Contribution to the Karyological Knowledge of Mediterranean Romulea Species (Iridaceae)

• Autores: Lorenzo Peruzzi, Gianluca Iiriti, Flavio Frignani
• Localización: Folia geobotánica: A journal of plant ecology and systematics, ISSN-e 1874-9348, ISSN 1211-9520, Vol. 46, Nº 1, 2011, págs. 87-94
• Idioma: inglés
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• Resumen

  • Eighteen chromosome counts are reported in nine Mediterranean Romulea species. Among them, four species have a wide distribution range (R. bulbocodium, R. columnae, R. ramiflora and R. rollii) and five are narrow central Mediterranean endemics (R. bocchierii, R. ligustica, R. linaresii, R. requienii and R. revelieri). Chromosome numbers range from 2n?=?3x?=?27 in one R. columnae accession to 2n?=?6x?=?54 in R. linaresii. Our results only partially agree with previous reports, and the chromosome number records of R. bocchierii, R. ligustica, R. linaresii subsp. linaresii and R. revelieri presented here are completely new. According to our data and contrary to previous statements, x?=?9 seems to be the basic chromosome number in this group of Mediterranean Romulea. Moreover, a highly significant negative correlation between the chromosome size and ploidy level was found.