Ni requirement of the hyperaccumulator Alyssum murale

Guido Fellet, Ramon Torres, Tiziana Centofanti, Luca Marchiol, Rufus L. Chaney

Research output: Contribution to journalConference articlepeer-review

Abstract (may include machine translation)

Among the hyperaccumulators, Alyssum murale grown in serpentine soils can accumulate more than 20 g kg-1Ni in its dry shoots at flowering (Reeves and Baker, 2000) while normal plants suffer from phytotoxicity when shoot Ni exceeds 25-50 mg kg-1. Ni is a proven micronutrient for higher plants in the activation of urease which is used by the plants to hydrolyze urea and ureides to release NH3. For this reason, Ni deficiency causes toxicity symptoms due to the accumulation of urea within plant tissues. Ni hyperaccumulators such as Alyssum murale are extremely interesting as plants that may allow commercial phytomining of Ni the value of which has increased in recent years. Because some Alyssum spp. are capable of accumulating such higher Ni concentration than normal plants, we questioned whether their Ni requirement might also be higher compared to nonhyperaccumulators. We compared the behavior of two hyperaccumulators species of the Alyssum genus (A. murale and A. corsicum) and two non-hyperaccumulators (A. montanum and tomato) when exposed to different levels of Ni2+activity in chelator-buffered nutrient solutions containing urea as nitrogen source to define the Ni requirement.

Original languageEnglish
Pages (from-to)85-86
Number of pages2
JournalItalian Journal of Agronomy
Volume3
Issue number3
StatePublished - 2008
Externally publishedYes
Event10th Congress of the European Society for Agronomy, 2008 - Bologna, Italy
Duration: 15 Sep 200819 Sep 2008

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