Abstract:

As most plants in Primula favorating in cold enviroment, high-temperature became a key factor in introducting as a cultivated plant.To study the response mechanism of Primula to high temperature, and select some Physiological indexes wnich would be considered as the system of heat-resistance for the primula and higher heat-resistance germplasm, the heat injury index, chlorophyll content, conductivity and MDA content, free proline and soluble protein content were measured of six primula who were Primula forrestii,P.denticulatessp.sinodenticulata,P. obconica,P. veris,P. malacoides franch and P. saxatilis under the different time in 42℃ high temperature stress. The result showed that: the heat injury index, conductivity and MDA content, free proline and soluble protein content were all would be considered as the system of heat-resistance for the primula, through the differences in heat resistance of the different kinds of Primula under the comprehensive analysis of the indexes, Primula forrestii and P. malacoides franch had higher heat-resistance, P. obconica, P. veris, P. saxatilis had ordinary heat-resistance, P.denticulatessp.sinodenticulata had lower heat-resistance.