本试验对花青素型甘薯烟紫薯2号（Y2）、烟紫薯3号（Y3）和日本紫薯（RZ）不同生长时期的光合光响应变化和光合参数进行研究。结果表明，花青素型甘薯最大净光合速率（ Pnmax ）以块根膨大初期最大，其次是块根盛长期，块根膨大末期小，各时期间差异均显著（P＜0．05）；块根膨大末期的初始量子效率（α）远高于膨大初期值，而光饱和点（Isat）却相反，不同生长时期的光补偿点（Ic）和暗呼吸速率（Rd）无明显差异。对不同品种光合特性比较表明，块根盛长期的α和Rd以RZ为最高，其次是Y2，Y3最低，但Y3的Isat最高；块根膨大末期RZ的Pnmax和Isat均显著高于Y2和Y3，而RZ的Rd则最低。%In this experiment , the photosynthetic light response and photosynthetic parameters of three anthocyanin-type sweet potato varieties , Yanzishu 2 ( Y2) , Yanzishu 3 ( Y3) and Japanese purple sweet po-tato ( RZ) , in different growth periods were studied .The results showed that the maximum net photosynthetic rate (Pnmax) of anthocyanin-type sweet potato as the largest in the initial root -enlargement period, and then rapid root -enlargement period , late root -enlargement period in order .The differences between different growth periods were significant ( P<0 .05 ) .The initial quantum efficiency (α) of latter root-enlargement period was much bigger than the initial value , but the light saturation point ( Isat ) was opposite.The differ-ences in light compensation point (Ic) and dark respiration rate (Rd) between different growth periods were not significant .Compared between different varieties , RZ had the highest αand R d in the rapid enlargement period of root, followed by Y2 and Y3;Y3 had the hightest Isat.In the late growth period, the Pnmax and Isat of RZ were all significantly higher than those of Y2 and Y3, but Rd of RZ was the lowest .
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