The shortening effect of PGRs on sunflower plants observed in the
present study was due to the reduction of the internode length, because the
number of stem nodes was not affected by the chemical treatments (Table
1). These results are in agreement with those of Lovett and Campbell
(1973), who reported a reduction in the internode length of sunflower
plants after application of CCC. Scarisbrick et al. (1985)