Use of Growing Degree Days to Time Root Developmental Events in the Gramineae
Root development can be related to shoot development in cereals such as winter wheat (Triticum aestivum L.). Individual root axes can be seen to arise from specific nodes and can be identified using a naming system that relates the axis to a node and to a direction of growth with respect to that node. Aphyllochron system can then be used to relate the appearance of specific seminal and crown root axes to main stem leaf number. The general pattern of root axis appearance for grasses is therefore predictable based on a growing degree day (heat unit) calculation and specific root axes are observable at specific points in shoot development. This pattern can be generalized from wheat to other grasses for use by modellers and morphologists.
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