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探讨低累积玉米品种与超累积植物小花南芥间作体系对铅污染的生理响应机制。以陶粒为培养基质,研究铅(400 mg/kg)胁迫对玉米和小花南芥间作体系的植株生物量、抗氧化酶活性、丙二醛及铅含量的影响。结果表明:间作体系下,玉米叶的生物量比单作显著增加24.5%,小花南芥根、茎和叶的生物量显著增加16.3%、32.8%和29.8%;与单作相比,间作玉米根和叶丙二醛含量显著下降42.58%和74.06%,间作小花南芥根和茎丙二醛含量显著下降61.98%和56.64%;间作玉米叶的SOD、POD和CAT活性比单作显著增加49.15%、113.98%和63.98%,小花南芥增加40.14%、73.96%和73.72%;间作玉米根的铅含量显著增加77.29%,转运系数下降47.27%;小花南芥地上部和地下部铅含量显著增加49.57%和48.64%。综上所述,间作体系促进了小花南芥地上部和地下部铅的含量,抑制铅在玉米体内的转移,玉米和小花南芥根和叶中抗氧化酶活性提高来减轻铅的毒害作用。
To investigate the physiological response mechanism of lead accumulation in low-yielding maize cultivars and super-accumulating plantlets. The effects of lead stress (400 mg / kg) on plant biomass, antioxidant enzyme activities, malondialdehyde and lead contents in intercropping system of Maize and The results showed that the biomass of maize leaf increased significantly by 24.5% and the biomass of roots, stems and leaves increased significantly by 16.3%, 32.8% and 29.8%, respectively. Compared with single crop, intercropping corn The contents of malondialdehyde in roots and leaves decreased significantly by 42.58% and 74.06%, while the contents of MDA and MDA decreased significantly by 61.98% and 56.64% in intercropped plants. The activities of SOD, POD and CAT in intercropped maize leaves were significantly increased 49.15 %, 113.98% and 63.98%, respectively. The contents of Pb in wheat and Arabidopsis plants increased by 40.14%, 73.96% and 73.72%, 77.29% and 47.27% 49.57% and 48.64% respectively. In summary, the intercropping system promoted the lead content in shoots and roots, inhibited the transfer of lead in maize, and enhanced the activities of antioxidant enzymes in roots and leaves of maize and flower florets to reduce the toxic effects of lead.