Figure 4. Phenotypic analysis of the spp heterozygotes.

(A, B) Plants of the indicated genotypes were grown in vitro on selective medium (non-selective in the case of wild type) for 7 days, and then photographed (A). Additional similar plants were transferred to soil on day 7, and then allowed to grow further until they were 21 days old prior to photography (B). Representative plants are shown in each case. (C) Chlorophyll concentrations in 21-day-old plants grown as described above were determined using a SPAD-502 meter. Values shown are means (±SD) derived from six independent measurements per genotype, each one taken using a different plant. Units are nmol chlorophyll a+b per mg fresh weight of tissue.