外源硅对NaCl处理番茄幼苗r生长和光合特性的影响

摘要

加工番茄品种里格尔87-5为材料,采用水培法,研究了添加Si对不同浓度NaCl条件下的加工番茄幼苗生长量特征参数、膜脂过氧化程度及其保护酶类活性、光合色素含量、光合特性等指标的影响.结果表明,随着NaCl浓度的升高,里格尔87-5总生物量逐渐减少,干物质积累率上升,NaCl浓度为50 mmol/L时,添加Si处理的幼苗干物质积累率极显著高于未添加Si处理(P0.05).在不同浓度NaCl条件下,添加Si处理与不添加Si处理的里格尔87-5叶片叶绿素含量和类胡萝卜素含量间均没有显著差异(P>0.05).NaCl浓度为50 mmol/L时,添加Si处理的净光合速率为10.28μmol/(m2·s),与未添加Si处理相比高出42.08%.50 mmol/LNaCl浓度条件下,添加Si处理能够提高加工番茄里格尔87-5的耐盐能力.%The processing tomato varieties Riegel 87-5 was taken as test material,and the effects of exoge-nous silicon (Si)on the growth parameters,membrane lipid peroxidation and activity of protective en-zymes,photosynthetic pigment content and photosynthetic indexes of processing tomato seedling under salt stress by hydroponic culture were studied.The results showed that with the increase of NaCl concentra-tion,the Riegel 87-5 total biomass decreased and the rate of dry matter accumulation rose instead.When NaCl concentration was at 50 mmol/L condition,dry matter accumulation rate of seedling under Si plus treatment was significantly higher than that in non Si.The leaf relative conductivity and MDA content of Riegel 87-5 seedling increased with increasing of NaCl concentration,and when Si was added,the relative e-lectrical conductivity and MDA content of tomato under NaCl 50 mmol/L treatment were decreased by 72.33%and 19.00%,respectively.Here the SOD activity was significantly enhanced,but Si addition to deal with the effects on the activity of POD and CAT were not significant.Under different NaCl concentration conditions,compared with the no Si treatment,the chlorophyll content and carotenoid content of Riegel 87-5 leaves were affected by the addition of Si treatment,but the difference was not significant between the twos.When the concentra-tion of NaCl was 50 mmol/L,the net photosynthetic rate of tomato treated with Si was 10.257μmol/(m2 ·s),and compared with the no Si treatment it was 42.08% higher.All in all,under the NaCl concentration 50 mmol/L condition,the exogenous Si treatment could increase the salt tolerance abil-ity of the processed tomato Riegel 87-5.