Chromosomal Changes Observed in Natural Populations of <i>Paris tetraphylla</i> A. Gray

C-band polymorphism in the karyotype of Paris tetraphylla A. Gray (Liliaceae).

“…Moreover, the plants carrying supernumerary Bs showed no clear morphological differences from the plants without Bs. Kurabayashi 1952, Kurabayashi and Samejima 1953, and Noda 1963 studied differential reactivity of the specific chromosome segments of P. tetraphylla under conditions of chill and found that only the distal half of short arm of the chromosome C exhibits a differential reaction. On the other hand, there is no doubt that the cold-sensitive regions of Adoxa (Greilhuber 1979), Fritillaria (Schweizer 1973) be more adaptive or preferable for this species.…”

“…In one popula tion vegetative reproduction or self-fertilization may predominate , while cross-fertilization may serve as the main breeding system in other populations . Kurabayashi and Samejima 1953 examined 128 plants collected from 6 localities near Sapporo , Hokkaido, and found that all the individuals belonging to the same group had identical chromosomal constitutions . Futher, in a large population, Maruyama-B , 93.2% of the plants were in a homozygous condi tion.…”

“…The standard karyotype consists of three pairs of metacentric chromosome, a pair of submetacentric chromo some and a pair of acrocentric chromosome with a satellite on its small arm. Moreover, some heterochromatic regions were detected in chilled chromosomes (Kurabayashi 1952, Kura bayashi and Samejima 1953, Noda 1963.…”

“…While within the typical form tetraphylla evident morphological geocline in folial and floral organs was reported (Hara andKanai 1958, Kawano et al 1980). The cytology of this species was studied by some authors and reported as 2n=10 (Gotoh 1933, Haga 1934, 1942, 1961, Stow 1935, Kurabayashi 1952, Kurabayashi and Samejima 1953, Kura bayashi et al 1958, Kayano 1961, Noda 1963, Suzuki and Yoshimura 1985. However, in some plants 4 to 7 B-chromosomes were observed (Haga 1961, Kayano 1961.…”

Cytogenetic Structure and Breeding System of Natural Populations of Paris tetraphylla A. Gray.

“…In earlier studies, it was found that vegetative apomixis occurred as a natural condition of this species (Kurabayashi and Samejima 1953). On the other hand, Miyamoto and Kurita (1990) showed that vegetative reproduction or self-fertilization might be predominant in one population, while cross-fertilization was the main breeding system in other populations based on an analyses of the Cbanded karyotypic structure.…”