| 6 | PI 644102 | 'P737M20' | Zea mays L. subsp. mays | Florida, United States | NC7 |  | | 1980 | DEVELOPED | 1974 | | | | | Cultivar | Sweet corn inbred. Best adapted to the southeast United States. Maturity is 63 days from emergence to 50% of plants in silk (1167 heat units); 18 days from 50% silk to optimum edible quality (406 heat units); 1488 heat units from 50% silk to harvest at 25% kernel moisture. Plants 183 cm in height (to tassel tip), 71 cm ear height (to base of top ear), 13 cm long top ear internode, no tillers, strong two-ear tendency, normal cytoplasm. Leaves are medium green, 30-60 degrees angle from stalk (upper half), medium sheath pubescence, few marginal waves, longitudinal creases absent. The average ear node leaf width is 9 cm at its widest point with a length of 66 cm. Tassels have 18 lateral branches, 30-40 degrees of branch angle from central spike, peduncle length of 36 cm from top leaf to basal branches, heavy pollen shed, yellow anther and glume. Ears 12 cm in length, 45 mm mid-point diameter, 54 grams in weight, 14 distinct straight kernel rows, green silk (exposed at silking stage), light green husk color (fresh), buff husk color (dry), very long husk extension (harvest stage), husk leaf length greater than 15 cm, 12 cm long shank with five internodes, upright position at dry husk stage, slight taper, average drying time (unhusked ear). Kernel (dried, from ear mid-point) 12 mm long, 9 mm wide, 6 mm thick, pericarp whitish/partly transparent, aleurone homozygous transparent, endosperm yellow-orange, sweet (su1) type endosperm, 23 gm weight/100 seeds. Cob 30 mm diameter at mid-point, weak, white. Susceptible to stalk rot (diplodia, fusarium, and gibberella), cornborer, northern, southern, and western rootworm, earworm, sapbeetle, and aphid. Resistant to northern and southern leaf blight, southern rust, bacterial leaf blight, corn smut, maize dwarf mosaic, smut, and bacterial wilt. Most closely resembles Iowa 2132 for maturity, plant type, ear type, kernel type, edible quality, and usage. P737M20 differs from Iowa 2132 in that P737M20 possesses the Ht gene for dominant resistance to northern corn leaf blight and Iowa 2132 does not. Also, the physiological response of P737M20 to Helminthosporium turcicum is different from that of Iowa 2132; when infected by H. turcicum, P737M20 will develop small resistant non-sporulating lesions while the lesions produced by infected Iowa 2132 will be large and sporulate, thus spreading the disease. | 1129260 | PI 644102 |
| 7 | PI 644099 | 'Florida 56' | Zea mays L. subsp. mays | Florida, United States | NC7 |  | | 1977 | DEVELOPED | 1975 | | | | | Cultivar | Sweet corn inbred with seed containing the sh2 gene in the starchy (su1) background and is more shrunken and lighter in weight than normal sweet corn (su1) seed. It also contains much less starch and has a higher sugar content in the endosperm. Best adapted to most regions in the United States. Maturity is 80 days from emergence to 50% of plants in silk; 21 days from 50% silk to optimum edible quality; 70 days from 50% silk to harvest at 25% kernel moisture. Plants 137 cm in height (to tassel tip), 53 cm ear height (to base of top ear), 10 cm long top ear internode, 2 tillers about the same height as the main plant, strong two-ear tendency, normal cytoplasm. Leaf medium green, light sheath pubescence, no marginal wave, longitudinal creases absent. The width of the ear node leaf averages 7 cm at widest point and has a length of 61 cm. A mature plant averages 11 leaves. Tassels are yellow and silks are green, pollen production is excellent. Ears are about seven inches long, have 14 to 16 rows of yellow kernels, and one to two inch unfilled tips. Ear shanks have five nodes and are about one to two inches long. Husk extension is long. This inbred most closely resembles Iowa 2256, except the Florida 56 ears are longer, husk extensions are slightly shorter, and husk ear diameters are slightly larger. The primary difference between the inbreds is that Florida 56 has the homozygous recessive sh2 gene, whereas, Iowa 2256 has the homozygous recessive su1 gene. Plants are about six inches shorter then Florida 32 plants in the Idaho seed production area averaging five to 5.5 feet tall, while having slightly less than one tiller about two feet tall per plant. Field germination and vigor of the seed has generally been very good. Plants have a rather "droopy" appearance as the tassels start to emerge. This curvature makes detasseling slightly more difficult than usual. | 1125855 | PI 644099 |
| 8 | PI 644100 | 'Florida 32' | Zea mays L. subsp. mays | Florida, United States | NC7 |  | | 1977 | DEVELOPED | 1975 | | | | | Cultivar | Sweet corn inbred with seed containing the sh2 gene in the starchy (su1) background and is more shrunken and lighter in weight than normal sweet corn (su1) seed. It also contains much less starch and has a higher sugar content in the endosperm. Best adapted to most regions in the United States. Maturity is 76 days from emergence to 50% of plants in silk; 21 days from 50% silk to optimum edible quality; 70 days from 50% silk to harvest at 25% kernel moisture. Plants 140 cm in height (to tassel tip), 28 cm ear height (to base of top ear), 10 cm long top ear internode, one or two tillers about the same height as the main stalk, slight two-ear tendency, normal cytoplasm. Leaves are dark green, light sheath pubescence, no marginal wave, longitudinal creases absent. The ear node leaf has an average width of 5 cm and length of 58 cm. There are 8 leaves per mature plant. Tassels have 10 lateral branches, 30-40 degrees of branch angle from central spike, peduncle length of 7 cm from top leaf to basal branches, medium pollen shed, yellow anther and glume. Ears are 20 cm in length, 40 mm mid-point diameter, 106 grams in weight, 16 distinct slightly curved kernel rows, well filled to the tips, green silk (exposed at silking stage), dark green husk color (fresh), buff husk color (dry), long husk extension (harvest stage), husk leaf medium length, 13 cm long shank with six internodes, upright position at dry husk stage, average taper, slow drying time (unhusked ear). Kernel (dried, from ear mid-point) 9 mm long, 6 mm wide, 4 mm thick, shape grade less than 20% rounds, pericarp colorless, aleurone homozygous yellow, endosperm yellow, extra sweet (sh2) type endosperm, 9 gm weight/100 seeds. Cob 23 mm diameter at mid-point, weak, white. Susceptible to northern leaf blight, bacterial leaf blight, and earworm. This inbred most closely resembles Iowa 2132 (su1) for maturity, plant type, ear type, and kernel type, and Illinois 453 (sh2) for edible quality. Ear length and husk extension of Florida 32 are slightly shorter than that of Iowa 2132. The major difference between Iowa 2132 and Florida 32 is that Florida 32 has the homozygous recessive sh2 gene, whereas, Iowa 2132 has the homozygous recessive su1 gene. Plants are five to six feet tall under good conditions in the Idaho seed production area and average 1.5 tillers per plant that are two to six feet tall. Difficulty has been encountered in producing good stands in Idaho, particularly early in the season when soil temperatures are cool. Seedlings are very susceptible to damping off. | 1125856 | PI 644100 |