Instituto de Investigacións Agrobiolóxicas de Galicia (IIAG), Consejo Superior de Investigaciones Científicas (CSIC), Santiago de Compostela 15706, Spain.
Instituto de Investigacións Agrobiolóxicas de Galicia (IIAG), Consejo Superior de Investigaciones Científicas (CSIC), Santiago de Compostela 15706, Spain.
Sci Total Environ. 2014 Oct 1;494-495:1-8. doi: 10.1016/j.scitotenv.2014.06.102. Epub 2014 Jul 10.
The application of plant growth regulators (PGRs) or phytohormones could be an interesting option for stimulating biomass production of hyperaccumulating plants and, consequently, their metal phytoextraction capacity. The effect of exogenous applications of phytohormones (PGR) on the Ni phytoextraction capacity of four Ni hyperaccumulating species (Alyssum corsicum, Alyssum malacitanum, Alyssum murale and Noccaea goesingense) was evaluated. Four different commercially available phytohormones (B, C, K and P) based on gibberellins, cytokinins and auxins were applied to the plant aerial tissues. Each product was applied at three different concentrations (B1-3, C1-3, K1-3 and P1-3). The effect on biomass production was dependent on the species, the PGR type and the concentration at which it was applied. Two of the four products (K and P) consistently increased biomass production compared to untreated control plants in all four plant species. On the other hand, all four products led to a significant increase in the number of branches (and leaves in the case of N. goesingense) of all four species compared to control plants. Application of phytohormones generally led to a reduction in shoot Ni concentration. Nonetheless, in some cases as a consequence of the increase observed in biomass after the application of phytohormones a significant increase in the Ni phytoextraction efficiency was also observed (but this was species- and PGR type-dependent). The results show that PGRs can be successfully used to improve the growth and biomass production of hyperaccumulating species such as Alyssum and Noccaea. However, an increase in biomass did not always lead to a higher Ni removal, and the most effective PGR for increasing Ni removal was the IAA-based product.
植物生长调节剂（PGR）或植物激素的应用可能是刺激超积累植物生物量生产的一个有趣选择，从而提高其金属植物提取能力。本研究评估了外源施用植物激素（PGR）对四种镍超积累物种（Alyssum corsicum、Alyssum malacitanum、Alyssum murale 和 Noccaea goesingense）的镍植物提取能力的影响。将四种不同的市售植物激素（B、C、K 和 P）应用于植物地上组织，这些激素基于赤霉素、细胞分裂素和生长素。每种产品都应用了三种不同的浓度（B1-3、C1-3、K1-3 和 P1-3）。生物量的产生效果取决于物种、PGR 类型和应用浓度。四种产品中的两种（K 和 P）与未处理的对照植物相比，在所有四种植物中均能持续增加生物量。另一方面，与对照植物相比，四种产品都显著增加了所有四种植物的分枝数（和 N. goesingense 的叶片数）。与对照植物相比，所有四种产品都导致所有四种植物的地上部镍浓度降低。然而，在某些情况下，由于应用植物激素后观察到生物量增加，镍的植物提取效率也显著提高（但这取决于物种和 PGR 类型）。结果表明，PGR 可成功用于提高 Alyssum 和 Noccaea 等超积累物种的生长和生物量生产。然而，生物量的增加并不总是导致更高的镍去除率，而增加镍去除率最有效的 PGR 是基于 IAA 的产品。
