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在温室中研究了La3+对UV-C辐射胁迫下番茄幼苗保护酶活性及光合色素的影响。结果表明:UV-C胁迫降低了番茄幼苗SOD和POD活性,增加了膜脂过氧化产物MDA含量。La3+对UV-C胁迫下番茄幼苗SOD和POD有显著的调控作用。与单一UV-C胁迫组相比,番茄幼苗SOD活性平均增加了38.03%,POD活性平均增加了20.43%,番茄幼苗MDA含量平均降低18.63%,表明La3+有效防止了番茄幼苗细胞膜脂过氧化作用,一定程度上缓解了番茄幼苗膜系统的伤害。La3+能够显著缓解UV-C辐射胁迫对光合色素的降解作用。与单一UV-C胁迫组相比,番茄幼苗叶绿素a平均提高了17.65%,叶绿素b平均提高了17.11%,类胡萝卜素含量维持较高水平。综合比较各项指标,30 mg.L-1LaCl3在UV-C辐射胁迫下对番茄幼苗的防护效果好于60 mg.L-1LaCl3。
The effects of La3 + on protective enzyme activities and photosynthetic pigments in tomato seedlings under UV-C radiation stress were studied in greenhouse. The results showed that UV-C stress reduced the activities of SOD and POD in tomato seedlings and increased the MDA content of membrane lipid peroxidation products. La3 + could significantly regulate the SOD and POD of tomato seedlings under UV-C stress. Compared with single UV-C stress group, the activity of SOD in tomato seedlings increased by 38.03% on average and the activity of POD increased by 20.43% on average, while the content of MDA in tomato seedlings decreased by 18.63% on average, indicating that La3 + could effectively prevent lipid peroxidation of tomato seedling cells, To some extent, alleviate the damage of tomato seedling membrane system. La3 + can significantly alleviate the degradation of photosynthetic pigments under UV-C radiation stress. Compared with the single UV-C stress group, the average chlorophyll a of tomato seedlings increased by 17.65%, the average chlorophyll b increased by 17.11%, and the content of carotenoids remained at a high level. Comprehensive comparison of the indicators, 30 mg.L-1LaCl3 protective effect of tomato seedlings under UV-C radiation stress better than 60 mg.L-1LaCl3.