Taxonomic value of the petiole anatomy in the genus <i>Cinnamomum</i> (Lauraceae) found in Sri Lanka

Abstract

We assessed the petiole anatomy of 8 species of Sri Lankan Cinnamomum (C. capparu-coronde, C. citriodorum, C. dubium, C. litseaefolium, C. ovalifolium, C. rivulorum and C. sinharajaense and C. verum) belonging to the family Lauraceae using light microscopy in the petiole anatomy for identification and classification of species. This is the first report on comprehensive petiole anatomy in Cinnamomum species. The distinctive, important and key taxonomic characteristics of the petiole include the shape and outline of the petiole, the presence of winged extensions, surface grooves on upper surface, presence or absence of trichomes, structure of vascular bundle and stone cell characters (shape, structure, pits and fissure size). These identified petiole characters provide the additional information for the identification of Cinnamomum species. Almost all the characters studied had little difference within a species but vary among the species. However, shape of epidermal cells was relatively constant for all species. All polymorphic characters were used for Principal Component Analysis (PCA) and species were divided into three main clusters. The PCA revealed that acicular crystals, cluster of crystals, trichomes and trichome abundance contribute to the first component that account for 31.76% total variance. Shape of the petiole, upper surface wings and raphides are the major loading characters to the second component. Therefore, anatomical structures of the petiole are useful in the identification and may help for crop improvement, conservation, management and future usefulness of germplasm resources of Cinnamomum species.

Diagnostic Petiole Anatomical Characters and their Systematc Importance in eighteen (18) species of the genus Tephrosia PERS (fabaceae) found in Nigeria

“…The use of petiole characters to resolve some systematic problems in the groups cannot be overemphasized. Several works in this aspect include those of [13] in petiole anatomy in Cinnamomum, [15] in the tribe Dipterocarpeae (Diptorecarpaceae), [17] on Asteraceae among others. Nine (9) anatomical characters were assessed from the photograph images of the eighteen (18) species of Tephrosia studied as shown in Figure 1(a-r).…”

“…The use of petiolar characters to solve taxonomic problems has been established for several genera as up to the work of [11], [12], [13] and [14].…”

Comparative petioler anatomy of tribe Mentheae subfamily Nepetoideae, Lamiaceae from Pakistan

“…The peculiar, significant and key taxonomic features of the petiole in the genus Cinnamomum (Lauraceae) are the shape and outline of the petiole, presence of winged extensions, surface grooves on upper surface, presence or absence of trichomes, structure of vascular bundle and stone cell characters i.e. shape, structure, pits and fissure size are useful in identification (Abeysinghe & Scharaschkin, 2019). N. cataria has a maximum number of parallel rows of xylem vessels among the studied species.…”

Struktur Anatomi Daun Sebagai Bukti Dalam Pembatasan Takson Tumbuhan Berbunga: Studi Kasus 12 Suku Tumbuhan Berbunga Indonesia

“…Bentuk tangkai daun anggota Lauraceae menunjukkan ciri suku, karena adanya kesamaan pada bentuk tangkai daun yaitu busur dan busur menekuk (Moraes 2006;Kumar 2013;Serebrynaya et al 2017;Abeysinghe & Scharaschkin 2019). Metcalfe (1987) menyatakan beberapa marga dari Lauraceae juga dicirikan oleh adanya sel sekretori di beberapa organ.…”