English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/12824
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


The coexistence of bicellular and tricellular pollen in Annona cherimola (Annonaceae): Implications for pollen evolution

AuthorsLora, Jorge ; Herrero Romero, María ; Hormaza Urroz, José Ignacio
KeywordsAnnona cherimola
bicellular pollen
pollen evolution
tricellular pollen
Issue DateApr-2009
PublisherBotanical Society of America
CitationAmerican Journal of Botany. 2009 ; 96: 802-808
AbstractMost angiosperms release bicellular pollen. However, in about one-third of extant angiosperms, the second pollen mitosis occurs before anthesis such that pollen is tricellular upon release. The shift from bicellular to tricellular development has occurred several times independently, but its causes are largely unknown. In this work, we observed the coexistence of both kinds of pollen at anther dehiscence in Annona cherimola, a species that belongs to the basal angiosperm family Annonaceae. Examination of pollen cell number during anther development showed that this coexistence was due to a late mitosis starting shortly before pollen shedding. Both types of pollen germinated equally well over the course of development. Because variable proportions of bicellular and tricellular pollen were observed at different sampling times, we tested the role of temperature by performing field and growth chamber experiments, which showed that higher temperatures near anthesis advanced the time of pollen mitosis II. The results show that selection could favor the production of tricellular pollen under certain environmental circumstances that prime rapid pollen germination and provide evidence of a system in which developmental variation persists, but that can be modified by external factors such as temperature.
Publisher version (URL)http://www.amjbot.org/cgi/content/full/96/4/802
Appears in Collections:(EEAD) Artículos
(IHSM) Artículos
Files in This Item:
File Description SizeFormat 
LoraJ_AmJBot_2009.pdf2,04 MBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.