| 单词 | plastochron index |
| 释义 | > as lemmasplastochron index plastochron index n. an index for measuring the developmental age of a shoot, based on the number of leaves that are not less than some stated length, plus a fractional adjustment so calculated that the value of the index changes smoothly as the shoot grows. ΘΚΠ the world > plants > botany > [noun] > ratio or index of development of shoots plastochron ratio1948 plastochron index1955 1955 F. J. Michelini (title of Ph.D. diss., Univ. of Pennsylvania) The use of the plastochron index in studies of morphological and physiological development in Xanthium italicum Moretti. 1980 Sci. Amer. May 113/1 The plastochron index..is a continuous developmental scale that can be employed to draw conclusions indirectly about the growth of the apical meristem of the shoot..when direct observations are not feasible. < as lemmas |
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