木槿的发育可塑性及种下分类研究

STUDIES ON DEVELOPMENTAL PLASTICITY AND INTRASPECIES TAXONOMY OF HIBISCUS SYRIACUS

对紫花单瓣木槿、紫花重瓣木槿和牡丹木槿在叶和花部性状上的发育可塑性研究表明 ,三个种下类群 ,特别是紫花单瓣木槿和牡丹木槿的叶片性状具有很大的发育可塑性 ,但花部性状的发育可塑性则相对很小 ,暗示着花部性状较叶片性状具有更大的分类价值。通过种下类群间表型性状的比较 ,发现牡丹木槿在叶缘、叶柄长度、花色、花冠直径、花梗长度、果实长宽比等性状上都与其它两个类群存在显著差异 ,从而建议将牡丹木槿确立为亚种 (H .syriacusLinn .subsp .paeoniflorus (Gagnep .)G .R .

The developmental plasticity of leaves and flowers in Hibiscus syriacus var. syriacus, H. syriacus f. violaceum and H. syriacus f. paeoniflorus has been studied in this paper, the results showed that the three infraspecific taxa have more considerable developmental plasticity in leaf characters than that in flowers, especially in H. syriacus f. syriacus and H. syriacus f. paeoniflorus, thus indicated that the latter have more significant taxonomic value than the former. On the basis of comparing on the phenotypic characters among the three infraspecies, many notable distinguishes in characters such as leaf margin, the length of petiole, the corolla diameter, the length of pedicel, and the ratio of length and width of fruits, etc., have been found between H. syriacus f. paeoniflorus and the others, the results proposed that H. syriacus f. paeoniflorus should be treated as a subspecies (H. syriacus Linn. subsp. paeoniflorus (Gagnep.) G. R. Shi) of Hibiscus syriacus Linn. .