title: Lack of incorporation of tritiated uridine by nuclei of mature sieve elements in Metasequoia glyptostroboides and Sequoiadendron giganteum.
abstract: The majority of nuclei which persist in "mature" sieve elements of Metasequoia glyptostroboides Hu and Chen and Sequoiadendron giganteum Buchholz fail to incorporate tritiated uridine (10 μCi/ml; 7 hours incubation of stem fragments). This is interpreted as further evidence for the degenerated condition of these nuclei.
authors.affiliation: Université des Sciences et Techniques du Languedoc, Place E. Bataillon, 34060, Montpellier cédex, France.
authors.forename: C
authors.initials: C
authors.lastname: Hébant