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plastochron
The plastochron (or plastochrone) index and the leaf plastochron index are ways of measuring the age of a plant dependent on morphological traits rather than on chronological age. Use of these indices removes differences caused by germination, developmental differences and exponential growth.
==Definitions==
The spatial pattern of the arrangement of leaves is called phyllotaxy whereas the time between successive leaf initiation events is called the plastochron and the rate of emergence from the apical bud is the phyllochron.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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