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CROP BREEDING, GENETICS & CYTOLOGY

Genetic Control of Prolificacy and Related Traits in the Golden Glow Maize Population

II. Genotypic Analysis

Dep. of Agronomy, Univ. of Wisconsin-Madison, Madison, WI 53706

^* Corresponding author (deleonn{at}msu.edu)

The open-pollinated maize (Zea mays subsp. mays) population Golden Glow [GG(MP)] provides excellent material for the study of morphological and genetic changes associated with selection for prolificacy. Late generations of the GG(MP), when planted at low densities, resemble the architecture of teosinte (Z. mays subsp. parviglumis), the ancestor of maize. Our objectives were (i) to identify molecular markers linked to chromosomal regions that influenced prolificacy and related morphological traits, (ii) to determine whether genes previously shown to influence branching patterns in maize were associated with quantitative trait loci (QTLs) influencing these traits, and (iii) to determine whether epistatic interactions among putative QTLs influenced prolificacy and correlated traits. A mapping population was developed from the cross of inbred A679 and a highly prolific S₁ plant from Cycle 23 of GG(MP). Simple sequence repeat (SSR) and amplified fragment length polymorphism (AFLP) markers were combined for the linkage map construction. Thirty-three QTLs were found for 14 of the 16 traits analyzed. A region located on Linkage Group 1 (LG 1) shared similarities with the pattern of development suggested for the teosinte branched1 (tb1) mutant. This suggests that genetic control of prolificacy and associated traits in GG(MP) may resemble the genetic changes underlying branching morphology that occurred during maize domestication. No evidence for additive-by-additive epistatic interactions was found.

Abbreviations: AFLP, amplified fragment length polymorphism • CIM, composite interval mapping • cM, centimorgan • LG, linkage group • PCR, polymerase chain reaction • QTL, quantitative trait locus • SSR, simple sequence repeat • tb1, teosinte branched1