CAJ | 학술논문

为研究盐胁迫对珠美海棠幼苗光合特性的影响，以珠美海棠（Malus zumi）盆栽幼苗为试验材料，测定它们在不同浓度NaCl胁迫下的光合参数和叶绿体色素含量及叶绿素荧光特性的变化。结果表明，盐胁迫下，珠美海棠幼苗的净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、PSⅡ的潜在活性（Fv/F 0）、PSⅡ实际光化学量子产量、叶绿素b都呈先上升后下降的趋势，胞间CO 2浓度（Ci）呈先下降后上升的趋势，叶绿素a和类胡萝卜素均呈下降趋势。低盐浓度（50 mmol·L-1）下，光合相关参数值和叶绿素b含量均有所提高，说明珠美海棠幼苗对盐胁迫有一定适应能力；随着盐浓度升高，珠美海棠幼苗的光合参数、蒸腾速率、叶绿素含量有所降低，表明其光系统受到影响，进而使其光合性能降低。
위연구염협박대주미해당유묘광합특성적영향，이주미해당（Malus zumi）분재유묘위시험재료，측정타문재불동농도NaCl협박하적광합삼수화협록체색소함량급협록소형광특성적변화。결과표명，염협박하，주미해당유묘적정광합속솔（Pn）、기공도도（Gs）、증등속솔（Tr）、PSⅡ적잠재활성（Fv/F 0）、PSⅡ실제광화학양자산량、협록소b도정선상승후하강적추세，포간CO 2농도（Ci）정선하강후상승적추세，협록소a화류호라복소균정하강추세。저염농도（50 mmol·L-1）하，광합상관삼수치화협록소b함량균유소제고，설명주미해당유묘대염협박유일정괄응능력；수착염농도승고，주미해당유묘적광합삼수、증등속솔、협록소함량유소강저，표명기광계통수도영향，진이사기광합성능강저。
In order to explore the effects of salt stress on photosynthesis characteristics ofMalus zumi seedlings, theMalus zumi potted seedlings were used as the experimental materials, and photosynthesis parameters, chlorophyll contents and chlorophyll fluorescence characteristics of the plants were studied under different concentrations of NaCl. The results show that the net photosynthetic rate(Pn), stomatal conductance(Gs), transpiration rate(Tr), potential activity of PSⅡ(Fv/F0), the actual photochemical efficiency of PSⅡand contents of chlorophyll b increased firstly and then declined under salt stress, but intercellular CO2concentration(Ci) decreased firstly and then increased, and the contents of chlorophyll a and carotenoids decreased continuously. Photosynthesis parameters and contents of chlorophyll b increased under lower salinity(50 mmol·L-1 which indicatedMalus zumiseedlings had a certain resistance to salt stress. The photosynthesis parameters, transpiration rate (Tr), chlorophyll contents of the plants declined with the salt contents increase, and it indicated that the photosystem of the plant was interfered and its photosynthesis performance reduced.