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Mineral Nutrition

Mineral Nutrition logoSubject: Biology    Exam: NEET-UG

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Important Points

Boron is the chemotropic factor guiding the course of growing pollen tube within the pistil towards the egg apparatus.
Contemporary understanding is that the uptake of mineral ions is mostly endergonic (energy requiring) selective and can be against the concentration gradient. Uptake of certain mineral anions (like chloride and nitrate) may however be largely passive.
Passive (and non-selective) absorption concept can not explain as to why the uptake is inhibited by the presence in soil of respiratory inhibitors such as cyanides and azides, phenomenon of salt respiration, and also the selectivity of ionic uptake.
Nitrogenase is extremely vulnerable to oxygen, and therefore nitrogenase-contraining sites are appropriately protected against oxygen-infiltration, as for instance a thick insulatory wall of heterocyst in the trichome of cyanbacterium and presence of leg-haemoglobin along the periphery in the root nodules of leguminous plants.
Characteristic deficiency symptoms include purple vein disease of tomato leaves (for nitrogen), tea yellow disease (for sulphur and/or iron), tip hooking in brassicae (for calcium), die back (for potassium), chlorosis particularly in the lower/older leaves (for magnesium), grey speck of oat/barley leaves (for manganese), exanthema and reclamation disease (for copper), rosette disease white tip on maize and Khaira of paddy (for zinc), whip-tail disease of brassicae (for molybdenum), and heart not centre not of sugarbeet and hard fruit of citrus (due to boron deficiency).

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