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使用LI-6400便携式光合测定系统对三种水培甘薯食用型‘南薯88’、兼用型‘徐薯18’和特用型‘南紫薯008’的光合进行了测定,利用非直角双曲线模型对三种甘薯品种的光合作用生理参数进行拟合。结果表明,不同类型甘薯品种的光响应曲线的特征参数存在着差异,食用品种‘南薯88’的光和潜力最强,可在高密度栽培下发挥群体优势达到高产;兼用型品种‘徐薯18’对光的适应性次之,在较高密度栽培下能发挥群体优势;特用型品种‘南紫薯008’的光合潜力和对光的适应性均最弱,但对弱光的利用率最高,最适合于间套作。不同类型甘薯品种间的生理指标存在相似的变化,气孔导度和蒸腾速率对净光合速率的影响达极显著正相关,胞间CO2浓度对甘薯净光合速率的影响呈极显著负相关,揭示了不同类型甘薯品种在光能利用上的差异。‘南紫薯008’在较低光强下能很快使气孔打开,蒸腾速率也快速增加,从而使光合速率也加强。在高光强下,‘南薯88’的气孔导度、胞间CO2浓度值最大,这可能是‘南薯88’光合速率高的原因。为田间甘薯的共性和特异性研究提供了一定的理论基础。
LI-6400 portable photosynthesis system was used to measure the photosynthesis of three hydroponic sweet potato varieties ’South potato 88’, dual-use ’Xushu 18’ and special-type ’South purple potato 008’. By using non-rectangular hyperbola The model was fitted to photosynthesis physiological parameters of three kinds of sweet potato varieties. The results showed that the characteristic parameters of light response curve of different types of sweetpotato varieties differed. The light and potential of the edible variety’Hanzuo88’was the strongest and could exert the advantages of population to achieve high yield under high density cultivation. The adaptability of 18 ’to light was second, and it could exert population advantage under higher density cultivation. The photosynthetic potential and adaptability to light of’ South Purple Potato ’008’ was the weakest, but the utilization of low light The highest rate, the most suitable for intercropping. Physiological indexes of different types of sweetpotato varieties had similar changes, the stomatal conductance and transpiration rate had a significant positive correlation with the net photosynthetic rate, and the intercellular CO2 concentration had a significantly negative correlation with the net photosynthetic rate of sweet potato, revealing Differences in Light Energy Utilization of Different Types of Sweet Potato Varieties. ’South Purple Potato 008’ can quickly open the stomata at lower light intensity, and the transpiration rate also increases rapidly, so that the photosynthetic rate is also strengthened. Under high light intensity, the stomatal conductance and intercellular CO2 concentration of ’South Potato 88’ were the highest, which may be the reason for the high photosynthetic rate of ’South Potato 88’. It provided a theoretical basis for the study of commonality and specificity of sweet potato in the field.