根区温度对辣椒幼苗生理特性的影响

Effects of Root Zone Temperature on Physiological Characteristics of Pepper Seedlings

为探讨冬季日光温室土壤温度对作物水分吸收、保护酶、渗透调节物质以及质膜透性的影响,以辣椒品种长金、迅驰37-74和运驰37-82为研究试材,对20-22,14-16,10-12℃3个温度处理下辣椒幼苗茎叶和根系的含水量,叶片超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）活性,脯氨酸（Pro）、丙二醛（MDA）含量和渗透电解率质膜透性进行了测定。结果表明,随着根区温度的下降,辣椒幼苗含水量呈现下降趋势,其中10-12℃处理含水量最低;叶片SOD、POD和CAT活性表现为下降的趋势;Pro、MDA、超氧阴离子含量以及电解渗透率表现为逐渐升高的趋势。综上所述,10-12℃处理对辣椒幼苗生理生化特性和含水量影响程度明显高于处理20-22,14-16℃,以生理生化特性和含水量为衡量指标,根区温度14℃及以上时,辣椒植株可以保持正常的生长发育。

To probe into the sunlight greenhouse soil temperature in the winter stress on crop water content,protective enzymes,osmolyte and membrane permeability in pepper,we comparatively studied three treatment（ 20-22,14- 16,10- 12 ℃）,the water contents of seedling stems and roots,the activities of super oxede-dismutase（ SOD）,peroxidase（ POD）,catalase（ CAT）,proline（ Pro）,malondialdehyde（ MDA） and electrolytic permeability contents were determined by using Changjin,Xunchi 37- 74 and Yunchi 37- 82 in pepper. The results showed that as the root zone temperature dropped the seedling water content appeared the tendency of decline,among water content was the lowest in 10- 12 ℃ treatment. The activities of SOD,POD and CAT in leaf appeared the trend of decline. The contents of Pro,MDA and electrolytic perme ability appeared the trend of rising. In a word,10- 12 ℃treatment on influencing degree of water content,physiological and biochemical characteristics in pepper seedlings was significantly higher than 20- 22,14- 16 ℃ treatments. Taking physiological and biochemical characteristics as measurement index,we concluded that pepper could still keep its normal growth and development when the root zone temperature over 14 ℃.