Abstract:

To study the effect of rootstocks G5 and B5 on photosynthetic properties of sweet cherry ‘summit’ under salt stress, the photosynthesis and chlorophyll fluorescence parameters of ‘summit’ combined with G5 and B5 were measured under different NaCl treatments. The results showed that, the value of Pn, Gs, Fv/Fo, ΦPSII and ETR declined obviously paralleled with NaCl concentration or treatment time in leaves of ‘summit’ combined with G5 (S-G5) and ‘summit’ combined with B5 (S-B5), photosynthesis of ‘summit’ was inhibited by salinity most cause for stomatal limitation under moderate salinity (3‰ and 6‰ NaCl), while most cause for nonstomatal limitation under high salinity (9‰ NaCl).The discrepancy on photosynthesis between S-G5 and S-B5 depended on the salinity degree, Pn, Gs, Fv/Fo, ΦPSII and ETR in S-G5 declined later and lower than that in S-B5 under moderate salinity, while declined faster and higher under high salinity treatment.