Studies On Rose Standards' Rootstocks

Nowadays, rose standard(Tree rose) becomes a popular garden plant in China, which has an admirable prospect. However, there are lots of undiscovered technical problems to explore in its fostered field.Those tree roses' rootstocks were introduced from America in 2001, and Europe in 2002, respectively. After several years' scientific observations on those rootstocks and further exploration for their cuttings, conclusion can be made that all those rootstocks have the ability to grow well. However, whether the introduced stocks will be widely utilized in Beijing mainly depends on their capacity of resistance to the coldness.Research on rootstocks' cuttings mainly included green branch cuttings of three briers' varieties from America and hard branch dog rose's cuttings from France. Primary discussions were also made about the methods of "stenting" and " one-whip".Main effective elements such as type of media and category or density of hormones had been tested in the experiment of cuttings. Effects about leaves-saved and the different parts of branch from the bottom to the top were also experimented in the green cuttings.In the green cutting of briers, the variety of R. multiflora 'Dr. huey' rooted best treated with 50mg/l ABT2 for 4 hours; R. multiflora 'De La Grefferaie' can easily root after being treated with 200 mg/l NAA + 4% sugar or quickly dipped with 1000 mg/l ABT2 for 2-3 seconds. While R. 'IXL' got a ideal result being treated with 50mg/l ABT2 for 4 hours. Perlite is the most appropriate media for R. 'Dr. huey' and R. 'De La Grifferaie', while vermiculite for R. 'IXL'.Dog rose's cutting test showed that the cool greenhouse or cold frame would be the better place to make the bed, and longer branch will produce more roots. The most proper combination for dog rose cuttings on rooting is 500 mg/1 NAA + 4% sugar for an hour or 1000 mg/1 ABT1 for 10 seconds. The most excellent medium for dog rose's cutting in winter is the mixture of peat +vermiculite + perlite (3:2:1), the rooting percentage cut in this medium is 93%.