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mechanism of phloem transportthe efficiency and magnitude of translocation of food material are evident from the annual yields of various crops and
types of transport process in sieve tubesthe metabolites of all the mesophyll cells around the sieve elements join in a common pool to load via the
categories of phloem transportessentially the phloem transport can be subdivided into the following the loading of the organic nutrients from the
necessity of transport in phloemleaves produce photoassimilates and support various tissues including roots the excess photoassimilates and
transport in phloemthe basic necessities of plants water are taken up by the roots another purpose served by the roots is to absorb water soluble
photosynthesisphotosynthesis - the process by which plants utilise energy from sunlight to convert carbon dioxide and water for the synthesis of
cobalt co - micronutrientsthe co concentration in the dry matter of plants grown in soil normally lies around 002 to 05 ppm in soils the content
chlorine cl - micronutrientsthe role of cl- in plant is not clearly understood cl- is required in hill reaction the water splitting reaction of
molybdenum momo is absorbed as molybdate moo2-4 ion by plants its uptake can be competitively reduced by so2-4 the requirement of plants for mo is
zinc zn - micronutrientsin its function in some enzyme systems zn2 resembles mn2 in that it brings about substrate binding and conformational changes
sulphur s - macronutrientssulphur is present in the soil in inorganic and organic forms in most soils organically bounds is the major s reservoir the
potassium k - macronutrientsthe main source of k for plants comes from withering of k containing minerals potassium released by withering dissolves
phosphorus p - macronutrientsin soil phosphorus occurs almost exclusively in the form of orthophosphate substantial amount of p is associated with
long distance transportonce in the xylem vessels the transport of the mineral elements from the root to the shoot is driven by the gradient of
driving force - mineral nutritionlet us now find out what is the driving force involved in protein mediated transport many membrane transport
characteristics of nutrient uptakethese results show certain characteristics of nutrient uptake selectivity certain mineral elements are taken up
changes in the ions the concentration of potassium phosphate and nitrate declined significantly in the bathing medium within four days the
nutrient absorptionexcept for carbon oxygen and hydrogen which are provided by co2 and water all the other elements essential for plants are provided
biochemical function - essential elementselements mg mn k ca and fe are cofactors for many enzymatic reactions fe is carrier of electrons in electron
structural function - essential elementsthe elements nitrogen phosphorus and sulphur absorbed from the soil are essential components of amino acids
osmotic function - essential elementsplant cells generally contain mineral ions 10 to 1000 times higher in concentration than the surrounding soil
criteria of essentialityamon and stout as early as 1939 suggested certain criteria that an element must fulfil in order to be classified as essential
nutrient elements of plantslet us first find out the chemical composition of plants and see which element nature has selected to support their
normal 0 false false false en-in x-none x-none
distribution of stomatathere are two parameters normally used for expressing the distribution of stomata stomatal frequency the number of stomata per