Fig. 1. Meiotic prophase stages and timing of the bouquet in Secale cereale cv. `Blanco'. Telomeres (green) were detected by FISH using a probe to the telomere repeat, and chromatin (red) was stained with DAPI. Single optical sections of meiotic nuclei are shown. (a) Premeiotic interphase, (b) leptotene and (c) zygotene. The bouquet is evidenced by the close spacing of the telomere FISH signals. (d) Pachytene. Bar, 10 µm.