Aluminum-Induced Growth Stimulation in Relation to Calcium, Magnesium, and Silicate Nutrition in Melastoma malabathricum L.

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Effects of Al, Ca, Mg, and Si on the growth and mineral accumulation of M. malabathricum (Melastoma malabathricum L.), which is an Al accumulator plant, were investigated using the water culture method. Rice (Oryza satira L.) and barley (Hordeurn vulgare L.) were used as control plants. After Al application, growth was inhibited in barley, but stimulated in M. malabathrieum and rice. The growth of M. malabathrieum was not reduced by very low Ca and Mg concentrations (0.1 m_M Ca and 0.05 m_M Mg). However, it was depressed in the absence of Ca. Ca and Mg contents somewhat decreased by Al application, which was most evident in young leaves and roots. M. malabathricum accumulated more than 10,000 mg kg^<-1> Al in mature leaves, and more than 7,000 mg kg^<-1> even in the youngest leaf. Al content in leaves of M. malabathricum did not decrease by the Ca or Mg application, but slightly decreased by in the absence of Ca. Although Si is a strong ligand of Al in solution, in M. malabathricum, Si application hardly affected the growth, Al accumulation and nutrient uptake.
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