盐胁迫对红叶石楠红罗宾生理特征影响的实验研究

Experimental study on effect of salt stress to the physiological characteristics of Photinia Red Robin

在NaCl盐胁迫环境下,以50 mmol·L^(–1)为浓度梯度,NaCl浓度分别为0、50、100、150、200 mmol·L^(–1),研究红叶石楠‘红罗宾’叶片含水量、叶绿素含量、质膜相对透性、丙二醛(MDA)含量、可溶性蛋白含量、可溶性糖含量、过氧化物酶(POD)活性变化以及抗坏血酸过氧化物酶(APX)活性变化等生理特征。结果表明:叶片含水量、丙二醛含量、可溶性糖含量、抗坏血酸过氧化物酶活性均随NaCl浓度的升高先增大,后降低;叶绿素含量、可溶性蛋白含量随NaCl浓度的升高先降低后升高又降低;膜相对透性随NaCl浓度的升高持续增大,而过氧化物酶(POD)活性随NaCl浓度的升高则先升高后降低,超过一定浓度后又升高。根据结果显示,红叶石楠‘红罗宾’具有一定耐盐性,可在适当盐碱地地区的环境绿化建设中推广应用。

The effect of salt stress to the physiological characteristics of Photinia Red Robin was investigated when exposed to0,50,100,150and200mmol·L-1of NaCl by determining leaf water content,chlorophyll content,membrane permeability,malondialdehyde(MDA)content,soluble protein content,soluble sugar content,and the changes of peroxidase(POD)activity and ascorbate peroxidase(APX)activity.It was found that with the increase of NaCl concentration,leaf water content,MDA content,soluble sugar content,and APX activity increased first and then decreased.Chlorophyll content and soluble protein content both had a variation tendency from decrease to increase and then increase to decrease,while the change of POD activity had a reverse variation.Membrane permeability continued increasing,which illustrated that Photinia Red Robin had a certain tolerance for salt and could be applied in the garden construction in saline area.