4种野生早熟禾对土壤酸碱性的生理响应

摘要

To investigate the mechanism by which soil pH affects physiological characteristics of wild bluegrass and to determine the optimum growth pH for wild bluegrass,the physiological indicators of four wild blue-grasses collected in Gansu Province were determined under 8 pH treatments.The results showed that in the range of 3 to 10,with an increase in pH,relative membrane permeability,free proline(Pro),soluble sugar (SS),and MDA and POD activity of the four wild bluegrasses showed first a decrease and then an increase, whereas the soluble protein content (SP)and activity of superoxide dismutase (SOD)and catalase (CAT) showed an opposite trend.The optimal pH values,in which damage to the bluegrass was minimal,was 7 for Kentucky bluegrass,small medicine bluegrass,and annual bluegrass,and 6 for hard bluegrass.These results provide information for the maintenance and management of Kentucky bluegrass lawns,as well as the introduc-tion and domestication of wild Kentucky bluegrass.%以甘肃省境内采集的4种野生早熟禾为材料,设8个pH处理(3、4、5、6、7、8、9、10),探讨土壤pH对其生理特性的影响机制以及适宜生长的土壤pH,以期为早熟禾属草坪的养护管理和野生早熟禾的引种驯化提供依据.结果表明,随pH增大,4种野生早熟禾相对膜透性,游离脯氨酸(F-Pro)、可溶性糖(SS)和丙二醛(MDA)含量及过氧化物酶(POD)活性均呈先减小后增大的趋势,可溶性蛋白(SP)含量和超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性均呈先增大后减小的趋势;草地早熟禾(Poa pratensis)、一年生早熟禾(P.annua)和小药早熟禾(P.micrandra)在pH为7时,硬质早熟禾(P.sphondylodes)在pH为6时受到的伤害最小,是其最适宜生长的pH.