| 0 | 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 |