Correlation between PGM activities as quantified in whole-seedling extracts (y axis) and total PGM activity, calculated based on scoring of staining of separate organs (x axis), in the Cvi × Ler recombinant inbred population. PGM activities in extracts are given in nanomoles per second per gram dry weight. For each line, staining figures for the whole seedlings were calculated as a weighed sum of data of each organ, assuming relative proportions per organ to be 40%, 5%, 15%, 25%, 5%, 5%, and 5% for cotyledons, apex, hypocotyl, root, root neck, root tip, and root hairs, respectively. Lines were divided into eight classes based on weighed means of staining and pooled. Averages for pooled lines were calculated and plotted ± se.