In plant, not all
tissues are at the same nutrient status during times of stress. Leaves on the
same plant that are exposed to different environmental conditions such as light
condition or those of different ages or those that may stay for a very long
time may have considerable differences in their nutrient status. Mineral
nutrients are most acquired by the roots and translocated throughout the plant.
The distance of any part of the plant to the roots will influence the
availability of nutrient, particularly in the case of the less mobile
nutrients. Plants which recover from nutrient deficiency start their recovering
from the root and then conductive tissues recovering. For instance, in the case
of plant which is recovery from Fe deficiency, it is common to see the veins of
the plant re-green while the interveinal tissue remains chlorotic and
Fe-deficient.
In order to sustain
maintenance of rapid, optimal growth, all plant tissues must have a favorable
nutrient status. Although a plant may be marginally low in a number of
nutrients, only one nutrient at a time will limit the overall growth. However,
if the supply of that limiting nutrient is increased even slightly, the
resulting increase in the plant growth will increase the demand for all other
nutrients and as well as another nutrient, the next lowest in the availability
of nutrient; will become limited in the plant.
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