We have reported that the roots of figleaf gourd(Cucurbita ficifolia,as rootstock) could improve the resistance of cucum-ber seedlings(Cucumis sativus L.cv.Jinyan 4,as scion) to 6 h stress at low temperature and low irradiance [1].In this experiment,the relationship between the mineral elements uptake and photosynthetic activity of photosystems in figleaf gourd and cucumber seedlings were to be studied during lowtemperature(8 C) stress under lowirradiance(100 μmol m-2 s-1 PFD) for 5 days.Compared with control seedlings,the maximal photochemical efficiency of PS2(Fv/Fm) and the oxidizable P700(P700+) of both figleaf gourd and cucumber seedlings decreased,and both Fv/Fm and P700+ were lower in cucumber leaves than in figleaf gourd seedlings at the end of the stress.Superoxide dismutase(SOD) activity was higher in both leaves and roots of figleaf gourd than in leaves and roots of cucumber at both room temperature and low temperature.However,the product rate of O 2 was lower in figleaf gourd leaves than in cucumber leaves.Upon ex-posure to the stress,the malondialdehyde(MDA) content increased markedly in leaves and roots of figleaf gourd and cucumber seedlings,and it grewfaster in cucumber seedlings than that in figleaf gourd seedlings.Under adaptive conditions,some mineral elements(Such as Cu,Zn,Mn and Mg) have different contents in leaves and roots between figleaf gourd seedlings and cucumber seedlings.However,at the end of the stress these elements were accumulated apparently in both leaves and roots of figleaf gourd accompanied by no obvious change in cucumber seedlings. We have reported that the roots of figleaf gourd (Cucurbita ficifolia, as rootstock) could improve the resistance of cucum-ber seedlings (Cucumis sativus L.cv.Jinyan 4, as scion) to 6 h stress at low temperature and low irradiance [1 ]. This experiment, the relationship between the mineral elements uptake and photosynthetic activity of photosystems in figleaf gourd and cucumber seedlings were to be studied during low temperature (8 C) stress under lowirradiance (100 μmol m-2 s-1 PFD) for 5 The maximal photochemical efficiency of PS2 (Fv / Fm) and the oxidizable P700 (P700 +) of both figleaf gourd and cucumber seedlings decreased, and both Fv / Fm and P700 + were lower in cucumber leaves than in figleaf gourd seedlings at the end of the stress. Superoxide dismutase (SOD) activity was higher in both leaves and roots of figleaf gourd than in leaves and roots of cucumber at both room temperature and low temperature. Home, the product rate of O 2 was lower in figleaf go urd leaves than in cucumber leaves. After ex-posure to the stress, the malondialdehyde (MDA) content increased markedly in leaves and roots of figleaf gourd and cucumber seedlings, and it grewfaster in cucumber seedlings than that in figleaf gourd seedlings.Under adaptive conditions , some mineral elements (Such as Cu, Zn, Mn and Mg) have different contents in leaves and roots between figleaf gourd seedlings and cucumber seedlings.However, at the end of the stress were these elements were accumulated apparently in both leaves and roots of figleaf gourd accompanied by no obvious change in cucumber seedlings.