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Promoter activity of CA2 gene on gametophytes and embryos. The first ATG codon of CA2 were fused to the GUS (uidA) reporter gene 2000bp upstream and introduced into WT plants by floral dip. (A–C) Female gametophytes. (D–F) Male gametophytes. (G–I) Globular to heart stage of embryogenesis. (J–L) Green cotyledon stage of embryogenesis. Bars, 50 μm. (This figure is available in colour at JXB online.)
