By Harms, V.L.

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Extra resources for Checklist of the vascular plants of Saskatchewan and the provincially and nationally rare native plants in Saskatchewan: including important synonyms, authorities, common names, and various status indicators

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Philadelphicus (Figs. 6 and 7). Presently resistance has been observed in four 38 K. Itoh and S. Matsunaka (X) SI oo 100 Susceptible

2). Darwin also noted the existence of major mutations, but these are not comparable to the mutations presently known, since Darwin's 'Origin of Species' (1859) was allele frec ^- c V ISOLATION BARRIERS abortion Fl low fitness/sterile auto7cleistogamy vegetational prop. apomixis sporophytic gametophytic gametic hybridisation V ,irregular meiosis chromosome mutations polyploidy aneuploidy dysploidy Fig. 2 Schematic representation of evolutionary processes and their relationship to isolation barriers.

Knowledge of isolation barriers is important in an opposite direction. The existence of strong isolation barriers alone, prevents the transfer of pollen from 4 Biosystematics of Cultivated Plants 53 BIOSYSTEMATICS 1 living plant collection 2 identification 3 research of: morphology chromosomes plant geography ecology chemicals DNA crossability 4 synthesis 5 classification : time t ■=£> relationship Fig. 1 A review of the different stages of biosystematic research, of the multidisciplinary approach and of a classification tree with four taxa in three groups.

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