| 0 | PI 608767 | B84 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1992 | DEVELOPED | | | | | | Breeding material | B84 is a yellow dent maize inbred line selected from BSSS(HT)C7, which is an improved Iowa Stiff Stalk synthetic developed by seven cycles of recurrent selection for yield and other traits. Selection was based on half-sib progeny performances with Ia13 double-cross as the tester parent. The designation was changed to BS13(S2)CO because S2 progeny became the basis for evaluation in the next cycle of selection. B84 evolved from one of the 10 S2 lines selected for recombination to give BS13(S2)C1 [BS13(S2)C1 (PI 608782) is registered in Crop Sci. 19:755]. The line has been developed by selection and self-pollination in the ear-to-row system for six generations. The plant has an erect-leaf orientation and will produce a high frequency of harvestable second ears when the plant density is less than 40,000 plants/ha. Pollen production is good, and silks emerge 1 to 2 days after the first shedding of pollen. The date of silk emergence is 1 to 2 days later than that of B73. Most ears have 14 to 16 kernel rows; the seed is yellow with a rounded crown and shallow dent and intermediate in size. Seed yield is good, being slightly higher than that of B73. Inbred B84 has intermediate resistance to leaf feeding by the European corn borer (Ostrinia nubilalis Hubner). Data from single-cross evaluations for 4 years in south-central and southern Iowa show that B84 yields better than B73 in single-cross hybrids, has similar root and stalk strength, but drops fewer ears. Although B84 was developed from the same recurrent selection program as was B73, but two cycles later, the yield performance of the single cross between the two lines indicates that they should not be considered sister lines. Maturity classification is AES800. | 1082045 | PI 608767 |
| 4 | PI 600959 | 'LH145' | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1983 | DEVELOPED | 1983 | | | | | Cultivar | Dent type. Best adapted to most regions in the United States. 60 days from emergence to 50% of plants in silk (1294 heat units). Plant 207 cm tall (to tip of tassel), 82 cm ear height (to base of top ear), top ear internode 15 cm long, no tillers, slight two-ear tendency per stalk, normal cytoplasm type. Leaf color 7.5 Gy 5/6 (Munsell color charts for plant tissues), 30-60 degree angle from stalk (upper half), sheath pubescence light, few marginal waves, few longitudinal creases, 8 cm width at widest point of ear node leaf, 78 cm length of ear node leaf, 12 leaves per mature plant. Tassel has 6 lateral branches, 30-40 degree angle from central spike, penduncle 0 cm long from top leaf to basal branches, medium pollen shed, anther pink, glume green with purple stripes, pollen restoration for cytoplasms not tested. Ear 16 cm long, 32 mm midpoint diameter, 58 grams, 14 distinct and straight kernel rows, silk green, fresh husk dark green, dry husk buff, medium husk extension at harvest (barely covering ear), short (<8 cm) husk leaf, shank 8 cm long with 7 internodes, horizontal at dry husk stage, average taper, average drying time for unhusked ear. Kernel 10 mm long, 5 mm wide, 3 mm thick, shape grade 40-60% rounds, variegated pericarp colorless brown and light bronze at embryo end, aleurone homozygous and white, endosperm yellow and normal starch type, 22 grams per 100 seeds (unsized sample). Cob 20 mm in diameter at mid-point, strong, red. Resistant to northern leaf blight (race 1). Most closely resembles A635Ht for maturity, and A632Ht for plant type, ear type, kernel type, and usage. | 1156011 | PI 600959 |