【作者】 马进；

【导师】 汤庚国；

【作者基本信息】 南京林业大学 ， 园林植物与观赏园艺， 2009， 博士

【摘要】 以野生东南景天、凹叶景天和圆叶景天为材料,研究水分、高温、遮荫胁迫下生理响应、有机生态型绿化栽培基质筛选和园林应用。结论如下:⑴随着水分胁迫程度加深,3种景天叶片RWC、SP、PRO、MDA等增加,Fv/F0、Chla+b含量降低(P<0.05),POD和CAT的活性先升后降。轻度水分胁迫下,SOD、POD、SP、Fv/F0、Chla+b、RWC、CAT等指标对景天抗旱性影响较大,中度和重度下,SOD、CAT、REC、Pro、Fv/F0、RWC、MDA和Fv/Fm等指标影响较大。耐旱性:圆叶景天>东南景天>凹叶景天。⑵昼夜45℃/30℃的高温下,3种景天随着高温胁迫天数的增加叶片Chla+b、SOD、POD呈现先上升后降低, RWC逐渐下降,MDA、H202、PRO、SS含量含量增加。Chla+b、MDA、SS、RWC、PRO、H202、SOD 7项指标是鉴定景天耐热性的生理指标。耐热性:东南景天>圆叶景天>凹叶景天。⑶随着遮荫程度加重, 3种景天叶片的RWC显著上升,LA、MDA、SS、SOD、Chla/b降低,Chla+b先增加后降低。轻度遮荫胁迫下LL、RWC、Chla+b、Chla/b、PRO、MDA、SOD等指标对景天的耐荫性影响较大;中度遮荫胁迫下LA、LL、SS、Chla/b、PRO、SOD、Chla+b、RWC等指标影响较大;重度遮荫胁迫下RWC、SS、PRO、SOD、Chla+b和Chla/b等指标影响较大。⑷最佳圆叶景天有机生态型无土基质组合(稻壳:木屑:炉渣)为3:1:2或2:1:2(体积比)。⑸对景天属植物资源及园林应用做系统的评述。更多还原

【Abstract】 In this study,we use wild Sedum alfredii、S. emarginatum and S.makinoi for materials,and do separately research the physiological Stress response of the three kinds of wild Sedum plants which were on water stress,heat stress and shading stress,and do research about green and organic ecotypes cultivation matrix and landscape application .The results are as follows:⑴With the deepening of water stress,three kinds of Sedum plants’leaf RWC、SP、Pro、MDA were gradual increase(P <0.05),Chla+b and Fv/F0 decreased, POD and CAT activity were first increased and then decreased. Under mild water stress, impact of drought on Sedum by SOD,POD,SP,Fv/F0,Chla+b,RWC,CAT and other indicators is large,and under moderate and severe water stress,the impact of drought on Sedum by SOD,POD,SP,Fv/F0, Chla+b,RWC,CAT and other indicators is large.With membership function value of fuzzy math,we do comprehensive identification of drought resistance for the three kinds of Sedum plants,results as follows:comprehensive identification S.makinoi>S. alfredii>S. emarginatum.⑵At the high temperature of 45℃/30℃day and night, the number of days with heat stress the increase in Chla+b、SOD、PODincreased at first, decreased RWC gradually,increased MDA、H202、Pro、SS. Principal component analysis results showed that the 7 targets of Chla+b、MDA、SS、RWC、Pro、H202、SOD are the main heat-resistant physiological target selection of Sedum . Heat stress order of the three kinds of Sedum plants are S. emarginatum>S. alfredii>S. makinoi.⑶With increasing the degree of shade,the leaves RWC of the three kinds of Sedum plants are increased significantly, LA、MDA、SS、SOD、Chla/b decreased continuously,Chla+b first increased and then decreased. Shade gradient has no significance differences in effects of leaf Chla+b content.Under mild shade stress,the impact of shade tolerance Sedum by LL、RWC、Chla+b、Chla/b、PRO、MDA、SOD is large, under moderate shade stress,the impact of shade tolerance Sedum by LA、LL、SS、Chla/b、PRO、SOD、Chla+b、RWC is large, under severe shade stress,the impact of shade tolerance Sedum byRWC、SS、PRO、SOD、Chla+b和Chla/b is large.⑷The best eco-organic type soilless culture substrate combinations of S. makinoi are A3B1C2 or A2B1C2,that is,(rice husk:wood:slag) as 3:1:2or 2:1:2(volume ratio).⑸Sedum plants’wild resources and landscape application were systemticly studied.更多还原