NaCl胁迫对不同品种辣椒幼苗生理生化特性的影响

Effect of NaCl stress on physiological characteristics of seedlings of different pepper varieties

【目的】测定NaCl胁迫下2种辣椒生理生化指标的变化,研究2个辣椒品种对盐胁迫响应的生理生化机制。【方法】以"强丰7301"和"秋艳"2个辣椒品种为材料,采用沙培法研究不同浓度NaCl(0(CK),50,100,150,200,250mmol/L)胁迫对辣椒幼苗叶片丙二醛(MDA)、游离脯氨酸(Pro)含量和抗氧化酶(SOD、POD、CAT)活性的影响。【结果】当胁迫时间相同时,随着NaCl浓度的增加,2个辣椒品种幼苗叶片中的MDA和Pro含量总体呈上升趋势,抗氧化酶(SOD、POD、CAT)活性呈先升高后下降的趋势。【结论】高浓度(200,250mmol/L)NaCl处理会使辣椒植株逐渐表现出盐害症状;在相同浓度NaCl处理下,"秋艳"的盐害程度较"强丰7301"重。

【Objective】To provide theoretical guidance for application of peppers,this experiment studied the physiological and biochemical mechanism of two pepper varieties under salt stress.【Method】Taking two pepper varieties('Qiangfeng 7301'and'Qiuyan')as materials and using sand cultivation method,this paper studied the effects of NaCl with different concentrations(0(CK),50,100,150,200,and 250mmol/L)on contents of MDA and proline and activities of antioxidant enzymes(SOD,POD,and CAT)of seedlings.【Result】With the increase of NaCl concentration,the contents of MDA and proline in seedling leaves of both peppers increased,while the activities of antioxidant enzymes(SOD,POD,and CAT)increased initially and then decreased.【Conclusion】High salt concentrations(200and 250mmol/L)induced salt harm symptom of both pepper varieties.At same NaCl concentrations,'Qiuyan'had stronger salt harm degree than'Qiangfeng 7301'.