Acta Botanica Croatica, Vol. 32 No. 1, 1973.
Izvorni znanstveni članak
Morphological and Cytotaxonomic Investigations of Helleborus multifidus Vis.
Zlatan Martinis
; Hrvatska
Željka Lovašen-Eberhardt
; Hrvatska
Sažetak
1) The topoclinal geographical distribution of leaflet forms of basal leaves of Helleborus multifidus was established and it was found that the leaflet number gradient increases in the direction northwest-southeast. In the area where subsp. laxus is widely distributed, in the north- -west part of Yugoslavia, oligofid and normofid leaves dominate; in the area of Istra, Kvarner and Gorski Kotar, where subsp. multifidus is widely distributed, the normofid forms are prevalent, while in the area where subsp. intermedius is widely spread, polyfid and multifid forms dominate.
2) The domination of one particular leave form in the populations of certain geographic areas is constant, i. e. it does not change in culture under the same ecological conditions. This fact confirms the taxonomic value of this morphologic characteristic.
3) The chromosome number 2n = 20 + 1 — 4B, and 2n = 30 + 1— 11B was determined. The karyogram of Helleborus multifidus was variable because of a change in the number of metacentric and SAT chromosomes.
4) Two types of B chromosomes were determined in populations: the acrocentric ones with a satellite, which predominated, and very small metacentric ones, which occurred in some populations only. Very rarely both types of B chromosomes were found in a population.
Ključne riječi
Hrčak ID:
157245
URI
Datum izdavanja:
31.12.1973.
Posjeta: 900 *