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Variabilità cariologica in Limonium bonifaciense Arrigoni et Diana (Plumbaginaceae)

Diana, Silvana (1995) Variabilità cariologica in Limonium bonifaciense Arrigoni et Diana (Plumbaginaceae). Bollettino della Società sarda di scienze naturali, Vol. 30 (1994/95), p. 531-544. ISSN 0392-6710. Article.

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Karyological variability of the unique Limonium bonifaciense population from Corsica has been studied. Pollen and stigma turned out to be monomorphic, so this population is autosterile. Pollen grain and seedling morphology anomalies have also been observed. Such a karyologic variability, never found in Limonium nor in other plants, concerns both chromosome number and karyotype (sometimes a serie n=xo=9 has been found, with bigger size chromosomes and one large metacentric). The following karyologic situation becomes evident from karyotype studies: 34.69% have 2x+x=27; 34.69% have 2x+xo=27, 2x=18 and xo=9; 10.20% have 2x+x+xo=36; 6.12% have 2x+x+xo=36, 2x+x=27, 2x= 18 and xo=9; 2.04% have 2x= 18; 14.28% are aneuploid. Even if definitive conclusions on the nature and causes of such a variability can not yet be drawn, some considerations can be made to explain the results of this study. L. Bonifaciense, being probably of hybrid origin, shows facultative meiosis and apomixis, is also monomorphic, autosterile and may not yet be genetically stabilized. Thus, as a hypothesis, it may receive compatible pollen from another species of Limonium. As a consequence, di-hybrid genome embryos are sometimes formed, whose cells try to restore its own genome by segregating the heterogeneous ones.

Item Type:Article
ID Code:3193
Uncontrolled Keywords:Limonium, karyological variability, Corsica
Subjects:Area 05 - Scienze biologiche > BIO/02 Botanica sistematica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher Policy:Depositato per gentile concessione dell'Editore
Additional Information:Relazione presentata al convegno su "Isolamento e biodiversità nelle popolazioni vegetali: problemi biosistematici, floristici e conservazionistici", Sassari (Italia), 13-15 maggio 1994.
Deposited On:23 Nov 2009 11:16

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