|
|
Rozšíření a diverzita \kur{Huperzia selago} agg. v Evropě
KREJČÍ, Joel
Genome size variation of the Huperzia selago group was studied. Six cytotypes with different altitudinal and latitudinal distribution were found. Morphometrical analyses revealed several characters that can be used to distinguish the cytotypes with higher or lower success rate. Morphological variation was even found within some cytotypes. The cytotypes cannot be matched with the taxa distinguished in Europe (H. selago, H. appressa, H. continentalis and H. arctica) as morphological characters used to identify these taxa in literature fail to identify the cytotypes.
|
|
|
Evaluation of cytotype and morphological variability and hybridization rate in water-milfoils (Myriophyllum) in the Czech Republic and adjacent territories
Hrdinová, Magdalena ; Trávníček, Pavel (advisor) ; Koutecký, Petr (referee)
Myriophyllum L. (watermilfoil) belongs to one of the most invasive genus of the Northern Hemisphere. The three most agressive species, one of which is native to Europe (M. spicatum), are widespread throughout the majority of United states and two of them (M. aquaticum and M. heterophyllum) are becoming invasive in several Europaean countries as well. Therefore, Europaean populations of both native and invasive species, represents ideal place where to study processes which account for watermilfoils' invasivness. In this study, flow cytometry, morphometric analyses and germination experiments were employed to evaluate cytotype and morphological variability of Myriophyllum along with its potential to hybridize and propagate generatively. Five ploidy levels were detected in Europe, however no ploidy variability has been found within any species except for M. sibiricum (hexaploids and nonaploids) and one population of M. aquaticum (hexaploids and oktoploids). Flow cytometry proved to be useful tool for purposes of distinguishing species of different ploidy level and their potential hybrids. Nevertheless, the key species - M. sibiricum and M. spicatum - among which probably even more aggressive hybrids were recently identified, have similar hexaploid level. Thus flow cytometry cannot facilitate...
|
|
|
Evaluation of cytotype and morphological variability and hybridization rate in water-milfoils (Myriophyllum) in the Czech Republic and adjacent territories
Hrdinová, Magdalena ; Trávníček, Pavel (advisor) ; Koutecký, Petr (referee)
Myriophyllum L. (watermilfoil) belongs to one of the most invasive genus of the Northern Hemisphere. The three most agressive species, one of which is native to Europe (M. spicatum), are widespread throughout the majority of United states and two of them (M. aquaticum and M. heterophyllum) are becoming invasive in several Europaean countries as well. Therefore, Europaean populations of both native and invasive species, represents ideal place where to study processes which account for watermilfoils' invasivness. In this study, flow cytometry, morphometric analyses and germination experiments were employed to evaluate cytotype and morphological variability of Myriophyllum along with its potential to hybridize and propagate generatively. Five ploidy levels were detected in Europe, however no ploidy variability has been found within any species except for M. sibiricum (hexaploids and nonaploids) and one population of M. aquaticum (hexaploids and oktoploids). Flow cytometry proved to be useful tool for purposes of distinguishing species of different ploidy level and their potential hybrids. Nevertheless, the key species - M. sibiricum and M. spicatum - among which probably even more aggressive hybrids were recently identified, have similar hexaploid level. Thus flow cytometry cannot facilitate...
|
guest ::
