| 单词 |
protocorm |
| 释义 |
ˈprotocorm Bot.
[ad. F. protocorme (M. Treub 1890, in Ann. Jard. Bot. Buitenzorg VIII. 30), f. proto- + corm2.]
A tuber-like body produced in the seedling stage of certain pteridophytes and orchids which grow in association with mycorrhiza. Also attrib.
1891F. O. Bower in Proc. R. Soc. L. 267 The sporophyte [of Phylloglossum] consists of two parts:—(i) the protocorm, with its protophylls and roots, and (ii) the strobilus. 1905I. B. Balfour tr. Goebel's Organogr. Plants II. 232 The chief mass of the seedling [of orchids] is formed of the ‘protocorm’. 1938G. M. Smith Cryptogamic Bot. II. vii. 180 A massive globose structure (the protocorm)..grows through the gametophyte. 1959S. Shushan in C. L. Withner Orchids iii. 53 Continued enlargement of the embryo, which can henceforth be called the protocorm, results in either a smooth or irregular globular mass of cells. 1962K. R. Sporne Morphol. Pteridophytes iv. 64 The protocorm might well be regarded as a derivative and retrograde development. 1967New Scientist 14 Sept. 551/1 By subculturing every few weeks, protocorm formation may be kept going indefinitely. 1977J. Arditti Orchid Biol. 211 Within 4–6 months, a mass of protocorms is formed. |
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