TRA CE ELEMENTS IN PLANT NUTRITION
Some trace elements as copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), boron (B) and
molybdenum (Mo) are for a long time considered plant nutrients. Some of them as nickel (Ni) and
cobalt (Co) may already considered essential to plant growth, since Ni is a component of the
enzyme urease and Co is present in some enzymes as dehydratases, mutases, transpherases,
phosphatases. Some trace elements have no function in plant nutrition as cadmium (Cd), chromium
(Cr), mercury (Hg), lead (Pb), barium (Ba), tin (Sn), arsenium (As), selenium (Se).
If in available forms in soil, trace elements may be uptaken and accumulated in plants, what is
hazardous for animal and man health. It is a way trace elements enter the man chain food. Trace
elements absorbed by sugarcane and oil plants nay be transferred to the biofuel and affect its
Since ingested by humans, trace elements tend to accumulate in the organism and cause several
health problems, depending on the element. Some of them, as Pb and Hg, cause neurotoxic
disorders which can culminate with death. So, all eforts may be due so that toxic trace elements to
man do not be in available forms to plant in soils or do not get food parts of the plants as grains.
Today is somewhat known that plants may have mechanisms to protect them against absorption or
translocation of trace elements to the shoot. It is the case of the production of chelatins, the ability
of stocking trace elements in subcell compartments as vacuoles and even the excretion of absorbed
trace elements. In this way, even growing in a soli reach in available trace elements, the plants do
not present toxicity symptoms. On the other hand, some plants can absorb trace elements in a great
quantity and do not present toxicity symptoms or have their growth affected. These plants may be
used for remediation of polluted soils, a process named phytoremediation.
In the case of the trace elements essential to plant growth, they must be in available form in soils in
the moment the plants need them for a good growth and production. If the soil is not able to supply
them to the plants in quantity and in the time the plants need them, the plants will present deficiency
symptoms, the growth will be affected and also the production.
In this Special Symposium various aspects of the interaction of plants with trace elements will be
considered in order to get informations for a good plant growth and production and also to decrease
the risks of man intoxication by ingesting food contaminated with toxic trace elements.
Aims od the Symposium
The Symposium aims to discuss the kinetic and the mechanisms of trace elements absorption by
plants, the translocation and the redistribution of the uptaken elements and their accumulation in
food plant parts. It is also aimed to discuss the mechanisms of plant protection against trace element
toxic effects and the use of plants with the capacity of trace elements bioaccumulation for the
phytoremediation of polluted areas. The symptoms of trace elements deficiency and toxicity is also
the objective of this Symposium.
Symposium is addressing
The Symposium is addressed to young and senior researches interested in discussing the different
aspects related to the absorption and accumulation of trace elements in plants, considering the
effects on plant growth and the hazardous to man health. Other people also interested in the
behavior of plants cropped in soils contaminated with trace elements will welcome to the
The Symposium will facilitate discussions on solutions to adequately supply trace elements that
are plant nutrients and to avoid the absorption and accumulation of those that are toxic to plants
an humans and that represent risks to the environment.
Themes for discussion in the Symposium
Some themes for discussion in the Special Symposium on Trace elements in plant nutrition are:
1. Sugarcane absorption of trace elements and the quality of the biofuel.
2. Oil plants trace elements absorption and the quality of biodiesel.
3. Kinetic of trace elements absorption, translocation and redistribution by annual and perennial plants.
4. Mechanisms of plant protection against toxic trace elements.
5. Nutritional disorders caused by the deficiency of trace elements that are plant nutrient or by toxic
6. Trace elements and plant enzyme activity.
7. Trace elements accumulation in plant food parts.
8. Chemistry and biochemistry methods to estimate trace elements availability to plants.
9. Chemistry and biochemistry methods to evaluate plant nutritional state related to trace elements
10. Competition of trace elements and other metals for plant absorption .
11. Trace elements and physiological process in plants.
12. Plants for phytoremediation.
13. Leaf diagnosis related to trace elements.