盐处理下2种砧木对甜樱桃‘萨米脱’光合影响的比较

Comparison on the Effects of Rootstocks on Photosynthesis and Chlorophyll Fluorescence Parameters of Sweet Cherry‘Summit’under Salt Stress

在不同浓度NaCl处理下,测定了以‘吉塞拉5号’(G5)、B5为砧木的甜樱桃‘萨米脱’光合和叶绿素荧光参数。结果表明:盐胁迫下,2种砧木嫁接的‘萨米脱’叶片的Pn、Gs、Fv/Fo、ΦPSII和ETR值随着处理浓度的增加或处理时间的延长显著下降,适度盐胁迫对‘萨米脱’叶片的光合抑制主要是气孔限制(0.3%和0.6%NaCl),高盐胁迫主要为非气孔限制(0.9%NaCl)。2种砧木对所嫁接的‘萨米脱’光合影响效应因盐胁迫程度而异,适度盐胁迫下,以G5为砧木的Pn、Gs、Fv/Fo、ΦPSII和ETR值较以B5为砧木的下降时间晚且降幅小,但在高盐胁迫下则反之。

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 NaC1 treatments. The results showed that, the value of Pn, Gs, Fv/Fo, PSII and ETR declined obviously paralleled with NaC1 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 （0.3% and 0.6% NaC1）, while most cause for nonstomatal limitation under high salinity （0.9% NaC1）.The discrepancy on photosynthesis between S-G5 and S-B5 depended on the salinity degree, Pn, Gs, Fv/Fo, PSII 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.