Parallel polymorphism in the heterochromatin of Trillium species

Heterochromati in American and Japanese Species of <i>Trillium</i>

“…2 Seven species , including T. rivale which has very little heterochromatin, are known to possess supernumeraries. This does not support the suggestion of Darlington and Shaw (1959) that the presence of H-segments and of supernumeraries is positively correlated. Their observation that supernumeraries are absent from T. stylosum but present in 5 other species from the same area, could equally well be correlated with the fact that the latter, unlike T. stylosum, were collected at the edge of the species range (map, Fig.…”

“…These segments may differ in length, while the degree of contraction is the same. In addition to the segments in B and D short arms and in C long arm of several species as described by Darlington and Shaw (1959), this variation was also seen in A and B long arms in T. erectum and E long arm in T. grandiflorum. In some of these, large increases in the length of underspiralised H-segments at corresponding loci were associated with a slight decrease in the length of euchromatin in the same arm (Table 1).…”

Heterochromatin in American and Japanese Species of <i>Trillium</i>, III

“…The H-patterns for these plants are not known precisely, but all T. cernuum individuals have a large H-segment in D. s. which is absent from the other species, and a larger segment on B. s. than is usually found in T. grandiflorum (Darlington and Shaw 1959).…”

Cytology of Some Variegated Forms ofTrillium Grandiflorum(Liliaceae)

“…The five chromosomes in the genome are designated as A, B, C, D and E (DARLINGTON and SHAW 1959). The karyotype morphology of the chromosomes is essentially similar in all the normal and abnormal forms studied.…”

“…HooPER et al ( 1971) found mycoplasma-like organisms within the phloem cells of such plants and concluded that variegation and associated abnormalities in the species should be regarded as a pathological condition. Extensive studies on the cytology of several species of Trillium have been conducted by various workers (WILSON and BooTHROYD 1944;RUTISHAUSAR 1956;DARLINGTON and SHAW 1959;DYER 1964;SEROTA and SMITH 1967;CHINNAPPA and MoRTON 1978;FuKUDA and GRANT 1980). However, detailed cytology of the aberrant forms of T. grandiflorum has not been investigated.…”