Abstract: By CO₂ enrichment, high temperature, greenhouse cucumber seedlings grafted membrane permeability, a nd protective enzyme activities were measured indicators such as internal physiological analysis to the theoretical yield of cucumber heat and provide a theoretical basis. This study suggested that the permeability of membrane, proline content, malondladehyde content of grafting cucumber seedlings in the greenhouse increased obviously with high temperature, and were higher than the contrast with statistical differences; SOD activity, POD activity, CAT activity increased at first but decreased later with significant modification; It showed a tendency with increase at first and decrease later of the permeability of membrane, proline content, malondladehyde content of grafting cucumber seedlings in the greenhouse within high temperature and elevated CO₂, a nd was lower than the contrast at the sixth day of conduct; SOD activity, POD activity, CAT activity showed a tendency with increase and was greater compared with the zones of high temperature; the permeability of membrane, proline content 、malondladehyde content of grafting cucumber seedlings were lower than the contrast with elevated CO₂, SOD activity, POD activity, CAT activity were higher than the contrast but were lower than the zones of high temperature. From the data it is concluded that CO₂ enrichment not only receded the injury caused by the high temperature, but also could enhance the ability of the plants to resist high temperature, heat resistance of cucumber in greenhouse grafted have a catalytic effect.

Key words: CO₂, High-temperature, Grafting cucumber, Permeability of membrane, Protective enzymes

CLC Number: 

• S642.2