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以西兰花(Brassica oleracea L.var.italica Planc)为试验材料,采用叶面喷施K2Si O3的方法,研究了硅对不同浓度铬胁迫下西兰花幼苗地上部分生长和铬积累量的影响。结果表明,50 mg·L-1铬胁迫处理促进了西兰花的生长,西兰花幼苗的苗高、单株鲜重、SOD活性、POD活性等均较对照提高,MDA含量降低;当铬浓度超过100 mg·L-1后,随铬处理浓度的增加,西兰花的苗高、单株鲜重及SOD活性、POD活性等均逐渐降低,MDA含量增加。由统计分析可知,Cr6+胁迫显著影响西兰花生长的浓度为100 mg·L-1。1~100 mg·L-1Cr6+可有效促进植株对Cr6+吸收与积累,但200 mg·L-1Cr6+处理西兰花对铬的吸收量减少。喷施1.5 mmol·L-1K2Si O3处理后明显提高了西兰花幼苗的苗高、单株鲜重以及SOD、POD活性,降低了MDA含量和铬的积累,减轻了铬胁迫对西兰花的毒害。
The effect of silicon on the growth and the accumulation of Cr in broccoli seedlings under different concentrations of chromium stress was studied using the leaves of Brassica oleracea L.var.italica Planc as test material and K2Si O3 as foliar spray. The results showed that the treatment of 50 mg · L-1 Cr promoted the growth of broccoli. The seedling height, fresh weight per plant, SOD activity and POD activity of Broccoli seedlings increased compared with the control, and the MDA content decreased. When the chromium concentration exceeded After treated with 100 mg · L-1, the seedling height, fresh weight per plant, SOD activity and POD activity of broccoli decreased gradually and the content of MDA increased with the increase of chromium concentration. Statistical analysis showed that Cr6 + stress significantly affected the growth of broccoli at a concentration of 100 mg · L -1 -100 mg · L-1 Cr6 +, which could effectively promote the uptake and accumulation of Cr6 + in plants. However, treatment with 200 mg · L-1Cr6 + Reduced absorption of chromium. Spraying 1.5 mmol·L -1 K 2 Si O 3 significantly increased seedling height, fresh weight per plant and activities of SOD and POD, decreased MDA content and chromium accumulation, and alleviated the toxicity of chromium stress to broccoli.