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The tassels of the second variety were removed by hand so that the second variety could be pollinated by the first. Hybrid corn was detassled manually until the mids when a cytoplasm was discovered that would cause one of the inbred lines to be male sterile while the hybridized seed corn it produced would regain male fertility. This gene allowed seed corn companies to greatly reduce their labor costs by producing seed corn without the need for manual detasseling.
By the mids nearly all seed corn was produced with this gene. Basra , pp. This situation changed in with an outbreak of the fungus southern corn leaf blight. The cytoplasm used to produce male sterility was highly susceptible to this fungus. Smith , pp. In the mids machines were developed to help reduce the large labor costs associated with manual detasseling and as a response to a shrinking rural teen labor force.
In the s male sterile varieties were reintroduced that were not susceptible to southern corn leaf blight, however the reliance on a single sterile variety seen in the s has not been repeated. Today corn hybridization is accomplished by a combination of machine and manual detasseling as well as male-sterile genes. Seed corn fields are planted in a repetitive pattern known as a "panel", "block", "frame", "bay" or "set" depending on the area of the country.
There are two main planting patterns for these panels. A panel may be planted in a 6: Panels are also commonly planted in a 4: Other, less common, patterns are also used including 4: In all cases the pattern is continued throughout the corn field.
All or portions of seed corn fields may be surrounded by extra rows of male plants if it is likely that wind may carry foreign pollen into the seed corn field. These extra rows are called "buffer" or "isolation" rows depending on the area of the country. Another important aspect to keeping undesirable pollen out of seed corn fields is a process known as roguing , a process that removes plants that differ from the variety intentionally planted.
From Wikipedia, the free encyclopedia. Retrieved October 12, Retrieved from " https: Hybridisation biology Child labour Maize. Views Read Edit View history. The following is an overview of the Shipping Pass Pilot subscription service.
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