Morphology and Yield of Isogenic Diploid and Tetraploid Maize Inbreds and Hybrids
1989
Bradley, Sockness | Dudley, J. W.
A potential use of induced polyploidy in maize (Zea mays L.) is to increase total biomass production, for energy or silage production, by capitalizing on the direct consequences of chromosome duplication, i.e., larger cell and plant parts. The objective of this study was to determine the effects of ploidy level per se on morphological traits and grain and stover yields in maize. Three diploid (2n) inbreds were derived as paternal haploids from homozygous autotetraploid (4n) inbreds. The In and 4n inbreds and the three possible hybrids at each ploidy level were evaluated in 1986 and 1987 at each of two different planting dates. In general, 4n inbreds and hybrids had longer, wider leaves, larger stalk diameters, and higher grain and stover moisture than their 2n counterparts. Stover, cob, grain, and total biomass yields were greater for 2n inbreds and hybrids. Significant ploidy ✕ inbred and ploidy ✕ hybrid interactions resulting in reverse rankings at the 2n and 4n levels were found for certain traits. Thus, ranking of genotypes at the In level is not necessarily indicative of their rankings at the 4n level. These results do not support the use of 4n polyploids to increase total biomass production. Supported by funds from the Illinois Agric. Exp. Stn. and a grant from the Standard Oil Company (SOHIO).
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