冬凌草腺毛的形态学及组织化学研究
投稿时间:2011-07-31  修订日期:2011-09-26  点此下载全文
引用本文:刘孟奇.冬凌草腺毛的形态学及组织化学研究[J].西北植物学报,2011,31(11):45~50
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作者单位E-mail
刘孟奇 河南中医学院 964342875@qq.com 
基金项目:河南中医学院博士启动基金( BSJJ-2009-32),安徽省自然科学基金(090411013),河南省科技攻关项目(102102310320)
中文摘要:利用光学显微镜对药用植物冬凌草(Isodon rubescens)地上部分腺毛的形态、分布和组织化学进行了研究。结果表明,冬凌草的叶表皮有三种形态显著不同的毛:非腺毛,盾状腺毛和头状腺毛。盾状腺毛和头状腺毛都具1个基细胞、1个柄细胞和头部。成熟的盾状腺毛的头部一般由4个分泌细胞组成;头状腺毛头部由2个分泌细胞组成。组织化学鉴定结果显示:两种腺毛中都存在着黄酮类成分、盾状腺毛中还存在着单萜、倍半萜等萜类成分;冬凌草甲素可能只存在于盾状腺毛中,但是需要更直接的证据来证明。在筛选冬凌草甲素含量高的品种时,高密度的盾状腺毛可以作为一个非常重要的选择依据。
中文关键词:腺毛 唇形科 冬凌草 组织化学 萜类
 
Morphology and Histochemistry of the Glandular Trichomes of Isodon rubescens (Hemsley) H. Hara [Lamiaceae]
Abstract:The morphology and distribution of leaf trichomes of Isodon rubescens were studied using light microscopy. Three morphologically distinct types of trichomes were observed on I. rubescens leaf surfaces: non-glandular, peltate and capitate glandular. The glandular and non-glandular trichomes were present on both the adaxial and abaxial surfaces. Peltate and capitate glandular trichomes comprised one basal cell, one or two stalk cells and one head. The head of mature peltate glandular trichomes generally consisted of four secretory cells while that of capitate glandular hairs was composed of two cells. Histochemical results indicate existence of flavnoids in both peltate and capitate glandular trichomes. In addition, terpenoids, including monoterpenes, sesquiterpenes etc., exist in peltate glandular trichomes. Peltate glandular trichomes are probably only site of oridonin accumulation, however, this need direct proof to clarify. High density of peltate trichomes might be considered as an important selection character for the screening of I. rubescens with rich content of oridonin.
keywords:Glandular trichomes  Lamiaceae  Isodon rubescens  Histochemistry,terpenoids
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