results to this experiment such as Rattanapan
(2001) who studied Curcuma longa Linn. and
found that normal plants had more vigor than
polyploid plants. In watermelon, tetraploids had a
bigger and thicker seed coat than normal plants but
produced smaller amounts of seed and lower yields
than normal plants (Sinchai, 1978). However, these
tetraploid plants were grown by budding onto
normal plant rootstocks, Therefore, the growth
of the tetraploid plant might have been controlled
or infl uenced by the rootstock which itself was of
higher vigor than the tetraploid. Thus, own-root
propagation such as by air layering or stem cutting