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采用盆栽实验法,分别用盐度为2,4,6,8的NaCl溶液对蛋黄果(Lucuma nervosa A.DC)进行了NaCl胁迫处理,测定其叶绿素、超氧化物酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)、游离脯氨酸、可溶性蛋白、可溶性糖、丙二醛等生理生态指标以及盆土的实际盐度,研究蛋黄果的耐盐性并为果树的耐盐机理提供理论依据.结果表明:在NaCl胁迫下,蛋黄果的生长及叶绿素合成受到明显抑制,在土壤盐度小于0.19时无盐害现象;SOD、POD的活性均随NaCl浓度增加而显著升高,CAT活性在盐度为4~8时与对照有显著差异;脯氨酸、可溶性蛋白、可溶性糖、丙二醛含量变化均与处理盐度呈现正相关,其中,脯氨酸、可溶性蛋白含量在各个处理盐度均与对照存在显著差异,可溶性糖含量在处理盐度为6和8时与对照存在显著差异.
Pot experiments were conducted to study the effects of NaCl stress on the growth of Lucuma nervosa A. DC. The chlorophyll, superoxidase (SOD), peroxidase (CAT), peroxidase (POD), free proline, soluble protein, soluble sugar, malondialdehyde and other physiological and ecological indicators as well as the actual salinity of peat soil, The results showed that under NaCl stress, the growth and chlorophyll synthesis of egg yolk were significantly inhibited, while the salt salinity was less than 0.19. The activity of SOD and POD increased with the increase of NaCl concentration (P <0.05). CAT activity was significantly different from that of the control when the salinity was 4 ~ 8. The contents of proline, soluble protein, soluble sugar and malondialdehyde were positively correlated with salinity. Among them, proline, Soluble protein content in each treatment salinity were significantly different from the control, soluble sugar content salinity 6 and 8 were significantly different from the control.