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Microsporogenesis and meiotic behavior in nine species of the genus Pinus
Ist Teil von
Journal of systematics and evolution : JSE, 2009-07, Vol.47 (4), p.287-290
Ort / Verlag
Malden, USA: Blackwell Publishing Inc
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
The meiotic behavior of 10 taxa （nine species and one variety） of the genus Pinus was investigated using pollen mother cells （PMCs） to reveal the differentiation among karyotypes. Chromosome spreads were prepared by conventional squashing. The meiotic index and the average configuration were higher, whereas the frequency of aberrance （chromosomal bridges, fragments, or micronuclei） was lower, in all 10 taxa compared with other gynmosperms. The meiotic index, average configuration, and frequency of irregularity were found to be uniform among the species. It was shown that the genomes of the Pinus species investigated were highly stable, confirming results of previous mitotic analyses in this genus. However, slight differentiation of homologous chromosomes among genomes was revealed by analysis of meiotic configurations in Pinus nigra var. poiretiana. Quadrivalents were observed in 9.31% of PMCs in this species. This is the first time that quadrivalents have been observed in gymnosperms.