Abstract: Cucumber of‘Zhongnong 106’in fruiting period was used as material，after 7，14 and 21 days treatment of different temperature and light intensity[the normal temperature and light intensity is 25/15 ℃，（700 ± 30）μmol · m-2 · s-1；the suboptimum temperature and light intensity is 18/12 ℃，（200 ±
20）μmol · m-2 · s-1；the low temperature and weak light is 12/8 ℃；75–100 μmol · m-2 · s-1]，the growth，physiological characteristics and nitrogen absorption of the cucumber were detected. The results showed that，compared with the normal temperature and light intensity，under the suboptimum temperature and light intensity and the low temperature and weak light，the height，leaf area，fruit size and yield of cucumber were significantly decreased. The cucumber root activity，chlorophyll content，fruit quality and glutamine synthetase（GS），glutamate synthase（GOGAT），glutamate dehydrogenase（GDH）activity were decreased with the temperature and light intensity decreasing. Under the suboptimum temperature and light intensity condition，the N content of the cucumber during the fruiting period in the roots，leaves and fruits were declined. The suboptimum temperature and light intensity and the low temperature and weak light treatment reduced the expression of nitrogen transporters protein gene of the cucumber during the fruiting period，and the expression of nitrogen transporters protein gene were suppressed by lower temperature and light intensity. The results indicated that the suboptimum temperature and light intensity may decrease N content by suppressing nitrogen transporters protein gene expression，and then inhibit the growth of cucumber.

Key words: cucumber, suboptimum temperature and suboptimum PFD, the fruiting period, nitrogen, yield