Magnesium (Mg)
In the form of Mg
2+
, magnesium activates the enzymes related to breathing,
photosynthesis and synthesis of DNA and RNA. It is a major component
of chlorophyll that performs photosynthesis. Its deiciency causes chlorosis
between veins of leaves. It begins with old leaves because of the mobility of
magnesium. Severe deiciency causes leaves to turn yellow or white.
Manganese (Mn)
In the form of Mn
2+
, it activates a few enzymes in plant cells. Decarboxylase
and dehydrogenase included in the tricarboxylic acid cycle (TCA cycle) are
speciically activated by manganese. It plays an important role in photosyn-
thetic reaction that generates oxygen in water. If it is deicient, small
necrotic spots develop and necrosis occurs between veins of leaves.
Do'stlaringiz bilan baham: |