NaCl胁迫下苯丙烯酸在黄瓜幼苗-土壤系统内的积累

采用盆栽试验，以耐盐黄瓜品种‘津绿5号’和盐敏感品种‘津优1号’为试材，研究了NaCl（585 mg·kg^-1土）胁迫下不同浓度苯丙烯酸对黄瓜幼苗-土壤系统内苯丙烯酸积累的影响.结果表明： 苯丙烯酸施用浓度是影响土壤和黄瓜植株中苯丙烯酸含量的主要因子；除最高浓度(200 mg·kg^-1土)外，其他处理的黄瓜植株苯丙烯酸含量均随处理浓度的增加而增加.盐分胁迫使苯丙烯酸的毒性作用增强，在中低浓度处理下，黄瓜植株中苯丙烯酸含量升高；在高浓度处理下，黄瓜幼苗生长量下降并导致植株中苯丙烯酸含量降低；‘津绿5号’在最高浓度(200 mg·kg^-1土)处理时苯丙烯酸含量下降，而‘津优1号’从100 mg·kg^-1土浓度就开始下降，反映出两个黄瓜品种的耐盐性差异.在黄瓜植株各部位中，苯丙烯酸主要在叶片中积累；而在黄瓜植株-土壤系统内，苯丙烯酸主要在土壤中积累.

Accumulation characteristics of applied cinnamic acid in cucumber seedling-soil system under NaCl stress

Taking cucumber cultivars‘Jinlv No.5’ (salt-tolerant) and ‘Jinyou No.1’ (salt-sensitive) as test materials, a pot experiment was conducted to study the effects of applying cinnamic acid on the accumulation of applied cinnamic acid in cucumber seedling-soil system under NaCl (585 mg·kg^-1 soil) stress. The concentration of applied cinnamic acid was the main factor affecting the accumulation of the exogenous cinnamic acid in the cucumber plant and soil. With the increasing concentration of applied cinnamic acid, except in the treatment of highest concentration (200 mg·kg^-1 soil) cinnamic acid, the total content of cinnamic acid in cucumber plant was increased. NaCl stress enhanced the toxicity of cinnamic acid. In the treatments of low and medium concentration cinnamic acid, the cinnamic acid content in cucumber plant increased; whereas in the treatments of high concentration cinnamic acid, the decline of the seedlings growth was observed, and led to the decrease of the cinnamic acid content in the plant. The content of cinnamic acid in ‘Jinlv No.5’ plant decreased at the concentration of applied cinnamic acid being >200 mg·kg^-1 soil, while that in ‘Jinyou No.1’ started to decrease when the concentration of applied cinnamic acid was >100 mg·kg^-1 soil, reflecting the discrepancy in salt tolerance of the two cultivars. For the cucumber plant, its leaf had the highest content of cinnamic acid. In the cucumber seedling-soil system, most of applied cinnamic acid was mainly accumulated in soil.