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《Journal of Northeast Forestry University》 2001-04
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Endogenous Hormones and Nutritive Material in Softwood Cuttings of Betula platyphylla during Rooting

Zhan Yaguang, Yang Chuanping, Jin Zhenfu, Wang Yucheng(Northeast Forestry University, Harbin 150040, P. R. China)  
Endogenous plant hormones and nutritive material content in softwood cuttings of Betula platyphylla were analyzed during rooting, and the influence of external hormones on endogenous plant hormones was also studied. The results show that the contents of IAA, ABA and soluble sugar change remarkably in cuttings during rootage period. It suggusted that the rate of IAA/ABA can be used to estimate and foretell the rooting capacity of birch. C/N of cuttings were decided by carbohydrate content just like soluble sugar. Plant growth regulator treat can increase the contents of IAA and ZR, but decrease the levels of ABA and GA 4 during primordium formation. IAA/ABA and soluble sugar reduce as tree age increasing. There is obvious difference in IAA/ABA ratio among tree clones. The cuttings with one leaf have higher level of IAA/ABA, soluble sugar and C/N, as the result they have higher rooting rate.
【Fund】: 国家“九五”攻关课题
【CateGory Index】: S792.153
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