| 单词 | plastochron ratio |
| 释义 | > as lemmasplastochron ratio plastochron ratio n. the ratio between the length of successive leaves in the apex of a growing shoot. ΘΚΠ the world > plants > botany > [noun] > ratio or index of development of shoots plastochron ratio1948 plastochron index1955 1948 F. J. Richards in Symp. Soc. Exper. Biol. 2 226 The differences between the various orders of phyllotaxis have been referred to differences in the ratio of the distances of two successive primordia from the apical centre... The ratio will be referred to as the ‘plastochrone ratio’. 1980 Sci. Amer. May 112/3 When the lengths of successive leaves are measured..it is found that the ratio of the length of a leaf to the length of the next-youngest one is reasonably constant for leaves that are growing rapidly. This relation can be called the plastochron ratio, and can be interpreted as the ratio by which a typical leaf increases in length per plastochron. < as lemmas |
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