Pollen morphology of the genus<i>Paliurus</i>(Rhamnaceae)

Schirarend, C.

doi:10.1080/00173139609429093

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…Pollen grain morphology of H. dulcis is in accordance with the general morphological pattern found in Rhamnaceae (Perveen and Qaiser 2005;Johri et al 1992;Schirarend 1996) and is classified as Hovenia-type following Perveen and Qaiser (2005) descriptions.…”

Section: Discussionsupporting

confidence: 49%

Pollen and microsporangium development in Hovenia dulcis (Rhamnaceae): a different type of tapetal cell ultrastructure

et al. 2015

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Despite that there is some literature on pollen morphology of Rhamnaceae, studies addressing general aspects of the microsporogenesis, microgametogenesis, and anther development are rare. The aim of this paper is to describe the ultrastructure of pollen grain ontogeny with special attention to tapetum cytology in Hovenia dulcis. Anthers at different stages of development were processed for transmission and scanning electron microscopy, bright-field microscopy, and fluorescence microscopy. Different histochemical reactions were carried out. The ultrastructural changes observed during the development of the tapetal cells and pollen grains are described. Large vesicles containing carbohydrates occur in the tapetal cell cytoplasm during the early stages of pollen development. Its origin and composition are described and discussed. This is the first report on the ontogeny and ultrastructure of the pollen grain and related sporophytic structures of H. dulcis.

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Section: Discussionsupporting

confidence: 49%

Pollen and microsporangium development in Hovenia dulcis (Rhamnaceae): a different type of tapetal cell ultrastructure

et al. 2015

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“…Pollen grain morphology is in accordance with the general morphological pattern of the family Rhamnaceae [2, 11, 17, 47]. In Ziziphus lotus L., the exine is characterized by a thick tectum, a thin infratectal layer that appears granular, and a thick nexine [12].…”

Section: Discussionmentioning

confidence: 59%

Pollen, Tapetum, and Orbicule Development inColletia paradoxaandDiscaria americana(Rhamnaceae)

Gotelli

Galati

Medán

2012

The Scientific World Journal

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Tapetum, orbicule, and pollen grain ontogeny in Colletia paradoxa and Discaria americana were studied with transmission electron microscopy (TEM). The ultrastructural changes observed during the different stages of development in the tapetal cells and related to orbicule and pollen grain formation are described. The proorbicules have the appearance of lipid globule, and their formation is related to the endoplasmic reticulum of rough type (ERr). This is the first report on the presence of orbicules in the family Rhamnaceae. Pollen grains are shed at the bicellular stage.

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“…2). Evidence from pollen analysis also suggests this division (Schirarend, 1996). Pollen grains of the Mediterranean P. spina-christi and the Chinese P. hemsleyanus and P. orientalis have similar characters (Lasiodiscus Hook.f.type pollen), while those of P. ramosissimus and P. hirsutus have a different morphology (Sageretia Brongn.-type pollen).…”

Section: Discussionmentioning

confidence: 96%

Out‐of‐India dispersal of Paliurus (Rhamnaceae) indicated by combined molecular phylogenetic and fossil evidence

Chen

Meseguer

Martin

et al. 2012

TAXON

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Paliurus (Rhamnaceae) is a small genus with a narrow and disjunct distribution in East Asia and the Mediterranean. Fossil evidence from the Late Cretaceous to the present suggests it once had a broad geographic distribution, encompassing parts of India, North America, Asia, and Europe. To reconstruct the evolutionary history of Paliurus and understand the origin of the disjunction observed today in the Northern Hemisphere, phylogenetic and biogeographical reconstructions were performed based on ITS, trnL-F, and rbcL sequences. Paliurus is shown to be a monophyletic genus, which could be divided into two clades as suggested by previous studies. Biogeographical inference integrated with fossil information indicates that the origin and dispersal pattern of the genus coincide with the "Out-of-India" hypothesis. The genus may have originated in India or other parts of Gondwana and then dispersed to East Asia after the collision of the Indian subcontinent with Eurasia, and to North America via the Bering land bridge. Paliurus appears to have reached the Mediterranean region in the late Oligocene following closure of the Turgai Strait. The uplift of the Qinghai-Tibet Plateau and the advent of drying and cooling climates during the Miocene may have fragmented the distribution of the genus, shaping the biogeographical patterns observed today. Paliurus populations in different regions either became extinct or adapted to changes in local ecological conditions following global climatic shifts through geological time.

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Pollen morphology of the genusPaliurus(Rhamnaceae)

Cited by 11 publications

References 2 publications

Pollen and microsporangium development in Hovenia dulcis (Rhamnaceae): a different type of tapetal cell ultrastructure

Pollen and microsporangium development in Hovenia dulcis (Rhamnaceae): a different type of tapetal cell ultrastructure

Pollen, Tapetum, and Orbicule Development inColletia paradoxaandDiscaria americana(Rhamnaceae)

Out‐of‐India dispersal of Paliurus (Rhamnaceae) indicated by combined molecular phylogenetic and fossil evidence

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