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Normal Gossypium hirsutum displays an abundance of trichomes on the stems and leaves at all stages of vegetative development. A single plant of the strain Orinoco represents a radical departure from this pattern in that it has glabrous stems and pubescent leaves. Genetical studies revealed that glabrous stem is inherited as a simple dominant trait when Orinoco is crossed to the hirsute-stemmed variety, Empire. The possible value of this new character as a marker stock is underscored.
2 Geneticist, Crops Research Division, ARS, USDA, Crop Science Department, North Carolina State University, Raleigh, N.C.
Received for publication June 24, 1966.
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