Influence of manganese deficiency on phosphorus fractions in lemon leaves

In this paper the evolution of total phosphorus, as well as its more interesting fractions (inorganic‐P, organic‐P, lipidic‐P, P‐RNA, P‐DNA and proteic‐P) are studied over an one year period, in Verna lemon tree leaves, not only greenones, but also on others with slight manganese deficiency symptoms, as well as with medium and strong manganese chlorosis. The results show that manganese notably influences the concentration of the before mentioned phosphorus compounds. So the total phosphorus levels, soluble acid phosphorus and inorganic phosphorus decrease according to the intensity of the chlorosis. The yearly fluctuations of the both lipidic and RNA phosphorus, fractions act in the same way. Nevertheless, the influence of manganese on the P‐DNA and proteic‐P is not clear.