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首页> 外文期刊>Environmental Science & Technology >Transgenic Indian mustard overexpressing selenocysteine lyase or selenocysteine methyltransferase exhibit enhanced potential for selenium phytoremediation under field conditions
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Transgenic Indian mustard overexpressing selenocysteine lyase or selenocysteine methyltransferase exhibit enhanced potential for selenium phytoremediation under field conditions

机译：转基因印度芥菜过表达硒代半胱氨酸裂解酶或硒代半胱氨酸甲基转移酶在田间条件下表现出提高硒植物修复的潜力

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摘要

Two new transgenic Indian mustard [Brassica juncea (L.) Czern.] lines were tested under field conditions for their ability to accumulate selenium (Se) from Se- and boron-contaminated saline sediment. The transgenic lines overexpress genes encoding the enzymes selenocysteine lyase (cpSL) and selenocysteine methyltransferase (SMT), respectively. In the first Spring planting, cpSL, SMT, and wildtype plants (WT) were compared, while SMT and WT were compared in a second, Fall planting. In the Spring planting, shoots of the cpSL transgenic plants accumulated 2-fold more Se (p < 0.01), had 1.8 times higher leaf Se concentrations (p < 0.01), and grew better on contaminated soil than WT. The SMT plants had a 1.7-fold higher leaf Se concentration than WT (p < 0.05). In the Fall planting, the SMT transgenic plants accumulated 1.6-fold more Se in their shoots than WT (p < 0.01) with Se concentrations being higher in both leaves and stems. These results conclusively demonstrate that cpSL and SMT transgenic lines have significantly greater Se phytoremediation potential than wildtype Indian mustard. Further, this study confirms the importance of field testing for evaluating future transgenic lines.
机译：在田间条件下测试了两个新的转基因印度芥菜[Brassica juncea（L.）Czern。]品系从受硒和硼污染的盐沉积物中累积硒（Se）的能力。转基因株系过表达分别编码硒代半胱氨酸裂解酶（cpSL）和硒代半胱氨酸甲基转移酶（SMT）的基因。在第一个春季种植中，比较了cpSL，SMT和野生型植物（WT），而在第二个秋季种植中比较了SMT和WT。在春季播种中，cpSL转基因植物的芽积累了2倍以上的硒（p <0.01），叶硒含量高1.8倍（p <0.01），并且在被污染的土壤上比WT生长更好。 SMT植物的叶硒浓度比野生植物高1.7倍（p <0.05）。在秋季播种中，SMT转基因植物的芽中硒的积累量比野生型植物高1.6倍（p <0.01），并且叶片和茎中的硒含量更高。这些结果最终证明，cpSL和SMT转基因品系比野生型印度芥菜具有更高的Se植物修复潜力。此外，这项研究证实了现场测试对评估未来转基因品系的重要性。

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