Abstract: Growth and development of cucumber in spring greenhouse were affected obviously by low light,such as thinness of stem, decreasing dry weight of plants and yield,and increasing abnormal fruit ratio, etc. In low light,the content of Chlorophyll and net photosynthetic rate (Pn) decreased. For the cucumber seedlings that were treated by low light,whether in normal light or low light,its Pn decreased obviously, and the experiment on stomata conductance and intercellular CO₂ concentration showed that in the low light the stomata factors resulted in decreasing the Pn of cucumber seedling,while in the normal light the non-stomata factors probably cause the decreasing of Pn. Fv/Fm of cucumber seedlings and plants didn't change obviously after low light treatment. The slight differences in different treatment indicated that Fv/Fm did not cause the qualitative change by low light stress. And low light resulted in decreasing the content of carotenoid and would lead to photoinhibition. The reaction of cucumber lines to low light stress was different,and effect of different low light treatment to cucumber growth and development were also not same. Several tests data showed that inbred line Q21 has better resistance than T94 to low light,which accord with the observation in past years. The Chlorophyll and carotenoid that play an important role to the absorption and converting of energy in photosynthetic activity was destroyed slightly and was the foundation of resistance to low light.

Key words: Cucumber, Low Iight, Growth, Development

CLC Number: 

• S642.225.5+2