400 



GROWTH FACTORS AND FLOWERING 



2 00 



13 



z 



B A 



LEAF POSITION 



Fig. 6. Average lengths of leaf pairs A and B (the oldest, largest leaves 

 in the apical bud at the start of the experiment) when leaf pairs 1-4 have 

 been excised and petioles 5-8 have intact leaves, lanolin, or 1% indole- 

 acetic acid in lanolin (after 21 days.) (Data in Table III.) 



apical bud in reducing the compensatory growth of leaves 5 and 6 

 (experiment run twice).] 



Day Length Effects 



When plants were placed under long-day (LD) or short-day (SD) 

 conditions, with axillaries either excised or left intact, results with 

 respect to flowering were as shown in Table I. In B3 the natural day 

 length was prolonged to 14 hr for long day, reduced to 8 hr for short 



Table III. Average Lengths (in mm ± Standard Error) of Leaves A and B in 



Plants with AH Leaves 1-4 Excised and with Indicated Treatments at Nodes 5-8 



(after 21 days of treatment; n = 14 in each case) 



Treatment on Petioles 5-8 



" Signifies a statistically highly significant difference, by the / test, between the marked 

 average and the average for the same leaf position in the central column. 



