(A) Micrographs showing embryo production after 9 days on development medium in the WT, Glb1 RNAi, Glb2−/− mutant, and the two ethylene insensitive mutant lines ein2, ein3. (B) Number of embryos expressed as a percentage of WT control (ctrl) in the different lines subjected to different treatments in the induction medium: SNP (100 μM), ETH (10 μM), cPTIO (50 μM), or AOA (10 μM). Values are means ± SE of at least three biological replicates. ∗ indicates statistically significant differences (P < 0.005) from the WT (ctrl) value.