A.O. Titus, O.O. Arogundade, I. I. Ogunlowo, O. Oladipo
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引用次数: 0
摘要
研究人员对尼日利亚的三种红掌属植物(Lamiaceae)进行了显微形态学研究,以调查其在分类学上的重要解剖特征。从尼日利亚西南部不同地点采集了以下植物样本,即 Plectranthus aegyptiacus (Forssk.) C. Chr.、Plectranthus esculentus N.E.Br. 和 Plectranthus monostachyus (P. Beauv.) B. J. Pollard。进行了表皮层、脉序模式和叶柄的解剖学研究。采用单链簇分析法(SLCA)和单因素方差分析法(ANOVA)以及邓肯多重范围检验法(DMRT)对参数进行分析,并采用显微照片记录观察结果。叶片表皮的特征,如表皮细胞形状、反侧壁形态、气孔类型、毛状体类型和麦角物质,对划分物种至关重要。大量淀粉粒的出现将单叶皂荚树与其他物种区分开来,直的反壁形态将埃斯库尔特皂荚树区分开来,而大量晶沙的出现则将埃及皂荚树区分开来。从数量上看,各物种正面和背面的气孔指数(S.I.)和毛状体长度均有显著差异(P≤0.05)。所研究植物样本的脉纹模式也显示出特定的特征。不规则的叶脉间距、优美的次脉类别和多角形的小窠形状将埃斯库尔特草与其他物种区分开来。
Micro-morphological study of three members of genus Plectranthus L. (Lamiaceae) in Nigeria
Micro-morphological studies of three members of the Genus Plectranthus L. (Lamiaceae) in Nigeria were conducted to investigate the anatomical characteristics of taxonomic importance. The following plant samples were collected from various locations in Southwestern Nigeria, namely Plectranthus aegyptiacus (Forssk.) C. Chr., Plectranthus esculentus N.E.Br. and Plectranthus monostachyus (P. Beauv.) B. J. Pollard. The anatomical study of the lamina epidermis, venation pattern and petiole were performed. The Single Linkage Cluster Analysis (SLCA) and one-way Analysis of Variance (ANOVA) with the Duncan Multiple Range Test (DMRT) were used to analyze the parameters, and photomicrographs were employed to document the observations. Foliar epidermal characteristics such as epidermal cell shape, anticlinal wall pattern, stomata types, trichome types and ergastic substances are essential in delimiting the species. The identification of numerous starch grains delimits P. monostachyus from the other species, a straight anticlinal wall pattern delimits P. esculentus, and the presence of abundant crystal sands delimits P. aegyptiacus. Quantitatively, stomata index (S.I.) and trichome length for both adaxial and abaxial surfaces were significantly different (P≤0.05) among the species. The venation pattern of the studied plant samples also revealed specific characteristics. Irregular vein spacing, eucamptodromous secondary vein category and polygonal areole shape delimit P. esculentus from the other species.