Department of Biology

Aarhus University Seal / Aarhus Universitets segl

Henrik Balslev

Pollen development in three selected species of Rubiaceae provides ontogenetic evidence for pollen evolution

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Pollen development in three selected species of Rubiaceae provides ontogenetic evidence for pollen evolution. / Kuang, Yan Feng; Yue, Lin; Balslev, Henrik; Liao, Jing Ping.

In: Review of Palaeobotany and Palynology, Vol. 289, 104413, 06.2021.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

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Kuang, Yan Feng ; Yue, Lin ; Balslev, Henrik ; Liao, Jing Ping. / Pollen development in three selected species of Rubiaceae provides ontogenetic evidence for pollen evolution. In: Review of Palaeobotany and Palynology. 2021 ; Vol. 289.

Bibtex

@article{702cde22b3d8427db1fda4b5551d8553,
title = "Pollen development in three selected species of Rubiaceae provides ontogenetic evidence for pollen evolution",
abstract = "Pollen development in Ixora chinensis, Pentas lanceolata, and Spermacoce pusilla was investigated. Simultaneous cytokinesis at meiosis, a persistent epidermis, fibrous thickenings in the endothecium, an ephemeral middle layer, and a secretory tapetum that remains uninucleate were observed in all examined species and constitute a family character in Rubiaceae. The main ontogenetic sequence of sporoderm development is generally centripetal and shows major similarities among the studied species, with slight differences in the timing of specific events. Tapetum degradation starts slightly later in I. chinensis than in P. lanceolata and S. pusilla, while intine formation may be slightly later in S. pusilla than in the other two species. Occurrences of orbicules, white-line-centered endexine lamellae and apertural intine projections were observed in I. chinensis and P. lanceolata but not in S. pusilla. Columellae are well-developed in I. chinensis and P. lanceolata but are simplified in S. pusilla. Carbohydrate reserves in mature pollen grains also vary among these three species. Thickened endexine at the apertural sites and a membranous granular layer are shared by the three species. White-line-centered lamellae might represent a common mechanism for endexine formation in the family. Endexine dilations and thickening occurred in the apertural region represent a common character in the family. The ephemeral membranous granular layer developed beneath the endexine is a very common feature for Rubiaceae. Our study shows that ultrastructural and developmental studies are essential in illustrating micromorphological features of pollen especially these ephemeral characters. Thus, application of palynological ontogenetic data to phylogenetic problems deserves more attention.",
keywords = "Endexine, Membranous granular layer, Sporoderm, Ubisch body, White lines",
author = "Kuang, {Yan Feng} and Lin Yue and Henrik Balslev and Liao, {Jing Ping}",
note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
month = jun,
doi = "10.1016/j.revpalbo.2021.104413",
language = "English",
volume = "289",
journal = "Review of Palaeobotany and Palynology",
issn = "0034-6667",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Pollen development in three selected species of Rubiaceae provides ontogenetic evidence for pollen evolution

AU - Kuang, Yan Feng

AU - Yue, Lin

AU - Balslev, Henrik

AU - Liao, Jing Ping

N1 - Publisher Copyright: © 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/6

Y1 - 2021/6

N2 - Pollen development in Ixora chinensis, Pentas lanceolata, and Spermacoce pusilla was investigated. Simultaneous cytokinesis at meiosis, a persistent epidermis, fibrous thickenings in the endothecium, an ephemeral middle layer, and a secretory tapetum that remains uninucleate were observed in all examined species and constitute a family character in Rubiaceae. The main ontogenetic sequence of sporoderm development is generally centripetal and shows major similarities among the studied species, with slight differences in the timing of specific events. Tapetum degradation starts slightly later in I. chinensis than in P. lanceolata and S. pusilla, while intine formation may be slightly later in S. pusilla than in the other two species. Occurrences of orbicules, white-line-centered endexine lamellae and apertural intine projections were observed in I. chinensis and P. lanceolata but not in S. pusilla. Columellae are well-developed in I. chinensis and P. lanceolata but are simplified in S. pusilla. Carbohydrate reserves in mature pollen grains also vary among these three species. Thickened endexine at the apertural sites and a membranous granular layer are shared by the three species. White-line-centered lamellae might represent a common mechanism for endexine formation in the family. Endexine dilations and thickening occurred in the apertural region represent a common character in the family. The ephemeral membranous granular layer developed beneath the endexine is a very common feature for Rubiaceae. Our study shows that ultrastructural and developmental studies are essential in illustrating micromorphological features of pollen especially these ephemeral characters. Thus, application of palynological ontogenetic data to phylogenetic problems deserves more attention.

AB - Pollen development in Ixora chinensis, Pentas lanceolata, and Spermacoce pusilla was investigated. Simultaneous cytokinesis at meiosis, a persistent epidermis, fibrous thickenings in the endothecium, an ephemeral middle layer, and a secretory tapetum that remains uninucleate were observed in all examined species and constitute a family character in Rubiaceae. The main ontogenetic sequence of sporoderm development is generally centripetal and shows major similarities among the studied species, with slight differences in the timing of specific events. Tapetum degradation starts slightly later in I. chinensis than in P. lanceolata and S. pusilla, while intine formation may be slightly later in S. pusilla than in the other two species. Occurrences of orbicules, white-line-centered endexine lamellae and apertural intine projections were observed in I. chinensis and P. lanceolata but not in S. pusilla. Columellae are well-developed in I. chinensis and P. lanceolata but are simplified in S. pusilla. Carbohydrate reserves in mature pollen grains also vary among these three species. Thickened endexine at the apertural sites and a membranous granular layer are shared by the three species. White-line-centered lamellae might represent a common mechanism for endexine formation in the family. Endexine dilations and thickening occurred in the apertural region represent a common character in the family. The ephemeral membranous granular layer developed beneath the endexine is a very common feature for Rubiaceae. Our study shows that ultrastructural and developmental studies are essential in illustrating micromorphological features of pollen especially these ephemeral characters. Thus, application of palynological ontogenetic data to phylogenetic problems deserves more attention.

KW - Endexine

KW - Membranous granular layer

KW - Sporoderm

KW - Ubisch body

KW - White lines

UR - http://www.scopus.com/inward/record.url?scp=85102391991&partnerID=8YFLogxK

U2 - 10.1016/j.revpalbo.2021.104413

DO - 10.1016/j.revpalbo.2021.104413

M3 - Journal article

AN - SCOPUS:85102391991

VL - 289

JO - Review of Palaeobotany and Palynology

JF - Review of Palaeobotany and Palynology

SN - 0034-6667

M1 - 104413

ER -