Fig. 3From: Transcriptome sequencing and gene expression analysis revealed early ovule abortion of Paeonia ludlowiiUltrastructure of normal ovules and aborted ovules 15 days after natural pollination: CW: cell wall; EX: exudate; FN: free nuclear; Nu: nucleolus; a-c: The endosperm free nucleus of the normal ovule is intact; d-f: The free nuclear endosperm of aborted ovules is completely degraded, and the inner integument cells are significantly different from normal ovulesBack to article page