The Effects of Drought Stress On Endogenous Hormone in Prunus campanulata Maxim. and Prunus yedoensis Matsum. Seedlings
The effects of drought stress on the endogenous hormone of 1-year-old pot-cultured Prunus campanulata Maxim and Prunus yedoensis Matsum seedings were studied under water treatment gradient(CK, LS, MS andHS).The results showed that under LS, the content of IAA and GA3were higher than that of the CK, while the content of ABA had no significance with CK; Under MS and HS, the content of GA3and IAA decreased significantly, and the content of ABA, ABA/GA3and ABA/IAA increased obviously. Wiht the time of drought stress prolonged, the content of GA3, IAA and ABA had no significant changes under LS, compared wiht LS, the content of GA3and IAA showed a downward trend and the content of ABA, ABA/GA3and ABA/IAA showed a trendency of increase under MS and HS. With the drought stress strengthening, the content of ABA, GA3, IAA and ABA/GA3and ABA/IAA of P. campanulata Maxim was higher than that of P. yedoensis Matsum, which showed that P. yedoensis Matsum had higher ability of adjusting the hormone level to deal with the drought stress outside than P. campanulata Maxim which may be one of the physiological mechanism that P. yedoensis Matsum had a higher drought resistance ability than P. campanulata Maxim.