Education and training program in the hospital APR.pptx
Role of Sulfur in plants
1. NAME: MOHD SALEEM
ROLL NO: 14BTM28
ENROL NO: GI3742
CLASS: MSc. FINAL
MOHD SALEEM
MSc Botany
Advanced plant physiology
2. 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
3. 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%
5. 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.
8. Physiological role of Sulfur
4th 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
9. Catalytic role of Sulfur
Thiamine- TPP, lipoic acid and Co-A
Pyruvate dehydrogenase complex enzyme(PDH)
Oxoglutarate dehydrogenase etc.
17. Toxicity symptoms
• Rare
• Reduced leaf size and overall growth
• Yellowing of leaf or scorched at edges
• Induces deficiency to other nutrients by competition