Physiological and Biochemical Response and Drought Resistance Evaluation of Four Wild Bryophytes
In order to provide the theoretical and practical references for selecting and applying drought tolerance plantscape resources,four common bryophytes (Haplocladium angustifolium,Eurhynchium eustegium,Brachythecium moriense,Taxiphyllum taxirameum) were treated by 15％ PEG for droughtstress test.Physiological and biochemical indexes(contents of chlorophyll,free proline,MDA,soluble proteins,cell membrane permeability,SOD,POD,and CAT)were measured and compared,combined with morphological observations,the drought resistances of 4 species were evaluated.The results showed the contents of chlorophyll and MDA,cell membrane permeability and the activities of three kinds of enzymes presented downward trends with time.The content of free proline showed a slow process of rising,and that of soluble protein increased first and then decreased.After 24 h rehydration,the contents of MDA and cell membrane permeability of 4 species still decreased.The contents of chlorophyll of H.angustifolium and T.taxirameum significantly increased,while that of the other species appeared slightly downward trends.According to the comprehensive analysis of all indicators,it was suggested that H.angustifolium exhibited the strongest tolerance to drought,while B.moriense was the weakest.The difference of drought tolerance between E.eustegium and T.taxirameum was not obvious.
bryophytedrought stressdrought tolerancephysiological index
国家科技期刊平台
NSTL
万方数据
维普
