Fig. 4
From: Overexpression of sesame polyketide synthase A leads to abnormal pollen development in Arabidopsis
Transmission electron micrographs (TEM) observation of the ultrastructure of microspores and tapetum development of wild-type and SiPKSA-overexpressing plants at different anther developmental stages. A, C Tapetal cells of the WT (A) and SiPKSA-overexpressing plants during stages 9–10 (C). B, D Microspores of the WT (B) and SiPKSA-overexpressing plants during stages 9–10 (D). (E, F) Pollen walls of WT (E) and SiPKSA-overexpressing plants (F) at stages 11–12. Msp, microspore; DMsp, degenerated microspore; T, tapetum; In, intine; Ex, exine; N, nucleus; P, plastid filled with plastoglobuli; PG, pollen grain. Scale bars are 2 μm