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Abscisic acid relations of plants grown on tungsten enriched substrates

机译：在富含钨的基质上生长的植物的脱落酸关系

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The effect of tungsten as a potential inhibitor of ABA biosynthesis in plants was tested both under controlled conditions in the greenhouse or laboratory and in the field at a site naturally enriched with tungsten. Although as predicted in all cases the activity of aldehyde oxidase was strongly inhibited by tungsten, in well watered, greenhouse-grown maize plants increased concentrations of tungsten did not reduce ABA concentration in tissues. Depending on the time of incubation, mostly an accumulation due to an increased net ABA synthesis could be observed. Under drought stress, however, tungsten may have an inhibitory effect on ABA accumulation. Field experiments with drought-stressed clover and dandelion plants from a habitat close to a former tungsten mine confirm those of the greenhouse and laboratory. The ineffectiveness of tungsten in decreasing ABA levels in well-watered plants and its minimal effects in inhibiting ABA accumulation of droughted plants indicate that it is unsuitable as an inhibitor of ABA biosynthesis.
机译：在温室或实验室的控制条件下以及在田间自然富含钨的地方，都在受控条件下测试了钨作为植物ABA生物合成潜在抑制剂的作用。尽管如在所有情况下所预测的那样，钨强烈抑制了醛氧化酶的活性，但是在水分充足，温室栽培的玉米植株中，钨的浓度升高并未降低组织中的ABA浓度。根据温育时间的不同，主要可以观察到由于净ABA合成增加而产生的积累。但是，在干旱胁迫下，钨可能对ABA的积累具有抑制作用。在靠近原钨矿的栖息地中，对干旱胁迫的三叶草和蒲公英植物进行了田间试验，证实了温室和实验室的植物。钨在水分充足的植物中降低ABA水平的无效作用及其在抑制干旱植物ABA积累中的最小作用表明它不适合作为ABA生物合成的抑制剂。

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