Comparative Study of Leaf Morphology in <i>Aster hispidus</i>Thunb. var. <i>leptocladus</i>(Makino) Okuyama (Asteraceae)

作     者：Hiroshi Hayakawa   Tunala Yukio Minamiya Katsura Ito Stephan Gale Jun Yokoyama Ryo Arakawa Tatsuya Fukuda 

作者机构：不详 

出 版 物：《American Journal of Plant Sciences》 (美国植物学期刊（英文）)

年 卷 期：2012年第3卷第1期

页      面：110-113页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：Anatomical Analysis Aster hispidus var. leptocladus Cell Number Minitualization Serpentine Stenophyllization 

摘      要：The comparative morphology and anatomy of leaves in the serpentine endemic Aster hispidus Thunb. var. leptocladus (Makino) Okuyama and its close relative A. hispidus var. hispidus were examined. Our morphological analysis revealed that the leaves of A. hispidus var. leptocladus were significantly smaller and narrower than those of A. hispidus var. hispidus. In particular, our anatomical analysis indicated that a decreased cell number of the horizontal axis of a leaf was involved in A. hispidus var. leptocladus. This was the same process as the changing pattern of the leaves of rheophytic species, and so, similar morphological leaf modifications occurred under different selection pressures of the serpentine soil and flooding frequency of river-stream.