CAJ | 학술논문

　　为了解四倍体紫薇和二倍体紫薇光合生理特性的差异，培育优质林木，采用英国PP-Systems公司产CIRAS-1型便携式光合系统测定人工诱变培育的四倍体紫薇品种和二倍体紫薇品种的各项光合生理参数及其变化规律。结果表明：四倍体和二倍体紫薇的叶片净光合速率(Pn)日变化都呈单峰型曲线，但峰值出现的时间不同。2个紫薇品种的Pn、气孔导度(Gs)和水分利用率(WUE)差异显著，蒸腾速率(Tr)、表观量子效率(AQY)和羧化效率(CE)差异不显著。光饱和点(LSP)为二倍体紫薇[1445μmol/(m2·s)]<四倍体紫薇[1670μmol/(m2·s)]，光补偿点(LCP)为二倍体紫薇[12.23μmol/(m2·s)]<四倍体紫薇[42.2μmol/(m2·s)]；CO2饱和点(CSP)为二倍体紫薇(1200μmol/mol)<四倍体紫薇(1427.5μmol/mol)，CO2补偿点(CCP)为二倍体紫薇(32.24μmol/mol)<四倍体紫薇(35.71μmol/mol)。四倍体紫薇单位叶面积叶绿素含量显著高于二倍体紫薇(P<0.05)。
　　위료해사배체자미화이배체자미광합생리특성적차이，배육우질림목，채용영국PP-Systems공사산CIRAS-1형편휴식광합계통측정인공유변배육적사배체자미품충화이배체자미품충적각항광합생리삼수급기변화규률。결과표명：사배체화이배체자미적협편정광합속솔(Pn)일변화도정단봉형곡선，단봉치출현적시간불동。2개자미품충적Pn、기공도도(Gs)화수분이용솔(WUE)차이현저，증등속솔(Tr)、표관양자효솔(AQY)화최화효솔(CE)차이불현저。광포화점(LSP)위이배체자미[1445μmol/(m2·s)]<사배체자미[1670μmol/(m2·s)]，광보상점(LCP)위이배체자미[12.23μmol/(m2·s)]<사배체자미[42.2μmol/(m2·s)]；CO2포화점(CSP)위이배체자미(1200μmol/mol)<사배체자미(1427.5μmol/mol)，CO2보상점(CCP)위이배체자미(32.24μmol/mol)<사배체자미(35.71μmol/mol)。사배체자미단위협면적협록소함량현저고우이배체자미(P<0.05)。
In order to analyze the differences on photosynthetic characteristics of tetraploid and diploid Lagerstroemia indica L. and develop high- quality forest, CIRAS-1 portable photosynthesis system was employed to measure various photosynthetic physiological parameters and their variation regularities in tetraploid and diploid Lagerstroemia indica L.. The results showed that both the diurnal change of net photosynthetic rate (Pn) of etraploid and diploid Lagerstroemia indica L. showed a single-peak curve, but the peak value appeared at different hours. The net photosynthetic rate, stomatal conductance and water use efficiency had significant difference between the tetraploid and diploid Lagerstroemia indica L. and the transpiration rate, apparent quantum yield and carboxylation efficiency had no significant difference. Light saturation point (LSP) of diploid Lagerstroemia indica L. [1445 μmol/(m2·s)] was lower than that of tetraploid Lagerstroemia indica L. [1670 μmol/(m2·s)] and light compensation point (LCP) of diploid Lagerstroemia indica L.[12.23 μmol/(m2·s)] was lower than that of tetraploid Lagerstroemia indica L.[42.2 μmol/(m2·s)]. CO2 saturation point (CSP) of diploid Lagerstroemia indica L. (1200 μmol/mol) was lower than that of tetraploid Lagerstroemia indica L. (1427.5 μmol/mol) and CO2 saturation point (CCP) of diploid Lagerstroemia indica L. (32.24 μmol/mol) was lower than that of tetraploid Lagerstroemia indica L. (35.71 μmol/mol). The chlorophyll content of unit leaf area of tetraploid Lagerstroemia indica L. were significantly higher than that of the diploid Lagerstroemia indica L. (P<0.05).