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Title of Journal: Plant Syst Evol

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Abbravation: Plant Systematics and Evolution

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Springer Vienna

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1615-6110

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Meiotic behavior and pollen morphology variation i

Authors: Gisela M Via do Pico Massimiliano Dematteis
Publish Date: 2010/09/14
Volume: 290, Issue: 1-4, Pages: 99-108
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Abstract

Centaurium pulchellum is an annual herb native to Europe but introduced in South America where it is widely used in the preparation of digestive infusions and bitter drinks In this species a wide variation in the aperture pattern of pollen grains was reported and has been attributed to environmental factors or irregularities at meiosis For this reason cytological and palynological studies have been undertaken on two different populations The pollen grain analysis showed that some types are more frequent within each population but the most common forms were the typical 3colporate and 4colporate The cytological analysis revealed that the analyzed populations of C pulchellum have chromosome number 2n = 36 The presence of tetravalents at meiosis strongly suggests that these populations are autotetraploid based on x = 9 The meiotic behavior showed a significant percentage of irregularities in different phases offplate bivalents precocious segregation laggard chromosomes bridges and cytomixis However these irregularities are not related to the variation in the aperture pattern of pollen grains The heteromorphism in the pollen grains observed in C pulchellum could be a normal condition to which the species is well adapted

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