The effect of amino acids on nitrate uptake by wheat roots
To identify feedback signal(s) controlling nitrate uptake by wheat roots, the effects of 13 amino acids on time course of net nitrate influx have been investigated. A new non-invasive technique of measuring net nitrate influx with a high time resolution of minutes has enabled us to make this comparison. The results showed that glutamate caused a rapid and large decrease of net nitrate influx by roots. Aspartic acid, asparagine, glutamine caused a relatively slow decrease of net nitrate influx with a lag of 0.5–1.5 h. Other amino acids had a small effect or even no effect. It is speculated that glutamate is most likely to be a negative feedback signal.
Keywordsamino acids nitrate uptake non-invasive signal Triticum aestivum L.
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