ploidy in the north

Mon, 16 Feb 2004 01:17:09 PST
I think too that in  general plants in the north tend to have more 
polyploids Saying so one compares genera not individual species. 
This may have to do with the fact that in warmer climates there is 
more compitition for fast grow and any surplus DNA is a burden 
then On the contrary in the north plants often divide their time in a 
period with increasing celle numbers and a period with increae in 
size of these cells. Most big narcissi, tulips Hippeastrums are 
tetraploids I suppose they were not only chosen for the increased 
flower size but also for increases  in hardiness, This latter not 
compared to other species but compared with their diploid parent.
Ben J.M.Zonneveld
Institute of Biology,Leiden University, Clusius lab 
Wassenaarse weg 64, 2333 AL Leiden, The Netherlands
Fax: +31-71-5274999. min temp -10C (15F)

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