| 单词 | genetic spiral |
| 释义 | > as lemmasgenetic spiral genetic spiral n. Botany the line joining successive points of insertion in a spiral pattern of phyllotaxis. ΚΠ 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 169 A line is imagined proceeding..in such a direction that, traversing the axis..it includes the points of insertion of all the successive lateral members according to their age; the horizontal projection of this line is called the Genetic Spiral; in reality it is a helix running round the stem more or less regularly. 1928 Amer. Naturalist 62 220 Quincuncial [leaf arrangement], i.e. the sixth leaf immediately above the first, the genetic spiral passing twice around the stem between the first and sixth. 1996 New Phytologist 132 200/2 All patterns are claimed to be derived from a set of multijugate patterns subcategorized by their jugacy J:J representing the number of genetic spirals and/or the number of leaf primordia at the same level on the apex. < as lemmas |
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