Abstract
This paper examines the hypothesis that leaf number visible at floral initiation (LN n) and final leaf number (FLN) are correlated in sunflower ( Helianthus annuus L.). The relationship between these variables is described by a model that takes into account the rate of leaf primordium initiation (RPI), the rate of leaf appearance (RLA) and time from emergence to floral initiation (FI). Data from glasshouse and field experiments were used to test the model. Combination of eight hybrids and four inbred lines and and wide range of growing conditions yielded values from 4 to 20 for LN n and from 12 to 42 for FLN. The observed relationship between LN n and FLN was in good agreement with the theoretical model. A constant RLA:RPI ratio underlies the association between LN n and FLN, and suggests that leaf initiation and appearance are co-ordinated processes. The relationship LN n and FLN is proposed as a non-destructive method to estimate the time of FL.
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