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| Effects of nickel on growth and nutritional ingredientsof water spinach（ Ipomoea aquatica Forsk.） |
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| DOI：10.16768/j.issn.1004-874X.2017.03.008 |
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| Abstract: |
| The paper investigated the effects of various concentrations of nickel on growth，urease activity and
some nutritional ingredients of hydroponic water spinach by supplying urea nitrogen as the only nitrogen source.
The results indicated that appropriate quantity of nickel could enhance the growth，urease activity and amino acids
synthesis of water spinach，while excessive nickel was toxic to water spinach. The treatment of 20 μg/L nickel
resulted in the highest fresh weight of water spinach，12.1% higher than that in control，while significant reduction
of water spinach fresh weight was detected with nickel supply higher than 320 μg/L，and significant plant damage
symptoms were observed with 1 280 μg/L nickel treatment. This results also showed that appropriate concentrations
of nickel（ 20-80 μg/L） could significantly increase the urease activity up to 13.6%，while the urease content also
raised up to 19.0%，but excessive nickel supply（ more than 640 μg/L） inhibited the urease activity. Physiological
analysis demonstrated that adequate nickel concentration（ 60 μg/L） firstly enhanced the specific activity of urease，
then participated in the urease synthesis to improve the urease yield，and ultimately improved the overall urease activity. This results also identified that the total amino acids content increased simultaneously as the concentrations
of nickel raised within the range of 0-40 μg/L with a highest increase of 44.7%，this effect became significant and
stable with nickel over 10 μg/L；the content of soluble carbohydrates in leaves significantly increased with treatments
of over-concentrated nickel（ more than 640 μg/L）. |
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