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Root Morphology of Contrasting Maize Genotypes

^a Dep. of Plant Sci., McGill Univ., Macdonald Campus, 21,111 Lakeshore, Ste-Anne-de-Bellevue, QC, H9X 3V9, Canada, and Univ. of Passo Fundo, Passo Fundo, RS, 99001-970, Brazil
^b Agric. and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada
^c Dep. of Plant Sci., McGill Univ., Macdonald Campus, 21,111 Lakeshore, Ste-Anne-de-Bellevue, QC, H9X 3V9, Canada
^d Dep. of Nat. Resource Sci., McGill Univ., Macdonald Campus, 21,111 Lakeshore, Ste-Anne-de-Bellevue, QC, H9X 3V9, Canada

View larger version (26K): [in a new window]   Fig. 1. Root length and surface area of maize genotypes under three rates of N fertilization. Genotypic means of a root variable followed by a different letter are declared to be different from each other (P 0.05) by an ANOVA-protected LSD test. LRS, leafy reduced stature; LNS, leafy normal stature; and P3905, Pioneer 3905.

View larger version (18K): [in a new window]   Fig. 2. Across-genotype means of root dry mass and root/shoot ratio for three rates of N fertilization for maize grown to silking. Means of a root variable followed by a different letter are declared to be different from each other (P 0.05) by an ANOVA-protected LSD test.

View larger version (23K): [in a new window]   Fig. 3. Distribution of total root length of maize over 10 root diameter ranges for three maize genotypes grown to silking for the sampling and entire root-measurement approaches. Bars represent ± standard error. LRS, leafy reduced stature; LNS, leafy normal stature; and P3905, Pioneer 3905.

View larger version (28K): [in a new window]   Fig. 4. Percent distribution of total root length of maize over 10 root diameter ranges for genotypes grown to silking. LRS, leafy reduced stature; LNS, leafy normal stature; and P3905, Pioneer 3905.

View larger version (15K): [in a new window]   Fig. 5. Relationship between total fresh root length and root dry mass of maize genotypes grown indoors to silking. LRS, leafy reduced stature; LNS, leafy normal stature; and P3905, Pioneer 3905.

View larger version (21K): [in a new window]   Fig. 6. Mean root diameter across genotypes for three different rates of N fertilization. Genotypic means of a root variable followed by a different letter are declared to be different from each other (P 0.05) by an ANOVA-protected LSD test.