Pedosphere 27(3): 638--644, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Intercropping with Solanum nigrum and Solanum photeinocarpum from two ecoclimatic regions promotes growth and reduces cadmium uptake of eggplant seedlings
TANG Yi1, HE Juan2, YU Xuena2, XIE Yongdong2, LIN Lijin1, SUN Guochao2, LI Huanxiu1, LIAO Mingan2, LIANG Dong1, XIA Hui1, WANG Xun1, ZHANG Jing2, LIU Zejing2, TU Lihua3,LIU Li4
1Institute of Pomology and Olericulture, Sichuan Agricultural University, Wenjiang District, Chengdu 611130 (China)
2 College of Horticulture, Sichuan Agricultural University, Wenjiang District, Chengdu 611130 (China)
3 College of Forestry, Sichuan Agricultural University, Wenjiang District, Chengdu 611130 (China)
4 Personnel Department, Sichuan Agricultural University, Xingkang Road 46, Yaán 625014 (China)
ABSTRACT
      Soil contamination by heavy metals is a serious environmental problem worldwide, and reduction of heavy metal accumulation in vegetables grown on contaminated land is a matter of urgency. A pot experiment was conducted to study the effects of intercropping with the Cd hyperaccumulators Solanum nigrum and Solanum photeinocarpum from two ecoclimatic regions, Ya'an and Chengdu, Sichuan Province, China, on the growth and cadmium (Cd) uptake of eggplant ( Solanum melongena L.).The biomass, photosynthetic pigment contents, and activities of antioxidant enzymes of eggplant were enhanced by intercropping.The biomass of eggplant was the highest after intercropping with S. photeinocarpum from Ya'an, but did not differ significantly from that after intercropping with S. nigrum from Chengdu. The shoot Cd content of eggplant was significantly reduced by intercropping with the hyperaccumulators, which ranked as follows: S. nigrum from Chengdu $>$ S. nigrum from Ya'an $>$ S. photeinocarpum from Chengdu $>$ S. photeinocarpum from Ya'an, with the decreases being 19.60%, 14.36%, 9.66%, and 6.42%, respectively, as compared with the control. The lowest shoot Cd content and translocation factor of eggplant were attained after intercropping with S. nigrum from Chengdu.Therefore, it was feasible to intercrop eggplant with S. nigrum and S. photeinocarpum on Cd-contaminated soil.
Key Words:  heavy metal, hyperaccumulator, phytoremediation, soil contamination, translocation factor
Citation: Tang, Y., He, J., Yu, X., Xie, Y., Lin, L., Sun, G., Li, H., Liao, M., Liang, D., Xia, H., Wang, X., Zhang, J., Liu, Z., Tu, L. and Liu, L. 2017. Intercropping with Solanum nigrum and Solanum photeinocarpum from two ecoclimatic regions promotes growth and reduces cadmium uptake of eggplant seedlings. Pedosphere. 27(3): 638-644.
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