A dataset converted into a TD object containing data corresponding to an
F2 maize reference population from CIMMYT maize drought breeding program,
which was derived from the cross of a drought-tolerant line (P1) with a
drought susceptible line (P2) as described in detail by Ribaut et al. (1996,
1997).
DNA from 211 F2 plants was extracted to produce information for 132
co-dominant markers on 10 linkage groups. Phenotypic evaluations were
performed on 211 F2:3 families, each one derived from an original F2 plant.
The families were evaluated under different water and nitrogen regimes
during 1992, 1994 and 1996. In the winter of 1992 three water regimes were
imposed on the trials: well watered (NS), intermediate stress (IS) and severe
stress (SS). In the winter of 1994, only the IS and SS trials were available.
Nitrogen availability varied in the 1996 trials, with two low nitrogen
treatments (LN, in winter and summer) and one high-nitrogen treatment
(HN in summer). In each of the trials, five traits were evaluated but only
grain yield is included in the data.
Format
A TD object, a list containing 8 data.frames, each with the following columns:
- trial
trial, a combination of water regime, year and nitrogen treatment
- genotype
genotype
- yld
grain yield in tons
References
Ribaut JM, Hoisington DA, Deutsch JA, Jiang C, Gonzalez de Leon D (1996) Identification of quantitative trait loci under drought conditions in tropical maize.1. Flowering parameters and the anthesis-silking interval. Theor Appl Genet 92:905–914
Ribaut JM, Jiang C, Gonzalez de Leon D, Edmeades GO, Hoisington DA (1997) Identification of quantitative trait loci under drought conditions in tropical maize.2. Yield components and marker-assisted selection strategies. Theor Appl Genet 94:887–896