The comparative reproductive biology of a tetraploid species, Hedychium villosum, and its diploid progenitor H.tenuiflorum (Zingiberaceae)
The comparative reproductive biology of a tetraploid species, Hedychium villosum, and its diploid progenitor H.tenuiflorum (Zingiberaceae)
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DOI：
10.1111/plb.12080
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发表时间：
2014-05-01
期刊：
影响因子：
3.9
通讯作者：
Li, Q. J.
中科院分区：
文献类型：
--
作者：
Gao, J. Y.;Liu, Q.;Li, Q. J.
多倍体的进化优势可能来自花部性状和育种系统的一些变化，这可能使多倍体能够开发新的栖息地并变得广泛。本研究对四倍体姜花及其二倍体祖先细花姜花的花生物学特性进行了比较研究，以评估两种姜花的生殖分化。结果表明，四倍体品种的花比二倍体品种持续时间更长，产生更多的花蜜。这两个物种的开花时间完全没有重叠。对自然种群中访花者的观察表明，蝴蝶和天蛾是这两个物种的有效传粉者，但这两个物种之间的蝴蝶和天蛾组合存在显着差异。人工授粉试验和花粉管生长试验结果表明，二倍体细花水仙为自交不亲和，四倍体绒毛水仙为完全自交亲和。绒毛毛藓的分布范围和生境多样性都比毛藓大得多。细花多倍体繁殖可能使四倍体H.villosum开发以前二倍体H.细花
The evolutionary advantages of polyploidy may result from a number of changes in floral traits and breeding system, which may enable polyploids to exploit new habitats and become widespread. In this study, we comparatively investigated the floral biology of the tetraploid species Hedychium villosum and its diploid progenitor H.tenuiflorum, to assess reproductive divergence between the two species. The results showed that flowers of the tetraploid species last longer and produce more nectar than did diploid species. The flowering times of the two species did not overlap at all. Observations of floral visitors in natural populations demonstrated that butterflies and hawkmoths were effective pollinators of both species, but there was a significant difference in butterfly and hawkmoth assemblages between the two species. The hand-pollination experiments and pollen tube growth experiments suggested that diploid H.tenuiflorum was self-incompatible, while tetraploid H.villosum was completely self-compatible. H.villosum has a much wider distribution range and occupies more diverse habitats than H. tenuiflorum. Polyploidisation may enable tetraploid H.villosum to exploit new habitats previously unavailable to diploid H. tenuiflorum.