【摘要】 通过对滨梅(Prunus maritima)幼苗进行NaCl胁迫试验,研究滨梅生长及生理状况的变化规律。结果表明:(1)滨梅生物量随NaCl处理浓度升高呈先升后降的趋势,浓度过高则抑制植物生长。(2)随处理浓度的增加,滨梅叶的丙二醛含量和相对电导率均有不同程度的升高;脯氨酸和可溶性蛋白含量也呈上升趋势;而过氧化物酶、超氧化物歧化酶活性和根活力均在浇灌水中NaCl质量浓度为6g/L时达到最大,9g/L时又显著减小。(3)净光合速率、水分利用效率、表观光合电子传递速率和实际光化学效率随浓度递增均呈先升后降的趋势,质量浓度为6g/L时最大,而胞间CO2浓度则与上述光合指标的变化趋势相反。综上所述,滨梅耐盐性较强,在6g/LNaCl处理下长势依然较好。更多还原

【Abstract】 Pot experiments were conducted to research vegetative and physiological changes of Prunus maritima seedlings under NaCl stress. The results showed that its biomass was firstly increased,and then decreased with an increase in NaCl concentration,and its growth was restrained under high level of salinity. Contents of MDA,relative electric conductivity in its leaves were increased to different extents and so were contents of both proline and soluble protein; and the activity of superoxide dismutase,of peroxidase,of root reached a maximum under 6 g/L NaCl in the irrigation water, then reduced significantly at 9 g/L. Changes of net photosynthetic rate,of water use efficiency,of apparent photosynthetic electron transport rate,and of real photochemical efficiency were similar to those of the two enzymes,and also achieved maximun under 6 g/L NaCl,while alterations of intercellular CO2 concentration were contrary to those of the above photosynthetic indexes. In summary,Prunus maritima has high salt resistance,and grows well under condition that NaCl concentration is about 6 g/L.更多还原