Malondialdehyde and proline contents in Quercus aquifolioides at different altitude gradients and their impact factors
Quercus aquifolioides,an evergreen alpine and subalpine species,is endemic to northwestern Yunnan,western Sichuan and eastern Tibet in China.The malondialdehyde (MDA) and proline (Pro) contents in leaves,shoots,bark and fine roots of Q.aquifolioides shrubs were measured along an altitude gradient ranging from 3,000 to 3,950 meters on the eastern slope of Zheduo Mountain in western Sichuan.The results show that the contents of MDA and Pro in leaves were significant higher than those in other organ tissues;The MDA and Pro contents in above-ground tissues increased with increasing altitude,but the contents in fine roots had no significant difference among different elevations;except for MDA contents in fine roots,MDA content in other tissues and Pro contents in all tissues of Q.aquifolioides shrubs had positive correlations with atmospheric temperature and precipitation.The results suggest that in subalpine and alpine environments,Q.aquifolioides' growth was limited by cold and drought stress.The contents of MDA and Pro in Q.aquifolioides were correlated with stress degrees.
NETL
NSTL
万方数据
维普
