Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba 305-0005, Japan.
Mol Ecol. 2009 Dec;18(23):4904-11. doi: 10.1111/j.1365-294X.2009.04406.x. Epub 2009 Oct 26.
To test our hypothesis of hybrid formation involving the 'independent gametophyte' phenomenon in ferns, we identified the genomic formulae and ploidy level of gametophytes of the Vandenboschia radicans complex at the periphery of a sporophyte population. We identified haploid gametophytes of V. kalamocarpa (one of the two putative parents of V.xstenosiphon) in a hybrid sporophyte population in Japan that lacks fertile non-hybrid individuals. Furthermore, diploid sporophytes of the species were not found within a 50-km radius. This finding supports a hypothesis of hybridization involving the 'independent gametophyte' phenomenon and provides a new perspective on the geographical distribution of fern hybrids.
为了验证我们关于涉及蕨类植物“独立配子体”现象的杂种形成的假设，我们在一个孢子体种群的边缘鉴定了 Vandenboschia radicans 复合体的配子体的基因组公式和倍性水平。我们在日本的一个杂种孢子体种群中鉴定出了 V. kalamocarpa（V.xstenosiphon 的两个假定亲本之一）的单倍体配子体，而该种群中没有可育的非杂种个体。此外，在 50 公里半径范围内也没有发现该物种的二倍体孢子体。这一发现支持了涉及“独立配子体”现象的杂交假说，并为蕨类植物杂种的地理分布提供了新的视角。
