摘要
为了研究Na+和Cl-对番茄产量和品质的影响,以栽培番茄品种辽园多丽为试材,分析了等渗的NaCl(50mmol/L)、Cl-盐和Na+盐胁迫对番茄光合特性及叶片中糖代谢的影响。结果显示,等渗的NaCl、Cl-盐和Na+盐胁迫均导致番茄叶片净光合速率下降,胁迫7d后分别较对照(hoag-land营养液)降低15.18%、6.23%和10.11%;3个胁迫处理均降低了番茄叶片的气孔导度、胞间CO2浓度和蒸腾速率,并降低了番茄叶片中叶绿素a和b的含量,以上光合参数的变化都是Na+盐处理的影响大于Cl-盐处理。在等渗的NaCl、Cl-盐和Na+盐胁迫下,番茄叶片中的果糖和葡萄糖含量较对照显著增加,Na+盐胁迫增加的幅度大于Cl-盐胁迫,而蔗糖和淀粉含量较对照有所降低;等渗的NaCl、Cl-盐和Na+盐胁迫增加了番茄叶片中的蔗糖转化酶活性,其中NaCl处理增加的最多,Na+盐胁迫次之。表明NaCl、Cl-盐和Na+盐胁迫均破坏了番茄叶片的光合机能,降低了光合作用效率,Na+的影响大于Cl-;NaCl、Cl-盐和Na+盐胁迫改变了番茄叶片中的糖代谢方向,显著促进了淀粉和蔗糖的分解,提高了叶片中的果糖和葡萄糖含量,Na+对番茄叶片中糖代谢的影响显著大于Cl-。
Using the cultivated tomato cultivar Liaoyuanduoli as material,the effects of NaCl,Cl——salt and Na＋-salt iso-osmotic stresses on tomato leaf photosynthesis and sugar metabolism were comparatively studied.The results showed that NaCl,Cl——salt and Na＋-salt iso-osmotic stresses reduced tomato leaf net photosynthetic rate and respectively decreased 15.18%,6.23% and 10.11% compared with the control after 7 d of stress;all the three stress treatments reduced tomato leaf stomatal conductance,intercellular CO2 concentration and transpiration rate,and reduced the content of chlorophyll a and b in tomato leaves.In the above changes in photosynthetic parameters,the efficiency of Na＋-salt treatment was greater than that of the Cl——salt treatment.NaCl,Cl——salt and Na＋-salt iso-osmotic stresses significantly increased fructose and glucose le-vels in tomato leaves compared with the control;the increase rate of Na＋-salt stress was greater than that of the Cl——salt stress.Iso-osmotic of the three stress treatments decreased sucrose and starch content in tomato leaves compared with control.NaCl,Cl——salt and Na＋-salt iso-osmotic stresses increased invertase activity in tomato leaves,of which NaCl treatment increased most remarkably,followed by Na＋-salt treatment.Also,the results showed that NaCl,Cl——salt and Na＋-salt iso-osmotic stresses damaged the tomato leaf photosynthetic function,reduced the efficiency of photosynthesis,and the effect of Na＋ was greater than that of Cl-.NaCl,Cl——salt and Na＋-salt iso-osmotic stresses altered the direction of sugar metabolism in tomato leaves,significantly increased the decomposition rate of starch and sucrose,increased fructose and glucose content in tomato leaves,and the effect of Na＋ on sugar metabolism was significantly greater than that of Cl-in tomato leaves.
出处
《河南农业科学》
CSCD
北大核心
2012年第3期107-112,共6页
Journal of Henan Agricultural Sciences
基金
国家“十一五”科技支撑计划项目(2006BAD07B04)
