FIGURE 4.

Endogenous hormone content of zygotic embryos (genotype 4098) at different developmental stages (A) and of different genotypes at the cleaved-embryo stage (B). (A) The different developmental stages represented from 1 to 5: stage 1 cleaved polyembryos (Figure 1M); stage 2 proembryo (Figure 1N); stage 3 dominant embryo (Figure 1O); stage 4 columnar embryo (Figure 1P); stage 5 cotyledonary embryo (Figures 1R,S). (B) Genotypes 4098, 5009, 4009, Y21, and 27 were tested, and genotypes 4098 and 5009 were more competent to form somatic embryos. Data are means ± SD of three replicates.