Role of Silicon in Alleviating Biotic and Abiotic Stresses in Plants
1. Role of Silicon in Alleviating Biotic and
Abiotic Stresses in Plants
1
Speaker : Rakesh Sharma
ID. 48030 M.Sc. Ag
Deptt. of Plant Physiology
GBPUAT,PANTNAGAR
4. Chemically active and available form of Si in soil are
•Monosilicic acid Si(OH)4
•Polysilicic acid
Concentration range between 0.1mM - 0.6mM
(Epstein, 1994)
SILICON IN SOIL
6. Concentration of Si in plants on the basis of dry weight
varies between 0.1 - 10%.
High concentration in monocot
Its level increased from –
•legumes<fruits<vegetables< grasses<grain crops
Concentration of silicon in a plant varies from organ to
organ and accumulate higher in mature leaves
9. SILICON UPTAKE
Active
Wheat
Ryegrass
Barley
Rice
Cucumber
Melon
Strawberry
Soyabean
Oats
9
Plant species which exclude silicon from uptake are tomato and
bean
Passive
Zhang et al ,2015
10. SILICON UPTAKE IN RICE
10
Fig. (a)silicon uptake via transporters in rice in the form b) transported in shoot
c)&d) bulliform cells Ma et al., 2006
11. Schematic presentation of Si transport
system in rice roots
Ma et al.,2008
Fig : The schematic representation of Si transport in rice
12. Gene controlling silicon uptake in rice
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Ma et al.,2006
Fig; Different silicon transporter isolate from plants
13.
14. Criteria:
The element is part of a molecule which is an intrinsic
component of the structure or metabolism of the plant
The plant can be so severely deficient in the element that it
exhibits abnormalities in growth, development or
reproduction, i.e. ‘performance’, compared to plants with
lower deficiency
14
Epstein, 2005
15. Fig 10. Beneficial effect of silicon in rice grown in the field. Ma et al., 2008
16. AS
BENEFICIAL
ELEMENT
Provide strength and rigidity to cell wall, improved growth, health
and productivity
Developed potency to improved drought, frost and salt stress
Decreased lodging.
Developed potential and boosting the plant's against natural
insects, pests and disease causing pathogens
18. It act as physical barrier and enhance plant
resistance to toxic elements
Reduce oxidative stress and it help in alleviating
the salt damage
Alleviate drought stress (rice) by improving
plant water status, photosynthesis and mineral
nutrient absorption
It improves the yield and quality of some crops
It help in decreasing the susceptibility to disease
and insect damage.
Zhang et al,2015
26. Neck blast disease of rice
A B
Fig:A ,showing rice grown without si
treatment infected by neck blast disease
Fig:,B showing plant resistance to neck blast
with treatment of silicon
Lawrence E. Datnoff et al, 2005
27. Grain discolouration in rice
Fig.A, Symptoms of grain discoloration on rice panicles (-Si).B, healthy
panicle grown at (+ Si) in rice plants .
28. Effect of silicon in rice seedling under abiotic stress
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Fig. Physiological, Biochemical and Anatomical effect of silicon under Abiotic stress
Zhang et al, 2015
29. Effect of silicon on heavy metal stress
Fig. 2. Schematic model of silicon interactions with arsenic and cadmium (and iron) from
the soil solid phase through to leaf epidermal cells.
Meharg et al,2015
30. Fig: Interaction between intercellular Si and heavy metals.
Silicon helps in reducing heavy metal stress in plant cell
Mohamed et al,2015
31.
32. Fig. Effect of Silicon on Photosynthesis in Rice under High-Zinc Stress
Liang et al,2014
33. Fig. Silicon enhance thickness of root epidermal cell under high cadmium stress.
EFFECT OF SILICON ON ROOT ANATOMY
Zhang et al, 2015
34. Effect of silicon on rice leaves resistance to ultraviolet -b
Fig:Without UV-B irradiation both the silicon-treated (Fig.a) and non treated
leave(Fig.b) showed no necrotic spots, after 30 h exposure to UV-B radiation,the
silicon-deficient leaves exhibited many brown spots(Fig.c),but silicon treated leaves
does not show any damage due to UV-B radiation(Fig.d).
35. Fig: Schematic mechanism of the interaction of Si treatment and salt stressed plants.
Mahbod et al,2015
SILICON OVERCOME SALT STRESS IN PLANTS
36. EFFECT OF SILICON ON
SEED GERMINATION IN
NaCl STRESS
Fig: silicon increase seed germination percentage during NaCl stress
37. Fig: Effect of silicon on different concentration in NaCl stress
38. Fig. production of reactive oxygen species and defense mechanism in chloroplasts
during Salt stress.
ROLE OF SILICON FOR MITIGATION OF OXIDATIVE STRESS
Sowbiya et al, 2014
39.
40. EFFECT OF SILICON SOLUBILIZERS ON YIELD, PEST
AND DISEASE RESISTANCE 2014
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41. Different growth attributes were recorded.
Two different form of silicon solubilizers were
applied (solid and liquid).
43. 1. Silicon application enhanced the plant growth,
quality and yield.
2. Increased plant resistance to biotic and abiotic
stress
3. Decline the rate of damage done by pathogen
and insects.
44. Conclusion
Silicon plays a vital role to induce growth, development
and high yield production in plants
Silicon induced accumulation of phenolic compounds or
phytoalexin
Silicon is effective to reduce salt, oxidative, drought and
heavy metal stresses
Deposition of silica on epidermal cells of leaves act as
mechanical barrier for insects and pathogens
Silicon uptake from lateral roots of rice plant plays a key
role in rice resistance to brown spot
Application of silicon improves seed germination
44
Editor's Notes
Plant species which exclude silicon from uptake are tomato and bean.