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

AutorLora, Jorge ; Herrero Romero, María ; Hormaza Urroz, José Ignacio
Palabras claveAnnona cherimola
bicellular pollen
pollen evolution
tricellular pollen
Fecha de publicaciónabr-2009
EditorBotanical Society of America
CitaciónAmerican Journal of Botany. 2009 ; 96: 802-808
ResumenMost 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.
Versión del editorhttp://www.amjbot.org/cgi/content/full/96/4/802
ISSNPrint: 0002-9122
Electronic: 1537-2197
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