Abstract: The photosynthetic characteristics，yield and quality in grafted（‘Xinfeng 2’scion grafted
onto‘Weishi’（XF/WS）and‘Buyeding’（XF/BYD）and own-root plants（‘Xinfeng 2’，the control）
of pepper were investigated. The results showed that the pigment content and net photosynthetic rate（Pn）
of grafted and own-root peppers were mostly higher in grafted leaves than in own-root leaves. The light
compensation point of XF/WS and XF/BYD were 38.1 and 50.9 μmo1 · m^-2 · s^-1 respectively，which lower
than that of the control. The light saturation point of XF/WS and XF/BYD were 981.0 and 903.0
μmo1 · m^-2 · s^-1 respectively，both higher than that of control significantly. No differences were found in
apparent quantum yield（AQY），CO2 compensation point and saturation point between grafted and
own-root plants. However XF/WS showed a markedly higher carboxylation efficiency（CE）than that of the control. In comparison with own-root pepper，the yield of XF/WS and XF/BYD increased by 14.9%
and 8.5% respectively，but no changes were observed in the fruit size，shape and color，and the contents of
protein，amino acid，vitamin C and capsaicine in fruits of grafted plants. The contents of dry matter and
soluble sugar in XF/WS fruits increased by 7.1% and 9.7% respectively compared with the control. These
data suggest that‘Weishi’and‘Buyeding’have higher values of application and popularization.

Key words: pepper, grafted, photosynthetic characteristics, yield, quality