| 释义 |
protandrous, a.|prəʊˈtændrəs|
[ad. G. protandrisch (F. H. G. Hildebrand Die Geschlechter-Vertheilung bei den Pflanzen (1867) 17), f. proto- + -androus.]
1. Bot. = proterandrous; opposed to protogynous.
1870A. W. Bennett in Jrnl. Bot. VIII. 317 (heading) Protandrous. 1875Bennett & Dyer Sachs' Bot. 812 Dichogamous Flowers are either protandrous or protogynous. 1880Gray Struct. Bot. vi. §4 (ed. 6) 219 Dichogamous flowers are Proterandrous (or Protandrous), when the anthers mature and discharge their pollen before the stigma of that blossom is receptive of pollen. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. 602 Many apparently protandrous flowers..were borne in the axils of the dead leaves.
2. Zool. = proterandrous a. 2.
1897Parker & Haswell Textbk. Zool. I. vi. 285 A few forms [of Nematoidea] are hermaphrodite, but, instead of having a double set of reproductive organs, as in Platodes, organs of the ordinary female nematode type are present, and the gonads produce first sperms and afterwards ova. Such animals are said to be protandrous (male products ripe first). 1929Amer. Naturalist LXIII. 571 The lengths of males [of Pandalus danae Stimpson] indicated that they were in two year-groups... On the other hand the females seemed to belong to a third year-group... This appeared to suggest that the form under consideration was protandrous. 1973Nature 5 Oct. 262/2 Both protandrous and protogynous hermaphroditism have been reported in fishes, and there is some evidence that smaller and younger specimens of U[mbra] limi are predominantly males, while larger and older individuals are mostly females.
So proˈtandric a. = protandrous (Cent. Dict. 1890); proˈtandrism (Webster 1890), proˈtandry = proterandry: opposed to protogyny.
1870[see protogyny]. 1887Bergens Museums Aarsberetning vii. 29 It may not be amiss to draw a comparison between the protandric hermaphroditism of Myxine and the hermaphroditism of the few other hermaphroditic vertebrates known. 1892J. A. Thomson Outl. Zool. 632/2 (Index), Protandry of Myxine. 1897Willis Flower. Pl. & Ferns I. 87 When the pollen is ripe before the stigma..termed protandry. 1932Proc. 6th Internat. Congr. Genetics II. 26 Several of the oviparous species show a large percentage of intersexuality when young, with a strong tendency toward protandry. Ibid. 27 This species is regularly protandric, each young animal producing many thousands of sperm balls. 1951[see gonochoric adj. s.v. gono-]. 1970Nature 11 July 189/2 Gross examination of gonads in larger males and smaller females showed no evidence of protandry. 1975Ibid. 15 May 221/2 He considered it likely that A. equina is a protandric hermaphrodite which mainly self-fertilises and retains larvae within the parent. |