论文部分内容阅读
采用营养液栽培,研究Ca(NO3)2和NaCl胁迫对黄瓜嫁接用砧木南瓜幼苗生长和抗氧化酶活性的影响,并用隶属函数法综合评价其耐盐性.结果表明:低浓度盐30mmol.L-1Ca(NO3)2和等渗的45mmol.L-1NaCl处理促进砧木幼苗生长;高浓度盐60、120mmol.L-1Ca(NO3)2和等渗的90、180mmol.L-1NaCl胁迫下,各砧木幼苗的生长和抗氧化酶系统均受到不同程度的抑制,其中,‘青砧1号’的盐害指数最小,生物量及超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性的下降幅度以及相对电导率的上升幅度均小于其他砧木.高盐Ca(NO3)2胁迫下,各砧木SOD、POD和CAT酶活性均高于等渗的NaCl,而盐害指数和相对电导率低于NaCl,表明Ca(NO3)2对砧木南瓜幼苗生长的危害小于NaCl.4个砧木品种的耐盐性顺序为‘青砧1号’>‘佐木南瓜’>‘丰源铁甲’>‘超霸南瓜’.
The effects of Ca (NO3) 2 and NaCl stress on the growth and antioxidant enzyme activity of cucumber seedling with grafting rootstocks were studied by nutrient solution cultivation, and the salt tolerance was evaluated synthetically by the membership function method.The results showed that low salt 30mmol.L -1Ca (NO3) 2 and isotonic 45mmol.L-1NaCl promoted the growth of rootstock seedlings. Under the stress of 60,120mmol.L-1Ca (NO3) 2 and isotonic 90,180mmol.L-1NaCl Rootstock seedling growth and antioxidant enzyme system were inhibited to varying degrees, of which, ’Qingyuan 1’ had the lowest salt damage index, biomass and superoxide dismutase (SOD), peroxidase (POD) and CAT activity decreased and relative conductivity increased less than other rootstocks.The activities of SOD, POD and CAT of all rootstocks were higher than that of NaCl at high salt Ca (NO3) 2 stress, While the salt damage index and relative electric conductivity were lower than that of NaCl, indicating that the harm of Ca (NO3) 2 to the growth of pumpkin seedlings of rootstocks was less than that of NaCl. The order of salt tolerance of the four rootstocks was ’Qingqin 1’> ’Zuoqi pumpkin’ > ’Fengyuan armor’> ’super pumpkin’.