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The deficiencies of micronutrients, not only affect growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport -
A
Ca, K, Na
B
Co, Ni, Mo
C
Mn, Co, Ca
D
Cu, Mn, Fe
Detailed Solution
Iron (Fe) is a constituent of cytochromes and ferredoxin (iron-sulphur proteins), which carry electrons in both the photosynthetic and the mitochondrial electron transport chains.
Copper (Cu) is a constituent of plastocyanin in the photosynthetic chain and of cytochrome oxidase (complex IV) in the mitochondrial chain.
Manganese (Mn) is essential for the splitting of water (photolysis) in photosystem II, which supplies electrons to the photosynthetic chain, and it activates several respiratory enzymes.
So a deficiency of Cu, Mn and Fe affects both photosynthetic and mitochondrial electron flow the most.
Ca, K and Na are not electron carriers, and Co, Ni and Mo have other roles (for example Mo in nitrogenase and nitrate reductase).
So the group is Cu, Mn, Fe.
Copper (Cu) is a constituent of plastocyanin in the photosynthetic chain and of cytochrome oxidase (complex IV) in the mitochondrial chain.
Manganese (Mn) is essential for the splitting of water (photolysis) in photosystem II, which supplies electrons to the photosynthetic chain, and it activates several respiratory enzymes.
So a deficiency of Cu, Mn and Fe affects both photosynthetic and mitochondrial electron flow the most.
Ca, K and Na are not electron carriers, and Co, Ni and Mo have other roles (for example Mo in nitrogenase and nitrate reductase).
So the group is Cu, Mn, Fe.