DENT CORN INBREDS
The inbred lines of field corn listed below were produced in isolated fields. Although the fields were well isolated and carefully rogued, 100 percent freedom from contamination cannot be guaranteed. It will be necessary for the grower to do a limited amount of roguing and sorting. Seed of these inbred lines has not been treated with a fungicide.
LINES AVAILABLE
Hand pollinated breeder seed of the following inbreds is available at $50 per unit of 100 kernels, postage paid. Licensing by ISURF is not required. Seed requests may be made directly to CAD.
B73 |
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B84 |
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B79
B79 is a dent line selected from Iowa Two-Ear Synthetic (BS10). B79 has good yield in crosses with Mo17 and related lines. It tends to have two ears per plant, intermediate seed size with reddish color, and seed yield is relatively good. B79 has intermediate resistance to northern corn leaf blight and first- and second-generation European corn borer. Relative maturity of B79 is 1,500 U.S. heat units from planting to flowering.
B89
Inbred B89 was developed from a population of Iowa Stiff Stalk Synthetic [BSSS(R )C7] that was improved in a reciprocal recurrent selection program for seven cycles. Inbred B89 is similar to B73 for dates of tassel shedding and silk emergence. Plant and ear heights for B89 are approximately 35 cm lower than for B73. With artificial infestations, B89 has good resistance to first-generation European corn borer, but is susceptible to the second generation. Under Iowa conditions, B89 has good plant health. The kernel has a shallow dent. In single cross evaluations by the Iowa Agriculture Experiment Station, B89 has shown its best performance with Mol7. It seems to be a line that can be used as either male or female in the production of single-cross seed. Inbreds B73 and B89 are not sister lines.
NO B89, AS AN INBRED OR COMPONENT OF ANY HYBRID, SHALL BE GIVEN OR SOLD OUTSIDE THE UNITED STATES AND CANADA WITHOUT THE KNOWLEDGE AND CONSENT OF THE IOWA AGRICULTURE AND HOME ECONOMICS EXPERIMENT STATION.
B90
Inbred B90 was developed from a population of Iowa Corn Borer Synthetic / 1 [BSCB1(R )C7] that was improved in a reciprocal recurrent selection program for seven cycles. Consequently, B90 is not closely related to any inbred lines that have been released by the Iowa Agriculture Experiment Station. The line was developed by self-pollination in an ear-to-row breeding system for several generations. Its days to tassel shedding and silk emergence are 2 days earlier than B73. Plant and ear heights are approximately 25 cm shorter than for B73. With artificial infestations, B90 has good resistance to first-generation European corn borer and intermediate resistance to the second generation. Plant health is good in Iowa conditions. The kernel has a shallow dent. The inbred seed yield is relatively low; consequently, it should be used as a male parent in the production of hybrid seed. In single-cross evaluation by the Iowa Agriculture Experiment Station, B90 has shown its best performance with B73. Single crosses B73 x Mol7 and B73 x B90 have shown similar yields, but B73 x B90 has had lower grain moisture, less root and stalk lodging, and fewer dropped ears.
B91
Inbred B91 was developed from a population of Iowa Corn Borer Synthetic / 1 [BSCB1(R )C8] that was improved for eight cycles in a reciprocal recurrent selection program. Inbred B91 is related to B90, but is not closely related to any other inbred lines that have been released by the Iowa Agriculture Experiment Station. The line was developed by self-pollination in an ear-to-row breeding system for several generations. The days to tassel shedding and silk emergence are 3 days earlier than for B73. Plant and ear heights are approximately 25 cm shorter than for B73. With artificial infestations, B91 has good resistance to first-generation European corn borer and intermediate resistance to the second generation. Plant health is good in Iowa conditions. The kernel has a shallow dent. The inbred seed yield is relatively good; consequently, it may be used as either male or female in the production of hybrid seed. In single-cross evaluation by the Iowa Agriculture Experiment Station, B91 has shown its best performance with B73. Single crosses B73 x Mol7 and B73 x B91 have shown similar grain yields, but B73 x B91 has had lower grain moisture, less root and stalk lodging, and fewer dropped ears.
NO B90 OR B91, AS AN INBRED OR COMPONENT OF ANY HYBRID, SHALL BE GIVEN OR SOLD OUTSIDE THE UNITED STATES WITHOUT THE KNOWLEDGE AND CONSENT OF THE IOWA AGRICULTURE AND HOME ECONOMICS EXPERIMENT STATION.
B93
Inbred B93 was developed from the backcross population of (B70 x H99 )H99. The line was obtained by self-pollination in an ear-to-row breeding system for several generations. The purpose of the program was to obtain a line more vigorous than H99, particularly for pollen production and seed yield, and at least equal for hybrid performance. Tassel shed and silk emergence are one day later than H99. Pollen production is much better than for H99. Plant and ear heights are similar to H99. B93 is highly resistant to first-generation European corn borer, moderately susceptible to the second generation, and has good disease resistance in Iowa conditions. The seed has a shallow dent and is much larger than that of H99. Seed yield for B93 is much improved, compared with H99. In single-cross evaluation by the Iowa Agriculture Experiment Station, B93 has shown its best performance in single crosses with A632, B73, and B87. It is similar to H99 for hybrid yield and resistance to stalk lodging, better than H99 for resistance to root lodging, and slightly higher for harvest grain moisture.
B94
Inbred B94 was developed from a population of Iowa Stiff Stalk Synthetic, [BSSS(R )C8] that was improved by a reciprocal recurrent selection program for eight cycles. B94 has no close relationship to B73. The line was developed by self-pollination in an ear-to-row breeding system for six generations. Its days to tassel shed and silk emergence are similar to B73. Pollen production is very good. B94 has similar plant height to B73, and ear height is 30 cm shorter. The line has good resistance to first-generation European corn borer and is moderately susceptible to the second generation. B94 has good plant health in Iowa conditions and good tolerance to heat and drought. The seed, which has a shallow dent, is slightly larger than for B73, and seed yield appears to be about one-half that of B73. In single-cross evaluations by the Iowa Agriculture Experiment Station, B94 has shown its best single-cross hybrid performance with Mo17. The single-cross yield is similar to B73 x Mo17, root and stalk lodging are less, and harvest grain moisture is slightly higher.
B95
Inbred B95 was developed from 'Iowa Corn Borer Synthetic No. 1' (BSCB1) after 7 cycles of reciprocal recurrent selection [BSCB1(R )C7-55]. The other population in the reciprocal recurrent selection program was Iowa Stiff Stalk Synthetic [BSSS(R )Cn]. The lines was developed by selection and self pollination in the breeding nursery and included in the crossing nurseries for evaluation in single crosses. B95 has best performance in crosses with B73. B95 flowers 2 days later than B73 and Mo17 and has plant and ear heights similar to B73. Ears have 12 rows of yellow, flinty kernels on red cobs. B95 has intermediate resistance to first generation European corn borer leaf feeding.
B97
Inbred B97 was developed from the Iowa Corn Borer Synthetic No. 1 (BSCB1) after 9 cycles of reciprocal recurrent selection [BSCB1(R )C9-2]. The other population in the reciprocal recurrent selection program was Iowa Stiff Stalk Synthetic S2 generation. It was one of the parents o the superior half-sib families in testcrosses with BSSS(R )C9. After testcross [BSSS(R )Cn]. The line was developed by selection and self pollination in the ear-to-row method for 7 generations after the evaluations with B73, B97 was evaluated in single crosses in northern Iowa. Single crosses that included B97 was one of its parents were above average for yield relative to experiment and check hybrid means. B97 is a tall, vigorous line with above average disease resistance and above average resistance to first- and second-generation European corn borer infestation. Ears have 14 rows of large, yellow dent kernels with red cobs. Ear length is similar to B73. Tassels have good pollen shed under heat and drought stress. B97 has potential as either a male or female parent for hybrid seed production. Maturity classification is AES700-800.
B98
B98 was developed from BS11 after 5 cycles of reciprocal full-sib selection [ BS11(FR)C5-2803]. The other population in the reciprocal full-sib selection program was BS10. B98 was identified as one of the parents of the superior full-sib families after 5 generations of full-sib family evaluations. The lines was included in the breeding nursery at the S6 generation and 3 generations of selection and self-pollination were made in the ear-to-row method of breeding. B98 exhibits good performance in crosses with B73 and has a tall plant type with dark green, narrow upright leaf orientation. B98 has excellent stay green, suggesting above average resistance to diseases and insects. Plants have a 2-ear tendency and produce at least one ear under stress. Yellow, flinty kernels are produced on ears with 14 to 16 rows. The ears have a red cob, and kernel weight and yield are similar to B73. B98 is a source of germplasm that is different from that commonly used in breeding programs. Maturity classification is AES800.
B99
B99 was developed from Iowa Corn Borer Synthetic No. l (BSCB1) after 10 cycles of reciprocal half-sib selection with Iowa Stiff Stalk Synthetic (BSSS) as the tester. B99 was a selection [BSCB1(R )C10-7233] that was used to form BSCB1(R)C11. BSCB1(R )C10-7233 was included in the breeding and topcross nurseries at the S1 generation. On the basis of testcross performance, the line was advanced ear-to-row in the breeding nursery and evaluated in single crosses. B99 exhibits good performance in crosses with B73 and other BSSS related lines. B99 flowers 2 days earlier than B73, has plant and ear heights similar to B73, and ears have 12 to 14 rows of yellow, dent kernels on red cobs. Yield is similar to Mo17. B99 has good plant health with average root and stalk strength and with average resistance to first-generation European corn borer. B99 has greater potential as a male parent in production of single-cross seed. Maturity classification is AES800.
B100
B100 has developed from a cross of B85 and H99[(B85 x H99)H99-361]. Selection was tested with A632 as tester. Based on testcross performance, the selection was advanced ear-to-row by four generations of self-pollination and evaluated in single-cross trials with A632, A681, B87, and SD40. Flowering time of B100 is similar to A632 and four days later than A681. Pollen production is excellent, seed yields are similar to A681, plant and ear heights are 20 to 30 cm less than A632 and A681. B100 has good plant health and easy to maintain. Maturity classification is AES600.