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Seed Quality Assurance in Maize Breeding Programs: Tests to Explain Variations in Maize Inbreds and Populations

^a Dep. of Agronomy, Iowa State Univ., 166 Seed Science Center, Ames, IA 50011
^b Dep. of Statistics, Iowa State Univ
^c Corn Insect and Crop Genetics Res. Unit, USDA-ARS, Ames, IA
^d Clinton, IL. This journal paper of the Iowa Agric. and Home Econ. Exp. Stn., Ames, IA, Project no. 3638 and 3773, was partially supported by Hatch Act, State of Iowa funds

View larger version (54K): [in this window] [in a new window]   Fig. 1. Scatter plots between the saturated cold (SC), accelerated aging (AA), fast green (FG), soak (Soak), and electrical conductivity (EC) tests, and the inbred quality index (IQI) for data collected at Clinton, IL, Replication 1, 2003. Tests are listed in the diagonal squares. The dots inside the other squares represent the data. Data are in percentage for SC, AA, and FG tests. Data for EC are calculated as [200 – (EC6h + EC24h)] in µS cm–1 g–1 seed. Values for IQI range from 1 to 10.

View larger version (16K): [in this window] [in a new window]   Fig. 2. Screen plot of the principal component analysis for the saturated cold (SC), accelerated aging (AA), fast green (FG), soak (Soak), and electrical conductivity (EC) tests performed on the data collected at Clinton, IL, Replication 1, 2003. Components 1, 2, 3, 4, and 5 are the linear combinations of the variables (or tests).

View larger version (53K): [in this window] [in a new window]   Fig. 3. Plots of ordered tests highlighting the genotypes with inbred quality index (IQI) values in the upper quartile (approximately equal to 9.25) in both years at Clinton, IL, compared with the distribution of the percentage values of the same subset of genotypes in the other seed quality tests that make up the IQI. Data are in percentage for the saturated cold (SC), accelerated aging (AA), and fast green (FG) tests. Data for electrical conductivity (EC) is calculated as [200 - (EC6h + EC24h)] in µS cm–1 g–1 seed. Values for IQI range from 1 to 10. A total of 160 data points were included in these graphs (closed circles are genotypes with an IQI3 9.25). Open circles are all other entries.