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The morphology and performance of near-isogenic lines of soybeans with monogenically different pubescence types were investigated. Hairs of the normal, dense, and sparse types are similar, each consisting of a very long (1- to 3-mm) cylindrical cell with one, two, or three basal cells. Hairs of curly pubescence are similar initially to normal hairs, but then become flat, curl, and tend to fall off. Glabrous plants have hair stubs made up of one to seven nearly isometric cells. Puberulent plant hairs consist of a single elongate (0.1 mm) apical cell with one, two, or three basal cells.
Marked growth differences in the field were associated with differences in infestation by the potato leafhopper (Empoasca fabae (Harris)). Dense pubescent plants grew tallest followed in descending order by normal, sparse, curly, and glabrous types. Yields of lines with normal, dense, and sparse pubescence were similar, and superior to yields of the curly and glabrous lines.
Key Words: glycine max (L.) Merrill Trichome Empoasca fabae (Harris).
2 Former Research Assistant, Department of Agronomy, University of Illinois, now Soybean Breeder, Uttar Pradesh Agricultural University, India; Professor of Plant Genetics, Department of Agronomy, University of Illinois; and Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agricultural, and Professor of Plant Genetics, Department of Agronomy, University of Illinois.
Received for publication August 7, 1970.
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