BRS 183 Soybean

BRS 183 is an early maturing soybean cultivar developed by Embrapa Soybean for sowing in Parana State. It flowers and reaches maturity 53 and 118 days after germination and yields 3,038 kg/ha. BRS 183 is resistant to stem canker, frog-eye leaf spot, bacterial pustule and moderately resistant to powdery mildew.


INTRODUCTION
BRS 183 is a soybean (Glycine max [L.] Merrill) cultivar developed by the Soybean National Research Center of the Brazilian Corporation for Agriculture Research (Embrapa Soybean).It is an early maturing cultivar released for sowing in Parana State after field yield tests in the 1996/97, 1997/98 and 1998/99 seasons, under the inbred line denomination BR94-4150 (Embrapa, 1999).It was submitted to the National Service for Cultivar Protection of the Ministry of Agriculture for registration and protection.

Pedigree and Breeding Methods
BRS 183 originated from a single plant selection in the F 4 SSD population obtained from the backcross Embrapa 1 (3) x IAC-12 (Figure 1).It was tested in 24 environments formed by three growing seasons and five to 11 location per season (Alliprandini et al., 1994).
The breeders seed was obtained using a twogeneration progeny selection.A initial sample of 300 plants was taken from the experimental material and sowed individually in four-meter rows.Off-type rows (plant and seed characteristics) were screened out and the remaining material was sown in a identity preserving fashion in four to five row blocks during the following season.Seeds from the homogeneous blocks (plant and seeds characteristics) were combined in a single stock to form the breeders seed (Toledo et al., 1994).

Performance
BRS 183 is an early maturing cultivar that yielded an average of 3,038kg/ha in the 24 test environments.This yield was 2.5% and 5.6% higher than that of IAS 5 and FT-Guaíra, respectively, which were used as controls (   (Kiihl and Garcia, 1989).
The average plant height and 100 seeds weight is 73cm and 15.6g, respectively.The oil and protein percentual contents are 18.6% and 38.7%, respectively (Miranda et al., 1998).BRS 183 shows white flowers, gray pubescence, dark brown pods, shiny yellow seed coat and positive reaction to peroxidase.It is resistant to stem canker, frog-eye leaf spot, bacterial pustule and moderately resistant to powdery mildew (Yorinori, 1994).

Pedigree and Breeding Method
BRS 184 originated from a single plant selection in the F 4 SSD population obtained from the cross FT-Guaíra x IAC-13-C (Figure 1).It was tested in 24 environments formed by three growing seasons and five to 11 location per season (Alliprandini et al., 1994).
The breeders seed was obtained using a twogeneration progeny selection.A initial sample of 300 plants was taken from the experimental material and sowed individually in four-meter rows.
Off-type rows (plant and seed characteristics) were screened out and the remaining material was sown in a identity preserving fashion in four to five row blocks during the following season.Seeds from the homogeneous blocks (plant and seeds characteristics) were combined in a single stock to form the breeders seed (Toledo et al., 1994).

Performance
BRS 184 reached maturity 121 days after germination and yielded an average of 3,210 kg/ ha in the 24 test environments.This performance was 20.% and 6.7% superior than that of BR-16 in the last two years and OCEPAR 13 in the last year, respectively, which were used as controls (Table 1).Its superiority is expressed in all regions of the Parana State.
The average plant height and 100 seeds weight is 83cm and 16.4g, respectively.The oil and protein percentual contents are 20.8% and 38.0%, respectively (Miranda et al., 1998).BRS 184 shows purple flowers, brown pubescence, light brown pods, moderately shiny yellow seed coat and negative reaction to peroxidase.It is resistant to frog-eye leaf spot, bacterial pustule and moderately resistant to powdery mildew (Yorinori, 1994).-11861 (Embrapa, 1999).It was submitted to the National Service for Cultivar Protection of the Ministry of Agriculture for registration and protection.

Pedigree and Breeding Method
BRS 185 originated from a single plant selection in the F 4 SSD population obtained from the cross FT-Abyara x IAC-13-B Figuare 1).It was tested in 24 environments formed by three growing seasons and five to 11 location per season (Alliprandini et al., 1994).
The breeders seed was obtained using a twogeneration progeny selection.A initial sample of 300 plants was taken from the experimental material and sowed individually in four-meter rows.
Off-type rows (plant and seed characteristics) were screened out and the remaining material was sown in a identity preserving fashion in four to five row blocks during the following season.Seeds from the homogeneous blocks (plant and seeds characteristics) were combined in a single stock to form the breeders seed (Toledo et al., 1994).

Performance
BRS 185 reached maturity 121 days after germination and yielded an average of 3,090 kg/ ha in the 24 test environments.This performance was 14.2% and 5.5% superior than that of BR-16 in the last two years and OCEPAR 13 in the last year, respectively, which were used as controls (Table 1).Its superiority is better expressed in the southern and south-west regions of Parana (higher Crop Breeding and Applied Biotechnology, v. 1, n. 1, p. 58-59, 2001 Figure  (Kiihl and Garcia, 1989).
lodging and seed shattering resistance.It flowers in an average of 53 days and is usually ready for harvesting after 118 days