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Trees (2014) 28:359–372 DOI 10.1007/s00468-013-0954-1 ORIGINAL PAPER Elevational patterns of endogenous hormones and their relation to resprouting ability of Quercus aquifolioides plants on the eastern edge of the Tibetan Plateau Wan-Ze Zhu • San-Gen Wang • De-Zhen Yu • Yong Jiang • Mai-He Li Received: 23 June 2013 / Revised: 4 September 2013 / Accepted: 29 October 2013 / Published online: 15 November 2013 Springer-Verlag Berlin Heidelberg 2013 Abstract cytokinins (CTK) and CTK/IAA ratios decreased in Key message Above- and belowground tissues showed aboveground tissues of intact plants with increasing ele- different trends in IAA, CTK and CTK/IAA ratios with vations. The altitude had reverse effects on these parame- elevations, and coppicing changed the levels of endog- ters in belowground tissue. Coppicing changed the levels of enous hormones that are related to resprouting ability. IAA, CTK, and nitrate concentrations, as well as the CTK/ Abstract Little is known about how plant hormones and IAA ratios, but not their elevational patterns in either nitrate concentrations change in plants with increasing stumps or roots. These results imply that the elevational elevations, and whether the alpine treeline formation and patterns of plant hormones reflect mainly the effects of the decreased resprouting ability of plants at high eleva- altitude associated with gradual changes in temperature and tions are correlated with such changes. We studied tissue radiation condition on hormones along an elevational gra- hormones and nitrate concentrations in Quercus aquifo- dient. Both CTK concentrations and CTK/IAA ratios in lioides plants befor