| 释义 |
diplobiontic, a. Biol.
Brit. |ˌdɪplə(ʊ)bʌɪˈɒntɪk|, |ˌdɪplə(ʊ)bɪˈɒntɪk|, U.S. |ˈˌdɪploʊˌbaɪˈɑn(t)ɪk|, |ˈˌdɪploʊˌbiˈɑn(t)ɪk|
[‹ diplo- comb. form + -biont comb. form + -ic suffix, after German diplobiontisch (N. Svedelius 1915, in Nova Acta Regiae Societatis Scientarum Upsaliensis 4 iv. 43). Compare haplobiontic adj.]
Designating a plant or fungus whose life cycle involves alternation of generations between two distinct free-living types (which may be either haploid or diploid).
1916Amer. Naturalist 50 511 Svedelius proposes the term haplobiontic for red algae with this type of life history to be contrasted with diplobiontic forms..where the gonimoblasts have been shown to be diploid in character and chromosome reduction finds its place in the tetrasporangia of an asexual generation. 1940Bot. Rev. 4 22 Saccharomyces ellipsoideus is diplobiontic but only to the extent that ascospores germinate and form a number of rather small round budding cells; later, some of these cells fuse in pairs. From here on the budding yeast cells are larger and more ellipsoid. 1993Eur. Jrnl. Phycol. 28 73/1 The freshwater populations of R. hieroglyphicum studied..provide clear evidence of the existence of a diplobiontic isomorphic life history.
Derivatives. diplobiont n. a diplobiontic plant or fungus.
1927N. Svedelius in Bot. Gaz. 83 380 From the point of view of alternation of generations, it may be conceived that plants equipped with sexual reproduction have developed, broadly speaking, from haploid single organisms, haplobionts,..to haploid and diploid double organisms, *diplobionts. 1969T. Levring in T. Levring et al. Marine Algae 101 Most of the Nemalionales are haplobionts, but also diplobionts are known. |