<em>Silene latifolia</em>, or white campion (formerly <em>Melandrium album</em>)
Silene latifolia, or white campion (formerly Melandrium album), is a well-recognized historical model of plant dioecy and heteromorphic sex chromosomes. Its large genome of 3012 Mbp is organized in 12 pairs of chromosomes, one of these pairs being sex chromosomes: XY in males and XX in females. The metaphase sex chromosomes can be easily distinguished from autosomes because the Y chromosome is the largest at c. 570 Mbp, and the X chromosome is second largest, at c. 400 Mbp. The Y chromosome has at least three genic regions responsible for the development of male (staminate) flowers; one of these Y-linked genic regions corresponds to suppression of carpel development in male flowers. The absence of the Y chromosome leads to female floral development (exclusive carpel formation). This fluorescence image shows the metaphase chromosomes from a male individual with the X and Y chromosomes indicated. Chromosomes were counterstained with DAPI (diamino phenylindole, here in red) and tagged with two fluorescent DNA probes-X-43.1 subtelomeric repeat (green) and (CAT)10 microsatellite (yellow).
Items posted on the Botanical Society of America's website by the author/creator are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. We value sharing, growing and learning together. In the spirit of fairness, we believe in the attribution of materials and ensuring the appropriate voices are in place when considering further use.