| Zamioculcasz amiifolia is a snow Colocasia Araceae, its compound leaves is like a string of gold. It is currently the most popular advanced indoor foliage plants. Plant growth retardant is a kind of compounds which is able to retardant plant-growth, shorten the lengths of internodes, strongthen stems, dark green, thicken leaf, increase branch, rich root, enhanced resistance, and it was been widely applied in crop, vegetable, fruit trees, forest trees, flowers.but the effects on different plants were different, meanwhile, the different medicine type, concentration and treatment had different effects on the same plants, and now there is no reports on Plant-growth retardant applying in Zamioculcasz amiifolia. This paper compare and analyze the effects of different medicine type(paclobutrazol PP333, uniconazole S3307, chlorcholinchlorid CCC), approaches(spraying and pouring),ages(one, two and three years) on the test, ascertain the effects of plant growth retardant on cold resisitance of Zamioculcasz amiifolia in the southern nursery of the national forest tree seedling.The effects of three plant growth retardants (PP333, S3307 and CCC) and two methods of application (foliar spray and root drench) were studied on Zamioculcasz amiifolia plants of ages one, two and three years. Results shows that,(1) PP333 and S3307 both significantly inhibited growth and their effects increased as the concentration applied increased. However, CCC did not significantly inhibit growth.(2) PP333 reduced the average total length of leaf stalks, minimized the length petiolules (i.e. the stalk between leaflets); shortened and thickened the petioles and also reduced the comparative growth speed of compound leaves. In contrast, the main effects of S3307 were on shortening and thickening petioles.(3) The optimal concentration of PP333 at different ages of Z. amiifolia varied with individual plant biomass.(4) Overall, the best control growth control of one-year-old Z. amiifolia plants was obtained with 300 mg-L-1 of S3307 applied as a foliar spray; of two-year-old plants with 300 mg-L-1 of S3307 or 600 mg-L-1 of PP333 applied as root drench; and, of three-year-old plants with 1200 mg-L-1 of PP333 applied as foliar spray.Studies were conducted on leaf growth in winter and cold resistance of Zamioculcasz amiifolia growing in 20-cm pots, following treatment with the plant growth regulators PP333 and S3307. The results showed that,(1) PP333 and S3307 could increase width, thickness and weight of pinnae.(2) They also increased soluble sugar content, promoted the activity of antioxidant enzymes and increased cellular reactive oxygen scavenging capacity.(3) After being exposed to low temperature stress of 4 to 5℃for 2 days, differences were found between plants treated with regulators PP333 or S3307 and untreated plants for leaf membrane permeability and FV/FM (fluorescence variable/fluorescence maximum)(4) Treated plants had significantly lower leaf membrane permeability and smaller variation of FV/FM compared to untreated plants. It was concluded that treatment with plant growth regulator PP333 or S3307 can improve the cold tolerance of Zamioculcasz amiifolia.
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