a School of Life Sciences , Lanzhou University , Lanzhou , China.
b College of Horticulture and Landscape , Yunnan Agricultural University , Kunming , China.
Int J Phytoremediation. 2019;21(1):4-13. doi: 10.1080/15226514.2018.1523867. Epub 2019 Jan 14.
A field experiment in which a hyperaccumulator (Arabis alpina) was intercropped with winter crop (Vicia faba), was conducted to understand effect of the root exudates on the content and accumulated amounts, sub-cellular distribution of Cd and Pb of the intercropped plants during the ripening period of V. faba (120 d after sowing). The results showed that contents of soluble sugars exuded from the roots of intercropped A. alpina were 67.6% less than that of the monocropped plant, whereas contents of free amino acids was 57.9% greater. The total contents of organic acids exuded from roots of intercropped A. alpina and V. faba were 578.8% and 37.8% greater than that of monocropped plants, respectively. The contents of tartaric acid and malic acid exuded by roots of intercropped A. alpina were greater 31.9 times and 15.9 times than those of monocropped A. alpina, respectively. The contents and accumulated amounts of Cd and Pb in intercropped A. alpina were greater than those of monocropped A. alpina. The contents of Pb bound to organic matter in cell walls, cytoplasm and organelles of intercropped plants were greater than those of monocropped plants. These results demonstrate that increases in accumulated amounts of Pb and Cd caused by intercropping were closely related to migration of Cd and Pb in plants mediated by the composition and content of the root exudates.
进行了一项田间试验，其中超富集植物（Arabis alpina）与冬季作物（Vicia faba）间作，以了解根分泌物在 V. faba 成熟期间（播种后 120 天）对间作植物中 Cd 和 Pb 的含量和积累量、亚细胞分布的影响。结果表明，与单作植物相比，间作 A. alpina 根分泌的可溶性糖含量减少了 67.6%，而游离氨基酸含量增加了 57.9%。间作 A. alpina 和 V. faba 根系分泌的有机酸总量分别比单作植物增加了 578.8%和 37.8%。间作 A. alpina 根系分泌的酒石酸和苹果酸含量分别比单作 A. alpina 增加了 31.9 倍和 15.9 倍。间作 A. alpina 中 Cd 和 Pb 的含量和积累量均高于单作 A. alpina。间作植物细胞壁、细胞质和细胞器中与有机物结合的 Pb 含量高于单作植物。这些结果表明，间作引起的 Pb 和 Cd 积累量的增加与根分泌物的组成和含量介导的植物中 Cd 和 Pb 的迁移密切相关。
