Effect of the phosphorus content in a nutrient solution on the expression of genes encoding phosphorus transporters in tomato grown on different substrates
Effect of the phosphorus content in a nutrient solution on the expression of genes encoding phosphorus transporters in tomato grown on different substrates
Effects of the phosphorus content in a nutrient solution (15 or 50 mg P dm-3), growing
substrate (rockwool or coconut fiber) and the plant growth stage (for roots: 71 or 113 days
after transplanting DAT; for leaves: 71 or 92 DAT) on the chemical composition of roots,
the phosphorus content in leaves and the expression of genes encoding proteins involved
in the transport of phosphorus from the medium to the plant were investigated in tomato
cv. Admiro F1 grown in a foil tunnel. A fertigation system without recirculation was used.
Regardless of the plant age and growing substrate, tomatoes fertilized with a nutrient solution
containing 50 mg P dm-3 had more phosphorus, iron, boron and copper in roots and
more phosphorus in leaves. Irrespective of the stage of plant growth and phosphorus level
in the medium, the content of almost all macro- and microelements was higher in roots
of plants grown in rockwool than in coconut fiber. The stage of plant growth significantly
affected the mineral composition of roots as well as the P content in tomato leaves. More
phosphorus was stored in roots of younger plants, whereas the phosphorus content was
lower in younger than in older leaves. Our analysis of the gene expression showed that
transporters encoded by LePT1-LePT4 were involved in phosphate nutrition. Expression of
the genes was generally (except LePT4) higher in plants treated by the solution containing
15 mg P dm-3 than in plants treated by 50 mg P dm-3. The expression of genes LePT2, LePT3
in roots of older plants (113 DAT) was generally higher than in young plants.
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