Cytophotometric estimation of in situ DNA content in several species of Araceae.

A wide variation in the in situ 4C DNA content, ranging from 15.02 pg to 54.09 pg was found in thirteen genera of the family Araceae. The obligate perennial species showed greater 4C DNA values compared with the facultative perennials and annuals. A remarkable heterogeneity in 4C nuclear DNA amounts was noted among obligate perennials. Intraspecific constancy in the amount of 4C DNA was recorded. The nuclear DNA content correlated positively with chromosome size, duration of the mitotic cycle, and annual to perennial growth forms. Despite an extensive variation in DNA content among the aroids investigated, each species was distinctly characterized by its specific nuclear DNA value, indicating its usefulness in taxonomic characterization and comparison of different aroids.