| 释义 |
phytochrome|ˈfaɪtəkrəʊm|
[f. phyto- + chrome n.]
1. (See quot.)
1893Syd. Soc. Lex., Phytochrome, a name for chlorophyll. 1902Webster Suppl., Phytochrome, yellow pigment of plants.
2. Bot. A blue-green chromoprotein which regulates many aspects of development in higher plants according to the nature and timing of the light which it absorbs.
1960Borthwick & Hendricks in Science 28 Oct. 1223/1 This control of flowering..implies a time-measuring system that distinguishes between light and darkness through mediation of a pigment... The pigment, now called phytochrome, is a blue or a bluish-green protein that exists in two forms interconvertible by light,..with 660 and 730 mµ the absorption maxima of the two forms. 1962Amat. Gardening 20 Jan. 12 Phytochrome has been isolated, and shown to be sensitive even to very short periods of light. 1971New Scientist 18 Feb. 365/1 One of the ‘states’ of phytochrome is physiologically active and plays a part in controlling many processes ranging from seed germination..to the onset of reproductive behaviour. 1977J. L. Harper Population Biol. Plants v. 144 The phytochrome system which controls the light sensitivity of germination in many species involves an interconversion of two forms of phytochrome. |