茶多酚对盐胁迫下小麦幼苗根渗透调节作用的影响
杨颖丽,马海荣,李 晶,李 琼,吕丽荣
【摘 要】摘要:以春小麦新品种“陇春30号”为材料,研究了不同浓度(25和100 mg·L-1)的茶多酚(Tea polyphenols,TP)对NaCl(150 mmol·L-1)胁迫下小麦幼苗渗透调节物及脯氨酸代谢相关酶活性的影响.结果表明,150 mmol·L-1 NaCl处理诱导小麦根中可溶性糖、可溶性蛋白和脯氨酸含量较对照显著升高,而25和100 mg·L-1 TP单独处理对这些指标无显著影响;与单独150 mmol·L-1 NaCl处理相比,添加100 mg·L-1 TP诱导盐处理的根可溶性糖、可溶性蛋白和脯氨酸含量显著降低.盐胁迫、单独TP处理和盐+TP处理都导致小麦根脯氨酸脱氢酶(PDH)活性明显下降;鸟氨酸转氨酶(OAT)活性在盐处理下较对照无明显变化,其他各个处理下活性减弱.谷氨酸激酶(GK)活性在各个处理中无明显变化.盐胁迫和单独TP处理均诱导小麦根Na,K元素含量显著增加,不同浓度TP 的加入不显著影响盐诱导的Na,K含量的变化,小麦根在150 mmol·L-1 NaCl处理后K/Na显著减小,TP的添加不显著影响这种变化.盐胁迫下小麦根Ca元素减少,然而盐胁迫下加入不同浓度(25和100 mg·L-1)TP后,根中Ca含量显著增加.总之,盐胁迫诱导的小麦根可溶性蛋白、可溶性糖和脯氨酸含量的增加,提高了渗透性调节能力,以缓解盐对植物的伤害;TP的加入逆转了盐诱导的小麦根可溶性糖、可溶性蛋白和脯氨酸等渗透性调节物的积累及Ca元素含量的减少.
【期刊名称】西北师范大学学报(自然科学版) 【年(卷),期】2017(053)005 【总页数】7
【关键词】茶多酚;盐胁迫;渗透调节物;小麦幼苗根
Abstract:Spring wheat cv longchun 30 seedlings are used to investigate effect of tea polyphenols(TP) on osmotic regulators and proline metabolic enzyme activities in salinity-treated roots.The results show that proline,soluble sugar and soluble protein contents significantly elevate in wheat roots exposed to 150 mmol·L-1 NaCl,but 25 and 100 mg·L-1 TP alone treatments have no significant effect on these indexes as compared with control.Compared with 150 mmol·L-1 NaCl alone treatment,soluble sugar,soluble protein and proline contents decrease significantly by adding 100 mg·L-1 TP in salt treatment.Proline dehydrogenase(PDH) activity decrease in response to salt stress,TP treatments
and
salt+TP
treatments
in
wheat
roots,ornithine
aminotransferase activity(OAT) don’t change significantly in salt treatment,but OAT activity in other treatments is weakened comparision with control.Glutamate kinase(GK) activity has no obvious change in each treatment.Na and K contents reduce significantly in wheat roots stressed by salt and TP treatment alone,the addition of different TP concentrations do not significantly affect on salinity-induced changes in Na and K contents.After treatment with 150 mmol·L-1 NaCl,K/Na value decrease significantly in wheat roots,and there has no significant influence on this value by adding TP.Ca content decline in wheat roots treated with salt,however the addition of different TP concentrations
lead to the decrease of Ca contents.In summary,salt stress results in significant increases of soluble protein,soluble sugar and proline contents in wheat roots,which is conducive to the improvement of permeability regulation and the relief of salt damage to plants;And also,TP application blocks the accumulation of permeability regulators and the reduction of Ca level in salinity-stressed wheat roots.
Key words:tea polyphenols;NaCl stress;osmotic adjustment;wheat root 陇南属我国江北茶区的北缘产地,是甘肃唯一的茶叶产区,早在两宋及明清时期就是茶马交易的重要地区,文县碧口镇李子坝村至今还保留着20多株清道光年间种植的茶树.陇南茶园以小叶群体种为主,由于产茶区纬度高、海拔高、环境清洁度高,决定了陇南茶园休养时间长、采摘轮次少,所产绿茶芽头重实、茶多酚含量高、香高耐泡[1].茶多酚(Tea polyphenols, TP)又名茶单宁、儿茶素,属多酚类物质,是从茶叶中提取的包括黄烷醇类、花色苷类、黄酮类、黄酮醇类和酚酸类等多羟基酚类衍生物的混合物,其中黄烷醇类物质(儿茶素)的作用最为重要[2].这些多酚类物质化学结构中有多个活性羟基在氧化过程中可以生成邻醌类及联苯酚醌从而可以消除活性氧自由基,因此具有较强的抗氧化能力[3].如给小鼠灌胃茶多酚,能够清除自由基,对受辐射的小鼠具有保护作用[4].在高糖条件培养下的大鼠晶状体上皮细胞线粒体活性氧产生增多,添加茶多酚后细胞线粒体活性氧产生减少,细胞死亡率降低[5].近年来,茶多酚由于其较强的抗氧化性,被广泛应用于食品、医疗、日用化学品以及畜牧业等领域,特别是在食品保鲜领域[2].当把茶多酚从中低档茶提取出后添加到香烟中,能降低香烟燃烧时产生的自由基对人体的伤害[6].尽管茶多酚的抗氧化作用一直是近年
茶多酚对盐胁迫下小麦幼苗根渗透调节作用的影响



