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ACTIVATION OF NATURAL HOST DEFENCE BY ELICITORS FOR MANAGEMENT OF
POST HARVEST DISEASES
Doctoral Seminar IVINOD UPADHYAY
ID.NO- 440561
India's post-harvest losses over Rs 2 L cr annually: Assocham
30% of Fruits and vegetables - unfit for consumption due to spoilage after harvesting
West Bengal(Rs 13,600 crore anually) >Gujarat (Rs 11,400 crore)> Rs (10,700 crore) >Uttar Pradesh(Rs 10,300 crore)>Maharashtra (Rs 10,100 crore)
Additional requirement of cold storage - 370 lakh tons for fruits and vegetables. Presently- total storage capacity for 300 lakh tons.
Total postharvest food loss -10-40% (FAO, 2010)
Highlights !!
2
Losses would be enough to feed around 70–100 million people, i.e.
approximately a third of India’s poor (ICAR, 2010)
Loss of overall Resources….seed, labor, water..etc.
Food Security and Postharvest Loss
3
INTRODUCTION
Compounds stimulating any type of plant defense
Biotic or abiotic origin
Production of ROS (reactive oxygen species)
Hypersensitive response
Production of phytoalexins, i.e. antimicrobial secondary compounds
ELICITOR
Induction of plant defense
Elicitors may induce local acquired resistance (LAR), systemic acquired resistance (SAR) or induced systemic resistance (ISR)
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CLASSIFICATION OF ELICITORS
PHYSICAL•Radiation•Heat
treatment
CHEMICAL•Acibenzolar•Chitosan•Salicylic acid•Jasmonic acid•Methyl jasmonate•Harpin•Oligandrin•Benzothiadiazole
BIOLOGICAL•Penicillium funiculosum•Glomerella cingulata •Candida oleophila •Aureobasidium pullulans•Phyllosticta musarum •Colletotrichum magna
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EXAMPLES OF CHEMICAL ELICITORS TO NATURAL DISEASE RESISTANCE TO POST HARVEST DISEASES
Terry et al.,2003 6
Effect of application of different elicitors on polyphenol content and activity of polyphenol related enzymes
Garsia et al.,2013 7
Effect of application of different elicitors on polyphenol content and activity of polyphenol related enzymes
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MECHANISM OF ELICITATION
Bubulya, 20129
NDR declines: Results in activation of quiescent infections
Factors affecting decline of NDR in produce after harvest :
(1) Nutritional requirements for the pathogen
(2) Preformed antifungal compounds (phytoanticipins)
(3) Potential for inducible antifungal compounds (phytoalexins)
(4) Activation of fungal pathogenicity factorsPrusky, 1996
NATURAL DISEASE RESISTANCE (NDR) AFTER HARVEST
After harvest
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Modify the plant-pathogen interaction by resembling an
incompatible interaction with defense-related mechanisms
Mimic the action of the signaling molecules SA and JA and their
derivates
Luckey (1980) - concept of inducing NDR ‘plant hormesis’
Stimulation of a beneficial plant response by low or sub-lethal
doses of an elicitor/agent
PLANT HORMESIS
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No risk of creating resistant pathogen strains
Increase the phenolic content of fruit
Protecting plants and fruits from biotic and abiotic stresses
No impact on environment
Pre harvest spray can also control postharvest losses
WHY TO FOCUS ON ELICITORS ?????
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SIGNAL TRANSDUCTION PATHWAY FOR CHEMICAL ELICITORS
Chan, 2013 13
APPROACHES TO CONTROL POST HARVEST DECAY AND MECHANISM INVOLVED BASED ON PROTEOMIC STUDY
Chan, 2013 14
ELICITORS OF BIOLOGICAL ORIGIN
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HARPIN INDUCED RESISTANCE TO BLUE MOLD OF APPLES
Control
Treated Capdeville et al., 2008
Flocculent material 17
Control
Treated
WALL APPOSITION AND CONDENSED TANNIN VACUOLES IN HARPIN TREATED APPLES
Capdeville et al., 2008 1
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HARPIN TREATED BEFORE HARVEST HARPIN TREATED AFTER HARVEST
120 days at 0.5°C plus 7 days at 20°C
120 days at 0.5°C D
isea
se
frui
t %
104spores/ml
103spores/ml
Capdeville et al., 2003
Dis
ease
fr
uit
%Varie
ties
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EFFECTS OF OLIGANDRIN ON DISEASE CAUSED BY B. cinerea IN TOMATO FRUIT
Wang et al.,2011
At 25ºC
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CHANGES IN DEFENCE RELATED ENZYMATIC ACTIVITIES IN TOMATO FRUIT
Incubated at 25°C85 to 95% RH Wang et al.,2011
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DEFENSE GENE EXPRESSION IN TOMATO FRUITS INDUCED BY OLIGANDRIN
Wang et al.,2011 23
SYNTHETIC CHEMICAL ELICITORS
ASM24
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EFFECTS OF BENZOTHIADIAZOLE AND METHYL JASMONATE ON BANANAS INOCULATED WITH Colletotrichum musae
Cheng Ma et al.,2009
BTH- 5 mmol/LMeJA - 0.1 mmol /LAt 22ºC
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EFFECTS OF BENZOTHIADIAZOLE ANDMETHYL JASMONATE ON CHITINASE (MaChit) GENE
EXPRESSION
Cheng Ma et al.,2009 2
7
28
Effect of BTH on lesion area and disease incidence in peach fruit inoculated with P. expansum
Liu et al.,2004 29
Effect of the BTH on activities of different enzymes in peach fruit
Liu et al.,2004 30
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PREHARVEST SPRAY AND POSTHARVEST MANAGEMENT
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Effects of pre-harvest ASM spray in Yali pear fruit inoculated with P. expansum or A. alternata after harvest
P. expansum
A. alternata
Cao et al.,200633
Effects of pre-harvest ASM spray on the activities of defence related enzymes in Yali pear fruit after harvest
Cao et al.,2006 34
Cao et al.,2006
Effect of pre-harvest spray of ASM on activities of different enzymes in young harvested pear fruit
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Effects of the Salicylic acid sprays in pear fruit inoculated with P. expansum after harvest
Cao et al.,2006 37
EFFECTS OF THE SALICYLIC ACID SPRAY ON ACTIVITIES OF DEFENSE RELATED ENZYMES IN THE YOUNG PEAR FRUIT.
Cao et al.,2006 38
Effect of the SA spray on activities of different enzymes in the young pear fruit
Cao et al.,2006 39
COMPATIBILITY WITH BIOCONTROL AGENTS
40
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Compatibility of methyl jasmonates with antagonisticyeast Cryptococcus laurentii
Yao et al.,2004
25ºC 0ºC
Me Ja conc.0µmol/l50µmol/l100µmol/l200µmol/l400µmol/l
42
Effect of Monilinia fructicola and Penicillium expansum in peach fruit treated with MeJA and Cryptococcus
laurentii
Yao et al.,2004
CK-Wounding + pathogenA- MeJA + pathogen B- C. laurentii + pathogen(less cfu)C- MeJA +C.laurentii+ pathogenD- C. laurentii + pathogen(high cfu)
M. fructicola P. expansum 43
Effect of MeJA and Cryptococcus laurentii on defense related enzymes in peach fruit
Yao et al.,200425ºC 0ºC 4
4
Effect of MeJA and Cryptococcus laurentii on PAL AND POD activity in peach fruit
Yao et al.,200425ºC 0ºC 4
5
46
COMPARATIVE EFFECTIVENESS OF DIFFERENT ELICITORS
47
Comparative effects of different elicitors on management of Alternaria rot in pear
Tian et al., 2006
A - Salicylic acid B - oxalic acid C- calcium chloride D - antagonistic yeast E- untreated control 4
8
Comparative effects of different elicitors on defense related enzymes in pear
Tian et al., 2006 49
FACTORS INFLUENCING THE EXPRESSION OF INDUCED RESISTANCE
GENOTYPE
ENVIRONMENT
OTHER FACTORS
50
Walters et al.,2005
GENOTYPE:
Hijwegen and Verhaar (1994) - Resistance in cucumber to the
powdery mildew fungus induced by treatment with INA was cultivar
dependent
Highest levels of induced resistance expressed in a partially resistant
cultivar
much lower levels of resistance in susceptible cultivars
Dann et al.(1998) - Resistance to Sclerotinia sclerotiorum induced by
treatment with INA or ASM in soybean was greatest in susceptible
cultivars
Oostendorp et al. (2001)- Resistance activated by ASM in monocots
are very long lasting compare to dicots
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Heil et al.(2000) - ASM applied to wheat in the absence of pathogen
Reduced biomass
Reduced numbers of ears and grains
When nitrogen supply was limited effects was pronounced
Reductions in the expression of genes related to primary metabolism
following elicitation of resistance.
Dietrich et al. (2005)- Treated Arabidopsis plants with ASM -initial growth
reductions was compensated subsequently by increasing growth rates
ENVIRONMENTCOST OF INDUCED RESISTANCE
52
Effect of resistance induction on seed production was determined by
environmental conditions such as nitrogen supply, water stress, and
competition with other plants.
Result - costs, no costs, or even higher seed production by ASM-induced
compared with uninduced controls under different combinations of
environmental factors.
Induced plants were most likely to incur fitness costs if grown in a
competitive environment.
Dietrich et al.(2005)
53
Should a resistance elicitor be applied before or after a fungicide
application????
Depend upon the particular pathogen or pathogens being targeted and the stage
of crop growth
OTHER FACTORS
Eg. Strobilurin fungicide + ASM - effective in controlling Albugo
occidentalis and increasing leaf quality in spinach
ASM + mancozeb- provide protection against Claviceps africana on sorghum in case where fungal isolates resistant to the usual fungicide treatment -triadimenol
Timing of application and frequency of application
Conjunction with appropriate-dose fungicides
COMBINATIONS
54
QUESTION NEED TO BE ANSWERED
Will incorporation of induced resistance into disease control programs
be more expensive than current approaches?
Will induced resistance represent a sustainable approach to disease
control???
Farmers and growers need to be convinced….
Whether it can replace the existing management practices????
Will it be feasible with other practice in integrated disease management?????
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