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Plants
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Pollen and Pollination
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Pollen and Pollination

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Cell Biology".

Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 13933

Special Issue Editor

Prof. Dr. Alberto L. Teixido

E-Mail Website
Guest Editor
Departamento de Botânica e Ecologia, Universidade Federal de Mato Grosso, Av Fernando Corrêa 2367, 78060-900 Cuiabá, MT, Brazil
Interests: plant–animal interactions; plant–environment interactions; fruit and seed production; pollen dispersal; flower size; floral water costs; floral resource allocation; floral enemies; pollen limitation; phenotypic selection

Special Issue Information

Dear Colleagues,

Pollination has long fascinated biologists and naturalists, and since Darwin’s evolutionary theories and his studies of plant reproduction were publicized, pollination has been considered a key process of selection driving the evolution of seed plants. Consequently, the study of pollen is essential to better understand the processes involved in pollination, from pollen formation and structure to fertilization of ovules, throughout the transfer of pollen grains.

This Special Issue on “Pollen and Pollination” aims to contribute with innovative empirical, methodological, and theoretical knowledge to advance our understanding of palynology, as well as to disentangle the complexity of pollen transfer mediated both by abiotic and biotic vectors and anatomical, histochemical, and physiological mechanisms of pollination. The new insights in this Special Issue will attract the interest of a broad range of plant ecologists involved in the study of key issues, such as paleobotany, plant anatomy and physiology, and plant–pollinator interactions.

Prof. Dr. Alberto L. Teixido
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Plants is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

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12 pages, 2884 KiB  
Article
Two Self-Incompatibility Sites Occur Simultaneously in the Same Acianthera Species (Orchidaceae, Pleurothallidinae)
by Mariana Oliveira Duarte, Denise Maria Trombert Oliveira and Eduardo Leite Borba
Plants 2020, 9(12), 1758; https://doi.org/10.3390/plants9121758 - 11 Dec 2020
Cited by 6 | Viewed by 2553
Abstract
In most species of Pleurothallidinae, the self-incompatibility site occurs in the stylar canal inside the column, which is typical of gametophytic self-incompatibility (GSI). However, in some species of Acianthera, incompatible pollen tubes with anomalous morphology reach the ovary, as those are obstructed [...] Read more.
In most species of Pleurothallidinae, the self-incompatibility site occurs in the stylar canal inside the column, which is typical of gametophytic self-incompatibility (GSI). However, in some species of Acianthera, incompatible pollen tubes with anomalous morphology reach the ovary, as those are obstructed in the column. We investigated if a distinct self-incompatibility (SI) system is acting on the ovary of A. johannensis, which is a species with partial self-incompatibility, contrasting with a full SI species, A. fabiobarrosii. We analyzed the morphology and development of pollen tubes in the column, ovary, and fruit using light, epifluorescence, and transmission electron microscopy. Our results show that the main reaction site in A. johannensis is in the stylar canal inside the column, which was also recorded in A. fabiobarrosii. Morphological and cytological characteristics of the pollen tubes with obstructed growth in the column indicated a process of programmed cell death in these tubes, showing a possible GSI reaction. In addition, partially self-incompatible individuals of A. johannensis exhibit a second SI site in the ovary. We suggest that this self-incompatibility site in the ovary is only an extension of GSI that acts in the column, differing from the typical late-acting self-incompatibility system recorded in other plant groups. Full article
(This article belongs to the Special Issue Pollen and Pollination)
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16 pages, 1072 KiB  
Article
Bee-Mediated Selection Favors Floral Sex Specialization in a Heterantherous Species: Strategies to Solve the Pollen Dilemma
by Larissa C. Oliveira, Alberto L. Teixido, Renata Trevizan and Vinícius L. G. Brito
Plants 2020, 9(12), 1685; https://doi.org/10.3390/plants9121685 - 01 Dec 2020
Cited by 8 | Viewed by 3243
Abstract
Animal-pollinated plants show a broad variation in floral morphology traits and gametophyte production within populations. Thus, floral traits related to plant reproduction and sexuality are usually exposed to pollinator-mediated selection. Such selective pressures may be even stronger in heterantherous and pollen flowers, in [...] Read more.
Animal-pollinated plants show a broad variation in floral morphology traits and gametophyte production within populations. Thus, floral traits related to plant reproduction and sexuality are usually exposed to pollinator-mediated selection. Such selective pressures may be even stronger in heterantherous and pollen flowers, in which pollen contributes to both bee feeding and pollination, overcoming the “pollen dilemma” or the inability to perform both functions simultaneously. We describe the phenotypic gender and sexual organ morphology of flowers in two populations of Macairea radula (Melastomataceae), a heterantherous and buzz-pollinated species with pollen flowers. We estimated selection gradients on these traits through female and male fitness components. Both populations showed sizeable phenotypic gender variation, from strict hermaphrodites to increased femaleness or maleness. We found a continuous variation in style and stamen size, and this variation was correlated with corresponding shape values of both sexual organs. We detected bee-mediated selection towards short and long styles through seed number and towards intermediate degrees of heteranthery through pollen removal in one population, and selection towards increased maleness through pollen dispersal in both populations. Our results suggest that bee-mediated selection favors floral sex specialization and stylar dimorphism in M. radula, optimizing reproductive success and solving the pollen dilemma. Full article
(This article belongs to the Special Issue Pollen and Pollination)
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10 pages, 2354 KiB  
Protocol
Development and Optimization of a Germination Assay and Long-Term Storage for Cannabis sativa Pollen
by Daniel Gaudet, Narendra Singh Yadav, Aleksei Sorokin, Andriy Bilichak and Igor Kovalchuk
Plants 2020, 9(5), 665; https://doi.org/10.3390/plants9050665 - 23 May 2020
Cited by 13 | Viewed by 7110
Abstract
Pollen viability and storage is of great interest to cannabis breeders and researchers to maintain desirable germplasm for future use in breeding or for biotechnological and gene editing applications. Here, we report a simple and efficient cryopreservation method for long-term storage of Cannabis [...] Read more.
Pollen viability and storage is of great interest to cannabis breeders and researchers to maintain desirable germplasm for future use in breeding or for biotechnological and gene editing applications. Here, we report a simple and efficient cryopreservation method for long-term storage of Cannabis sativa pollen. Additionally, the bicellular nature of cannabis pollen was identified using DAPI (4′,6-diamidino-2-phenylindole) staining. A pollen germination assay was developed to assess cannabis pollen viability and used to demonstrate that pollen collected from different principal growth stages exhibited differential longevity. Finally, a simple and efficient method that employs pollen combined with baked whole wheat flour and subsequent desiccation under vacuum was developed for the long-term cryopreservation of C. sativa pollen. Using this method, pollen viability was maintained in liquid nitrogen after four months, suggesting long-term preservation of cannabis pollen. Full article
(This article belongs to the Special Issue Pollen and Pollination)
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