and environmental effects on rye forage digestibility in Florida. Soil Crop Sci. Soc. Fla. Proc. 42:75–79.
• Pfahler, P.L., R.D. Barnett, and H.H. Luke. 1984. Genetic, developmental, and seasonal effects on rye forage protein content and production in Florida. Soil Crop Sci. Soc. Fla. Proc. 43:145–149.
• Pfahler, P.L., R.D. Barnett, and H.H. Luke. 1985. Genetic and environmental effects on rye grain production in Florida. Soil Crop Sci. Soc. Fla. Proc. 44:167–170.
• Pfahler, P.L., R.D. Barnett, and H.H. Luke. 1986. Registration of ‘Florida 401’ rye. Crop Sci. 26:836.[Free Full Text]
• Wells, D.G. 1966. Registration of ‘Explorer’ rye. Crop Sci. 6:501.[Free Full Text]

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