Abstract：
The Loranthaceae Juss. family includes parasitic species that invade important trees such as fruit trees. In Saudi Arabia, Loranthaceae comprises four genera, which include six species that grow in the western, southwestern, and northern regions: Tapinanthus globifer (A.Rich.) Tiegh, Oncocalyx glabratus (Engl.) M. G. Gilbert, Loranthella deflersii (Tiegh.) S. Blanco & C. E. Wetze, Phragmanthera austroarabica A. G. Mill. & J. Nyberg, Plicosepalus curviflorus (Benth.ex Oliv.) Tiegh. and Plicosepalus acaciae (Zucc.). The species present in the Kingdom of Saudi Arabia have not been the subject of enough studies. This work aims to screen and evaluate the taxonomic importance of the micromorphological traits of leaves and fruits in Loranthaceae species native to Saudi Arabia (SA) using scanning electron microscope (SEM). In this study, cluster dendrogram (CD), principal component analysis (PCA) and analysis of variance (ANOVA) were used to evaluate the ability to discriminate Loranthaceae species using micromorphological characteristics. Most of the micromorphological characteristics of the leaf and fruit surfaces used reflected significant variation between the species of Loranthaceae. The type of stomata, trichome, lenticels, fine relief of the cell wall and wax form were the most taxonomically important characteristics. In addition, the cluster dendrogram of morphological characteristics showed species distribution within branches based on affiliation to subtribes Tapinanthinae and Emelianthinae. To the best of our knowledge, the fruit and leaves of the species under study have never been described using electron microscopy, and this study is considered the first of its kind. It also contributes to solving the classification problems of the family Loranthaceae in general and confirms the importance of the characteristics and methods used as tools for characterizing parasitic species that infect trees and helps to verify their identities. This will help to improve resistance efforts and put effective control plans in place.
摘要：
罗兰科朱斯.科包括入侵重要树木如果树的寄生物种。在沙特阿拉伯,猪兰科包括四个属，其中包括生长在西部的六个物种，西南，和北部地区：Tapinanthusglobifer（A.有钱。)Tiegh,光颈锥花(Engl.)M.G.吉尔伯特，雷兰切拉·弗莱斯(蒂格格。)S.布兰科和C.E.韦兹，奥斯拉格曼塞拉·A·G·米尔。&J.Nyberg,弯曲的plicosepalus（Benth。前Oliv.)泰格。和刺槐（Zucc。).沙特阿拉伯王国中存在的物种尚未得到足够的研究。这项工作旨在使用扫描电子显微镜（SEM）筛选和评估沙特阿拉伯（SA）原产的猪兰科物种的叶片和果实微形态特征的分类学重要性。在这项研究中,簇状树状图（CD），使用主成分分析（PCA）和方差分析（ANOVA）来评估使用微形态特征区分桑兰科物种的能力。所使用的叶片和果实表面的大多数微形态特征反映了猪兰科物种之间的显着差异。气孔的类型,毛状体,皮孔,细胞壁的精细浮雕和蜡形式是最重要的分类学特征。此外,形态特征的簇树状图显示了基于与Tapinanthinae和Emelianthinae亚部落的隶属关系的分支内的物种分布。据我们所知,所研究物种的果实和叶子从未使用电子显微镜进行过描述，这项研究被认为是同类研究中的第一项。它还有助于解决Loranthaceae家族的一般分类问题，并确认了用作表征感染树木的寄生物种并有助于验证其身份的工具的特征和方法的重要性。这将有助于提高抵抗力，并制定有效的控制计划。
