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以6年生“绿宝”苹果为试材,用CI-340光合仪(美国)测定其光合指标,以了解“绿宝”苹果的光合特性。结果表明:净光合速率(Pn)季节变化呈双峰曲线,9月为最高峰,6月为次高峰;Pn日变化呈单峰曲线,10:00—11:00的Pn最高为24μmol·m-2·s-1;光补偿点和饱和点分别为44.363、1 978.074μmol·m-2·s-1,表观量子效率(AQY)为0.038 7;CO2补偿点和饱和点分别为184.58、1 528.58μmol/mol,羧化效率(CE)为0.093 6。影响“绿宝”苹果净光合速率的主成分有3个,分别为气孔导度(C)因子、有效光合辐射(PAR)因子和叶绿素(Chl)含量因子。试验表明,“绿宝”苹果具有较高的光合能力。
The 6-year-old “Lvbao” apple was used as the test material to measure its photosynthetic index with CI-340 photosynthetic apparatus (USA) to understand the photosynthetic characteristics of “Lvbao” apple. The results showed that the seasonal variation of net photosynthetic rate (Pn) showed a bimodal curve, with the highest peak in September and the next highest peak in June. The daily variation of Pn showed a single peak curve, and the highest Pn in 10: 00-11: 00 was 24 μmol · m -2 · s-1; the light compensation point and saturation point were 44.363,1 978.074μmol · m-2 · s-1, the apparent quantum yield (AQY) was 0.0387; CO2 compensation point and saturation point were 184.58, 1 528.58μmol / mol, carboxylation efficiency (CE) of 0.093 6. There were three principal components that affected the net photosynthetic rate of apple, including stomatal conductance (C), photosynthetic radiation (PAR) and chlorophyll (Chl). Experiments show that “Emerald ” apple has a higher photosynthetic capacity.