| 释义 |
heterogamous, a.|hɛtəˈrɒgəməs|
[f. Gr. ἑτερο- hetero- + γάµ-ος marriage + -ous: in mod.F. hétérogame (De Candolle).]
1. Bot. Variously applied to conditions in which stamens and pistils are not regularly present in each flower or floret.
Applied a. orig. by De Candolle to plants having flowers monœcious, diœcious, or polygamous; b. by Lessing to composites whose capitula or flower-heads contain florets differing in sex; c. by Trinius to grasses in which the arrangement of the sexes is different in different spikelets.
1839J. Lindley Introd. Bot. (ed. 3) i. ii. 157 If all the flowers are hermaphrodite in the capitulum, it is homogamous; if the outer are neuter, or female, and the inner hermaphrodite, or male, it is heterogamous. 1842in Brande. 1866Treas. Bot., Heterogamous, when in a capitulum the florets of the ray are either neuter or female, and those of the disk male. 1872Oliver Elem. Bot. ii. 196 If all the florets of a flower-head (capitulum) be perfect, the flower-heads are homogamous (Dandelion); if part of them be imperfect, the heads are heterogamous (Daisy).
2. Biol. Characterized by the alternation of differently organized generations, as of a parthenogenetic and a sexual generation.
1897Allbutt Syst. Med. II. 1031 Certain species [of Nemathelminthes] possess what is known as the ‘free rhabditis form’ and are heterogamous.
3. Of or pertaining to irregular marriage.
1862M. Hopkins Hawaii 159 Besides these he may have had other heterogamous connexions.
4. Biol. Involving, having the character of, or producing heterogametes.
1895J. R. Green Man. Bot. I. i. ii. 215 The smaller are held..to be male, and the larger female. Plants with such gametes are called heterogamous. 1900Ann. Bot. XIV. 662 The union of heterogamous walled aplanogametes. 1925E. B. Wilson Cell (ed. 3) vii. 593 In true heterogamous forms the macrogamete becomes a large, non-motile cell. 1957H. C. Bold Morphol. Plants iii. 55 These plants are the male and female gametophytes which liberate the heterogamous gametes at maturity. 1969G. W. Prescott Algae i. 42 Sexual reproduction may include isogamous, anisogamous, or heterogamous methods, with or without special sex organs. |