Fig. 1

The position of ink marks (a) and representative growth of short (b) and long celery petioles (c). a Shows a celery leaf with a long petiole marked at 0.5 cm interval with a black marker. The mark position (right side number) was set from upper to lower segments of celery petiole. b and c show the interval lengths from the long (7.5 cm) and short (3.3 cm) petioles after Day 1 (marking day) ; Day 5 ; Day 13 ; Day 21 ; Day 28 ; Day 36 ; Day 50 . These are representative petioles; a total of 13 short and 13 long petioles were studied