role of sulfur in plants
TRANSCRIPT
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ROLE OF SULFUR IN PLANTS
NAME: MOHD SALEEMROLL NO: 14BTM28ENROL NO: GI3742CLASS: MSc. FINAL
MOHD SALEEMMSc Botany
Advanced plant physiology
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Contents sulfur general properties Sulfur cycle Source and available form Sulfur assimilation Role of sulfur Physiological role Catalytic role Role in stress Deficiency symptoms Toxicity symptoms
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General Introduction Of Sulfur Origin of the name Latin word “sulfurium’’
meaning Sulfur Phase Solid.
Group, Period and Block 16, III, P
Atomic number 16
Relative atomic mass 32.066
Melting Point 115.21oC
Boiling Point 444.6 oC
Concentration in plants 0.05 – 1.5%
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Source and available form of sulfur Occurs in both organic and inorganic forms. In soil S mainly occurs in minerals – pyrite,
cobaltite, gypsum, epsomite and in soluble form as sulfate.
Gaseous form of S : Sulfur oxides and hydrogen sulfide.
Mainly S is taken in the form of divalent anion sulfate (SO4
2-). Through biological oxidation organic S is made
available to plants. Sulfate ions are reduced to sulphydryl group (-SH)
in plants.
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Sulfur Assimilation
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Sites of S assimilation in a cell
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Physiological role of Sulfur4th essential macronutrient after N, P &K. Group1
It is a constituent of :-
• Amino acids- Cysteine, Cystine and Methionine.• Ferrodoxin.• Volatile oils- Isothiocyanates and thiocyanates.• S-adenosyl methionine (SAM).• Sulfolipids.• Vitamins- Thiamine, biotin and lipoic acid and
coenzyme A.• Glutathione - GSH
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Catalytic role of Sulfur Thiamine- TPP, lipoic acid and Co-A Pyruvate dehydrogenase complex enzyme(PDH)Oxoglutarate dehydrogenase etc.
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Continued…..• BiotinPyruvate carboxylase Acetyl CoA carboxylase
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Role of Sulfur in stressBoth abiotic and biotic stresses
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S-assimilation linked with antioxidant system under stress condition
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Deficiency symptoms of Sulfur
Immobile Chlorosis in leaves – tea yellow diseaseLeaf tips and leaf margins roll inwardProtein synthesis – reducedInhibits nodule formationChlorophyll - protein complexes impaired
synthesisStem – hard
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Deficiency symptoms
corn Tabacco
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Stages of sulfur deficiency in Cannabis
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Toxicity symptoms• Rare• Reduced leaf size and overall growth• Yellowing of leaf or scorched at edges• Induces deficiency to other nutrients by competition
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