| 释义 |
pseudogamy Biol.|sjuːˈdɒgəmɪ|
[ad. G. pseudogamie (W. O. Focke Pflanzen-Mischlinge (1881) vii. 510): see pseudo- and -gamy.]
a. In an apomictic plant, development of an embryo following pollination without fertilization.
1900B. D. Jackson Gloss. Bot. Terms 213/2 Pseudogamy, parthenogenetic fruiting, as pollination without impregnation of ovules. 1908Ann. Bot. XXII. 42 Humaria rutilans is..an example of the so-called apogamous development of the ascocarp, or pseudogamy. 1956Nature 21 Jan. 141/2 A third group of populations [of Culex pipiens] is interfertile with the others in one direction only. Parthenogenesis, with pseudogamy, predetermination and multiple compatibility genes can be excluded as causative mechanisms. 1974New Phytol. LXXIII. 1243 Pseudogamy is a type of agamospermic reproduction in which seed development is stimulated by pollination although the male nucleus does not fuse with the egg. 1976Bell & Coombe tr. Strasburger's Textbk. Bot. (rev. ed.) 403 In many angiosperms embryos develop from diploid unfertilized egg-cells (parthenogenesis and angiospermy..), but sometimes this development requires the stimulus of pollination (pseudogamy).
b. The fusion of two vegetative nuclei.
1907Annales Mycologica V. 422 Fusion of two vegetative nuclei: pseudogamy. 1928C. W. Dodge tr. Gäumann's Compar. Morphol. of Fungi iv. 13 The sexual processes occurring outside in the thallus between two sexually differentiated vegetative cells..called pseudo⁓mixis (pseudogamy of Hartmann). Ibid., Since the copulating cells are not morphologically distinguished from other vegetative cells and since only the release of specific developmental stimuli..marks this anastomosis of two vegetative cells as a sexual process, pseudogamy is often distinguished with difficulty from the usual pseudo⁓sexual anastomoses which are brought about by food relations.
Hence pseuˈdogamous a.
1932C. D. Darlington Rec. Adv. Cytol. xv. 434 Moderate or even high pollen fertility is sometimes found in the pseudogamous Potentilla species. 1964W. Williams Genetic Princ. & Plant Breeding viii. 290 Hybrid endosperms in pseudogamous apomicts derived from crosses between unrelated parents promote stronger growth in apomictic seedlings. 1974New Phytol. LXXIII. 1246 The three pseudogamous species..would set seed when pollinated by each other or intraspecifically, but not when pollinated by any of quite a large selection of different Potentilla species. |