Pollenmorphologie und Systematik in der Gattung Centaurea L. s. 1.

Wagenitz, Gerhard

doi:10.1016/s0367-1615(17)33078-1

Cited by 94 publications

(156 citation statements)

References 7 publications

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“…In attempts to solve phylogenetic problems in Centaurea, the first detailed morphological analyses of pollen grains in the genus were made by Wagenitz (1955) and Avetisjan (1964). Wagenitz (1955) typified Centaurea pollen grains by morphological features, using the following features to group acetolyzed pollen: pollen shape, exine ornamentation, internal and external layers of columellae, length of colpus, pore shape and costae.…”

Section: Discussionmentioning

confidence: 99%

“…Wagenitz (1955) typified Centaurea pollen grains by morphological features, using the following features to group acetolyzed pollen: pollen shape, exine ornamentation, internal and external layers of columellae, length of colpus, pore shape and costae. Serrulata, Crupina and Centaurium pollen types were recognized as the most primitive; Dealbata, Cyanus, and Montana as intermediate; and Scabiosa and Jacea as the most advanced.…”

Section: Discussionmentioning

confidence: 99%

“…In the Jacea pollen type, the spines are reduced are subprolate spheroidal shape. Wagenitz (1955Wagenitz ( , 1976 put forward the idea that reduction of the spines and inner columellae, lengthening of the colpus and thickening of the costae are progressive characteristics in the Asteraceae family. In all taxa studied here, the spines are shorter than 1 μm and the colpus are quite long.…”

Section: Discussionmentioning

confidence: 99%

“…We analyzed a total of 19 taxa belonging to the genus Centaurea. Among such taxa, the exine sculpture is reportedly scabrate when the sculpturing elements are less than 1 μm and microechinate when they are 1-2 μm (Wagenitz 1955).…”

Section: Methodsmentioning

confidence: 99%

“…Wagenitz (1955) divided the genus Centaurea into eight subgenera, on the basis of exine structure and sculpturing: Serratula, Centaurium, Scabiosa, Crupina, Jacea, Dealbata, Montana and Cyanus. Villodre & Garcia-Jacas (2000) stated that pollen type is one of the most reliable characteristics for establishing phylogeny in the Jacea group.…”

Section: Introductionmentioning

confidence: 99%

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Pollen morphology of Centaurea L. (Asteraceae) in Iran

et al. 2013

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The genus Centaurea L. is one of the largest genera in the family Asteraceae. The number of taxa included in this genus ranges from 500 to 600 worldwide. Iran is one of the major centers of diversity for this genus. Pollen morphology has proved useful in the systematics of Asteraceae, as well as in that of some of its genera and species. The pollen morphology of 19 taxa of the genus Centaurea was investigated in detail by light and scanning electron microscopy. Examination under light microscopy showed pollen grains to be tricolporate, isopolar, radially symmetrical, oblate spheroidal, prolate spheroidal, subprolate, tectum perforate and scabrate. Based on the exine ornamentation observed under scanning electron microscopy, we identified two types of pollen grains, designated type I (dense acute spinules) and type II (sparse spinules). All of the taxa evaluated resemble Wagenitz's Jacea type. We present micrographs of pollen grains, together with descriptions of the characteristics of their structure. We found that the pollen characters (shape, exine structure, sculpturing) were useful for classification.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pollen morphology of Centaurea L. (Asteraceae) in Iran

et al. 2013

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Systematic importance of achene macro‐micromorphological characteristics in selected species of the genera Crupina, Jurinea, and Klasea (Asteraceae) from Turkey

Bona

2020

Microscopy Res & Technique

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This study focuses on the macro-micromorphological achene characteristics of 12 species of the genera Crupina, Jurinea, and Klasea (Asteraceae) using light microscopy and the scanning electron microscopy (SEM). The morphological characteristics of the achenes, including shape, size, color, and surface pattern of achene, and hair structure, length, and color of pappus are studied. The results show that the achene length is between 3 and 8 mm, and its width is between 1 and 4 mm. Pappus is 4-15 mm long and persistent for seven species. SEM analysis shows four different achene surface patterns for the studied species: smooth, undulate, smooth-undulate, and undulate-ruminate. The genus Crupina has darkly colored achenes with yellow, dense firm hairs, and the achene surface pattern is smooth. Triangular and sulcate achenes seem to characteristic for the genus Jurinea. The genus Klasea distinguished from the remaining species studied with its straw-colored and deciduous pappus. Macro-micromorphological characteristics provide effective tools for both generic and intrageneric differentiation for the studied species. Research Highlights • In the genus Crupina, the achene is darkly colored with yellow, dense firm hairs, the pappus is red-purple above and yellow below, and the achene surface pattern is smooth. • The genus Jurinea can easily be separated from the remaining studied species with their triangular and sulcate achenes. • A straw-colored and deciduous pappus seems to be characteristic of the genus Klasea. • Achene macro-micromorphological characteristics provide useful tools that help the identification of the delimitation of the species.

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Extreme environmental conditions and phylogenetic inheritance: systematics of Myopordon and Oligochaeta (Asteraceae, Cardueae‐Centaureinae)

Hidalgo

Garcia‐Jacas

Garnatje

et al. 2008

TAXON

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The genus Myopordon, with six perennial species from Iran, Lebanon, Syria and Turkey, had until recently been placed in the Carduinae subtribe. Oligochaeta, composed of four annual species from the Caucasus, India, the Near East and Pakistan, was considered related to the genus Rhaponticum in the Centaureinae subtribe. The two genera have apparently not much in common; however, evidence that both are closely related within the Rhaponticum group was provided by recent molecular phylogenetic reconstructions. New and previously published cytogenetical (fluorescent in situ hybridization of rDNA genes, fluorochrome banding of AT‐ and GC‐rich regions, silver nitrate staining of active ribosomal genes, genome size assessment), karyological, molecular phylogenetic and palynological data are evaluated in the light of the recent evidence concerning the relationships of Myopordon and Oligochaeta. Myopordon presents a constant chromosome number and a homogeneous pattern in physical mapping of rDNA genes, contrasting with a strong variability in chromosome banding, genome size and pollen‐type. Such tendencies could be related to the environmental pressures in the high mountains where species of Myopordon occur. This also accords well with the phylogeny and the geographic distribution of the genus. Phylogenetic reconstructions resolve Oligochaeta as being nested in the clade of Myopordon species. The exceptional cytogenetical, karyological, as well as palynological characters of Oligochaeta are apparently derived from a Myopordon‐like ancestor.

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Pollenmorphologie und Systematik in der Gattung Centaurea L. s. 1.

Cited by 94 publications

References 7 publications

Pollen morphology of Centaurea L. (Asteraceae) in Iran

Pollen morphology of Centaurea L. (Asteraceae) in Iran

Systematic importance of achene macro‐micromorphological characteristics in selected species of the genera Crupina, Jurinea, and Klasea (Asteraceae) from Turkey

Extreme environmental conditions and phylogenetic inheritance: systematics of Myopordon and Oligochaeta (Asteraceae, Cardueae‐Centaureinae)

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