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Recurrent Selection for Rind Thickness in Maize and its Relationship With Yield, Lodging, and Other Plant Characteristics¹

This study attempted to evaluate the effectiveness of recurrent selection in increasing the stalk rind thickness in a synthetic population of maize (Zea mays L.) and determine the associated response of lodging and several other characters to selection for rind thickness. Three cycles with a selection intensity of 10% and effective populations of 883, 891, and 1054 were completed on an individual plant basis. The rind thickness of all cycles were not compared in a single year.

Lodging decreased from 24.2 to 20.7% after two cycles of selection in topcrosses of the selected populations with five single-crosses and from 25.7 to 19.1% after three cycles of selection in the populations per se. Grain yield decreased with selection for rind thickness from 64.3 to 50.9 quintals/ha in the populations per se and from 67.9 to 64.7 quintals/ha in the topcrosses. No substantial changes occurred in grain moisture at harvest, percent stand, ear height, nor plant height.

Key Words: Corn • Zea mays L. • Exotic germplasm

² Formerly graduate assistant, now assistant corn breeder, O&s Gold Seed Co., Parkersburg, Iowa, and professor of agronomy, Purdue Univ.

Received for publication May 3, 1975.