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Unformatted text preview: eral traits for drought tolerance, disease resistance, etc. Hybrid seeds are formed when two Hybrid seeds plants (of different varieties or species) are crossed for specific characteristics. The seeds of the grown vegetables generally cannot be harvested and replanted the next year. This is because the seed from the first generation of hybrid plants (F1) does not reliably produce true copies. Most open­pollinated sweet corn varieties have Most open­pollinated sweet corn varieties have been replaced by improved hybrid varieties that are easy to grow, produce good yields, taste sweeter, and store longer. Varieties are generally classified by seed color, maturity date, or nature of sweetness. Sweet corn varieties are available in yellow, white, or bi­colored types with varying maturity dates from early to mid­ and late season. Based on the nature of kernel sweetness, sweet corns also can be classified into four basic groups: standard, super sweet, sugary enhanced, and synergistic. Field corn contains approximately 4 percent sucrose Field corn (sugar) in the immature milky stage, while "standard" sweet corns at the same stage may contain as much as 6 percent sucrose. (Standard sweet corns contain the recessive "su­1" gene; field corn is dominant for the same gene, making it starchy.) Following harvest, or if left on the stalk too long, sucrose in standard sweet corn is rapidly converted to starch. Standard sweet corns pollinated by either field corn or popcorn will become tough and starchy. "Super sweet" corns contain the shrunken "sh­2" gene, which causes sucrose levels two to three times higher at harvest than standard sweet corns. Sucrose in super sweet varieties will remain relatively high after harvest, making them excellent shipping varieties. Different Kinds of Corn DENT corn, the scientific name of which is Zea mays DENT indentata, is also called "field" corn. It is a corn variety with kernels that contain both...
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