The Photosynthesis Characteristics Analysis on a Yellow Green Maize
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摘要: 通过对玉米（Zea mays L.）黄化材料和2份正常自交系的光合特性、光响应曲线及荧光动力学参数进行分析，结果表明，黄化材料yglm1的净光合速率（Pn）、气孔导度（Gs）和胞间CO2浓度（Ci）均显著低于正常自交系Mo17和RP128，而蒸腾速率（Tr）却显著高于正常自交系；黄化材料的光补偿点、光饱和点、暗呼吸速率及表观量子效率均高于正常自交系Mo17和RP128，但其净光合速率却低于正常自交系；黄化材料的荧光动力学参数初始荧光（Fo）、最大荧光（Fm）、PSⅡ原初光能转换效率（Fv/Fm）、PSⅡ原初光能捕获效率（Fv’/Fm’）、PSⅡ光下实际光化学效率（ΦPSⅡ）、光化学猝灭系数（qP）均显著低于正常自交系Mo17和RP128，非光化学猝灭系数（qN）显著高于正常自交系。相对于正常自交系，黄化材料具有较低的电子传递潜力、原初光能捕获效率和转换效率、光能分配及利用率，这可能是导致其净光合能力降低的根本原因。Abstract: Photosynthetic characteristics,light-response curve and fluorescence kinetic parameters were measured for the yellow green maize of Zea mays L.and two normal inbred maize lines Mo17 and RP128 by a portable photosynthetic analyzer LI-6400 and Pulse-Amplitude-Modulation Chlorophyll Fluorometer.Results showed that the net photosynthetic rate(Pn),stomatal conductance(Gs)and intercellular CO2 concentration(Ci)for yellow green maize yglm1 were significantly lower than the normal inbred lines Mo17 and RP128,but the transpiration rate(Tr)was significantly higher.The photosynthesis-light response curve indicated that light compensation point,light saturation point,dark respiration rate and apparent quantum efficiency for yellow green maize were higher than normal inbred lines Mo17 and RP128.Measurement of fluorescence kinetics parameters showed that initial fluorescence(Fo),maximal fluorescence(Fm),primary light energy conversion of PSⅡ(Fv/Fm),efficiency of light energy capture by PSⅡ(Fv'/Fm'),actually photochemical efficiency of PSⅡ with light(ΦPSⅡ),and photochemical quenching coefficient(qP)for yellow green maize were significantly lower than normal inbred lines Mo17 and RP128,but non-photochemical quenching coefficient(qN)was significantly higher.Yellow green maize had lower photosynthetic rate than Mo17 and RP128,which may be related to their lower electron transfer potential,lower light capture efficiency and transformation efficiency,and lower energy allocation and utilization.
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