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Nuclear DNA Amounts in Macaronesian Angiosperms: Insights and Future Directions

This study presents an analysis of nuclear DNA amounts in Macaronesian angiosperms, involving 241 species covering a significant portion of the endemic flora. A total of 31 endemic genera were examined, highlighting a predominance of very small to small C-values, with 83% of analyzed taxa falling under very small categories. The results indicate a recent diversification trend, influenced by environmental factors such as altitude and rainfall. Future studies aim to explore DNA variation in Hawaiian and Galapagos archipelagos, enhancing our understanding of plant evolution in isolated ecosystems.

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Nuclear DNA Amounts in Macaronesian Angiosperms: Insights and Future Directions

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  1. Nuclear DNA amounts in Macaronesian Angiosperms Jan Suda Department of Botany, Faculty of Science, Charles University Institute of Botany, Academy of Sciences of the Czech Republic

  2. B a s i c d a t a

  3. M a c a r o n e s i a n f l o r a Total number of species: ca 2 500 Endemic species: ca 600 Endemic genera: ca 31 - high proportion of woody life-forms - many taxa succulent - low frequency of geophytes, annuals - recent diversification (adaptive radiation, vicarization, inter-island differentiation)

  4. F C M a s s a y s

  5. 241 species (40 % of the endemic flora) R e s u l t s

  6. very small small intermediate C - v a l u e s c o m p a r i s o n very small (< 1.4 pg) small (1.4 1- 3.5 pg) intermediate (3.51 - 14 pg) large (14.01 - 35 pg) very large (> 35.01 pg)

  7. Endemic genera Total: 31 Analyzed:23 (74 %) Assumed: +4 (87%) Very small C-values:19 (83%) Assumed: +2 (78%) Small C-values:1 (4%) Assumed: +1 (7%) Intermediate C-values:3 (13%) Assumed: +1 (15%) C - v a l u e s c o m p a r i s o n Database Macaronesia Min 0.17 0.19 Max 127.4 9.52 Range 750 50 Mean 6.34 1.97 Median 2.9 1.02 Mode 0.55 0.51 n 3478 241

  8. 13.94 13.77 13.69 14.14 14.18 14.28 14.41 Correlation with environmental conditions Altitude Rainfall Temperature Argyranthemum(n=7)- - + Silene(n=4) (-) - + Micromeria(n=4)(-) - + Crambe(n=4)+ + - Sonchus(n=3)+ + -

  9. W h e r e f i n d m o r e . . . Suda J., Kyncl T. & Freiová R. (2003): Nuclear DNA amounts in Macaronesian Angiosperms. – Annals of Botany 92/1: 153-164. Suda J. & Kyncl T. (xxxx): Nuclear DNA amounts in Macaronesian Angiosperms - forty percent of the endemic flora finished (in prep.) Suda J. (xxxx): Macaronesian angiosperms: selection towards very small genomes (in prep.) Future intentions: Comparative study of plant C-value variation in Havaiian and Galapagos archipelagos

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