【摘要】 为了探明太空诱变油茶M1代的光合生理特性,笔者对油茶苗苗高、地径等生长发育指标及净光合速率、蒸腾速率、气孔导度、胞间CO2浓度、水分利用率等光合日变化参数进行测定和对比分析。结果表明太空诱变油茶M1代的苗高和地径都得到提高,且地径增长达到显著水平;太空诱变油茶M1代的净光合速率日变化为双峰型,在上午11:00时达到首峰,为10.83 mol/m2·s,下午13:00时出现次峰,为6.40 mol/m2·s;胞间CO2浓度变化趋势与净光合速率变化趋势刚好完全相反;蒸腾速率日变化与气孔导度日变化均为单峰型,且趋势完全一致;水分利用率变化趋势与蒸腾速率变化趋势相反。更多还原

【Abstract】 To explore space mutagenesis effect on photosynthetic characteristics of M1 in Camellia oleifera, growth indexes of seedling height and ground diameter, and diurnal change of photosynthetic parameters of net photosynthetic rate, transpiration rate, stomatal conductance, intercellular CO2 concentration and water use efficiency were measured and analyzed. The results showed that the seedling height and ground diameter growth of M1 in C. oleifera after space mutagenesis have been raised,and the ground diameter growth difference has reached the significant level. Space mutation differential daily variation of net photosynthetic rate in M1 generation is bimodal type, and the peak appeared at 11:00 in the morning and at 13:00 in the afternoon, at 10.83 mol/m2·s and 6.40 mol/m2·s. The trend of intercellular CO2 concentration was be just the opposite of net photosynthetic rate. Daily variation of transpiration rate and stomatal conductivity are unimodal type, and the trend was completely consistent, may be because the light cause stomatal opening and reduce the internal resistance, so as to enhance transpiration. Water use efficiency in contrast to the trend of transpiration rate change trend.更多还原