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Genotypic Variation for Root Trait Morphology in a White Clover Mapping Population Grown in Sand

^a Pastoral Genomics, AgResearch Ltd., Grasslands Research Centre, Private Bag 11008, Palmerston North, New Zealand
^b Pastoral Genomics, AgResearch Ltd., Ruakura Research Centre, Private Bag 3123, Hamilton, New Zealand
^c Pastoral Genomics, ViaLactia Biosciences (NZ) Ltd., Auckland, New Zealand

View larger version (30K): [in this window] [in a new window]   Figure 1. Biplot generated using standardized Best Linear Unbiased Predictor values of genotype root trait means from 386 F1 progeny from a white clover mapping population grown in sand. Components I and II account for 55 and 21% of total variation, respectively. The different symbols indicate progeny Groups 1 to 5 generated from cluster analysis. The vectors represent the root traits: RDI, root diameter (mm); RF, number of root forks; RL, root length (cm); RS, root surface area (cm2); RT, No. root tips; RD, root dry weight (g); RV, root volume (cm3); FL, ratio RF/RL (no. cm–1); TL, ratio RT/RL (no. cm–1); SRL, specific root length (cm mg–1). The letters a, b, c, and d, indicate individual progeny genotypes that had the highest above average expression for a range of traits. The arrow () indicates the label of a directional vector that is not legible.

View larger version (36K): [in this window] [in a new window]   Figure 2. Biplot generated using standardized Best Linear Unbiased Predictor values of root trait means from clones of the 386 F1 white clover mapping population progeny grown in hydroponic and sand conditions. Components I and II account for 36 and 27% of total variation, respectively. The symbols indicate progeny Groups 1 to 6 generated from cluster analysis. The vectors represent the root traits: RDI, root diameter (mm); RL, root length (cm); RS, root surface area (cm2); RT, number of root tips; RV, root volume (cm3); TL, ratio RT/RL (no. cm–1). The numbers 5 and 6 included as a suffix in the root trait codes, refer to the hydroponic experiment in year 2005 and sand experiment in year 2006, respectively. The arrows () indicate the labels of directional vectors that are closely aligned and those that are not legible.