PCS1 functions in gametogenesis and embryogenesis.

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PCS1 functions in gametogenesis and embryogenesis. PCS1 functions in gametogenesis and embryogenesis. (A) RNA blot showing that PCS1 is expressed in developing flowers and young siliques (1–8 days post‐pollination (DPP)). (B) Arabidopsis inflorescence of a PCS1p∷GUS line stained for GUS activity. GUS activity is evident in developing anthers and in pollen (inset). (C,D) Relatively weaker GUS activity was detected in developing ovules (C) and young seeds (∼5 DPP) (D). No GUS activity was detected in other organs. (E) Mature pollen grains from a pcs1/+ qrt1/qrt1 plant (qrt1, quartet1). (F) Viability staining of pollen from a pcs1/+ qrt1/qrt1 plant showed that the pcs1 mutation causes pollen degeneration. The inset shows stained pollen from wt plants. The size difference is due to difference in magnification. (G) Portion of an ovary from a pcs1/+ plant at the flower‐opening stage showing two aborted ovules (arrows). (H) Portion of a silique (∼6 DDP) from a pcs1/+ plant showing a degenerated ovule (red arrow) and two immature mutant seeds (white arrows) with abnormal morphology. Scale bars in (G,H), 0.2 mm. (I,J) Confocal laser scanning microscopy images of a wt embryo (I) and a mutant embryo (J) from the same silique of a pcs1/+ plant. (K) Genomic DNA from developing pcs1 mutation seeds showing oligonucleosomal DNA ladders. Genomic DNA was isolated from 4‐ to 8‐day‐old mutant and wt seeds, separated on an agarose gel and probed with total genomic DNA. Magnifications: B, × 7; C, × 5; D, × 6; E, × 200; F, × 140. Xiaochun Ge et al. EMBO Rep. 2005;6:282-288 © as stated in the article, figure or figure legend