| Summary: | Paclobutrazol is a kind of plant growth regulators used to suppress plant growth. Its
plant regulator could inhibit the synthesis of gibberellins. The application of paclobutrazol in
a particular concentration on chrysanthemum has potential on the formation of
chrysanthemum pots. The aim of the research was to study the effect of paclobutrazol on the
stems and leaves anatomy and anthocyanin content of chrysanthemum (Chrysanthemum
spp.). This research was also determine the optimum concentration of paclobutrazol on
growth and morphology of plants potted chrysanthemums. The plant variety used were
Jaguar red, Snow white and Fiji white. Research was carried out by the application of
paclobutrazol concentrations of 0, 50, 100, 150 ppm once in a week for 3 times on three
varieties of chrysanthemum. After 8 week growing, the stem and the leaf were prepared for
anatomical observation using free hand section and embedding method. Moreover, the
chlorophyll content in the leaf and anthocyanin content in the flower were also tested using
spectrofotometri. The results showed that the concentration of 150 ppm paclobutrazol
increased leaves thickness and stems diameter, as well as the diameter of the trachea.
Concentration of 100 ppm paclobutrazol increased cell size of guard cell, palisade and
spongy tissue and peripheral tissues. While the concentration of 50 ppm paclobutrazol effect
on increasing the number of stomata and pith diameter. Giving to the concentration of 150
ppm paclobutrazol could increased levels of anthocyanin in the all flower varieties. The
optimum concentration of paclobutrazol to form a potted chrysanthemum was 150 ppm.
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