不同浓度氮素对甜椒老化苗形成的影响

Effects of Different Nitrogen Concentration on Ageing Formation of Sweet Pepper Seedlings

以甜椒为试材,用50孔穴盘进行育苗,设置6个氮素浓度:0 mg.L-1(T1)、94 mg.L-1(T2)、140 mg.L-1(T3)、210 mg.L-1(T4)、315 mg.L-1(T5)、472.5 mg.L-1(T6),研究不同浓度氮素处理对甜椒老化苗形成的影响。结果表明:适宜的氮素浓度可以降低甜椒幼苗木质素含量,但是高浓度氮素却使甜椒幼苗体内的木质素含量增加,T6处理甜椒幼苗木质素含量较T4处理增加2.09倍。氮素浓度为210 mg.L-1(T4)时,甜椒幼苗木质素含量最低,MDA含量下降,而SOD、POD活性升高,并且壮苗指标高于其他处理,说明氮素浓度在210 mg.L-1时,甜椒幼苗抗老化能力增强。

The research used six nitrogen concentrations, they were 0 mg . L^-1 （T1） , 94 mg . L^-1 （T2）, 140mg.L^-1 （T3）, 210mg.L^-1 （T4）, 315 mg.L^-1 （TS） and472.5 mg.L^-1 （T6）. Sweet pepper （ Capsicum annuum L. var. grossum Bailey） was taking as experimental material to study the effects of different nitrogen concentration on its seedling ageing formation. The results showed that ageing degree had positive relation with lignin content, whereas the lignin content was affected by nitrogen concen- tration. Appropriate nitrogen concentration could reduce lignin content, while the higher nitrogen concentration could enhance the lignin content. The lignin content in T6 treatment was 2.09 times of that in T4 treatment. When the nitrogen concentration was 210 mg . L^-1 （T4） , the lignin content in sweet pepper seedling was the lowest. When MDA content reduced, the activities of SOD, POD increased and strong seedling index was higher than other treatments. It indicates when nitrogen concentration is 210 mg . L^-1 （T4） , the anti-ageing strength of sweet pepper seedling is increased.