Anales del Jardín Botánico de Madrid, Vol 68, No 1 (2011)

Self-incompatibility, floral parameters, and pollen characterization in the narrow endemic and threatened species Artemisia granatensis (Asteraceae)


https://doi.org/10.3989/ajbm.2276

Julio Peñas
Plant Conservation Unit, Department of Botany, University of Granada, Spain

Juan Lorite
Plant Conservation Unit, Department of Botany, University of Granada, Spain

Francisca Alba-Sánchez
Plant Conservation Unit, Department of Botany, University of Granada, Spain

María Angélica Taisma
Instituto de Biología Experimental, Centro de Botánica Tropical, Universidad Central de Venezuela, Venezuela, Bolivarian Republic of

Abstract


Artemisia granatensis Boiss. is a paradigmatic species for plant conservation in Spain and Europe. It is a critically endangered (CR) endemic species growing above 2500 m in the Sierra Nevada (southern Spain). Natural populations have been considerably devastated in the past due to intensive human exploitation for folk medicine. The sparse available data concerning the reproductive biology of this species under natural conditions indicate a low reproductive success. To provide additional information on the reproductive biology of A. granatensis, and consequently information useful for the management and conservation of this species, we studied the breeding system through pollen-tube growth. In addition, some floral and pollen traits were recorded. No differences were found between populations in terms of the morphological traits of flowers and inflorescences. A. granatensis is an anemophilous species, and the data indicate that pollen transfer may be limited between isolated populations, and so contributing to an extremely low fruit-set. Results show A. granatensis is selfincompatible, probably with a sporophytic self-incompatibility system, and with no evidence of partial self-incompatibility. Reproductive traits, related to pollen morphology and settling speed may explain the low rate of recruitment in the small populations separated by geographical barriers.

Keywords


reproductive biology; pollen-tube growth; endemic and threatened species; conservation

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