以玉米为材料,用1 000 g 2 h、2 000 g 1 h、4 000 g 40 min、6 000 g 20 min、8 000 g 10 min的超重力对刚萌动的玉米种子进行处理,再用不同浓度的重金属铬溶液对它们进行胁迫处理,测定其丙二醛含量及过氧化氢酶活性的变化。结果表明:一定超重力可以降低某一浓度重金属处理的幼苗丙二醛含量,降低膜脂过氧化水平;在一定重力范围内,Cr2+处理下玉米幼苗的过氧化氢酶活性明显增强。
[ Objective] Study on the photosynthesis and fluorescence characteristics in peony under water stress. [ Method ] The two peony varieties Huhong and Luoyanghong were treated by different water stress for determining the photosynthesis and fluorescence characteristics. [ Result ] With the aggravation of water stress, the net photosynthetic rate （Pn） and stomatal conductance （Gs） decreased, while the intercellular CO2 concentration （Ci） increased. Drought could decrease Pn, constrain gas exchange and change the daily photosynthesis. Fo of peony leaf increased and Fv/Fm decreased under water stress especially water logging, causing the inactivation of the PS II reaction center, and the chlorophyll fluorescence characters gradually recovered until afternoon. [ Conclusion] The 75% soil relative water content （SRWC） is the best condition for growth of peony. Compared with drought, water logging is more unfit for the growth of peony. For the two varieties, Huhong assumed more tolerance to drought, accordingly more adaptability.
