allelopathy ppt. edited
DESCRIPTION
Plant PhysiologyTRANSCRIPT
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ALLELOPATHY ABDON, Demiel Kaye BAUTISTA, Laiza MELEGRITO, Jodelyn MONTALLA, Venus TAROMA, Neil
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ALLELOPATHY
v refers to beneficial or harmful effects of one plant to another plant by release of chemicals from plant parts via:
-leaching -root exudation -volatilization -residue decomposition -other processes in both natural and agricultural systems
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• Common effect: reduced seed germination & seedling growth
• Allelopathic compounds may have originally evolved as compounds that deter pathogens or herbivores
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ALLELOPATHIC COMPOUNDS v Like other herbicides, action of most allelopathic
compounds is unknown v However, known action sites of allochemicals are in:
• Cell division • Pollen germination • Nutrient uptake • Photosynthesis • Specific enzyme function
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EXAMPLES OF ALLOCHEMICALS
v mixture with other compounds may lead to enhanced allolepathic effect, than when it is alone:
• Phenolic compounds: through ion uptake or respiration • Flavonoids • Terpenoids: can inhibit cell division • Alkaloids • Steroids • Carbohydrates • Amino acids
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PLANTS PARTS HAVING ALLELOPATHIC ACTIVITY v may vary over a growing season
• Flowers • Leaves • Leaf litter • Stems • Bark • root
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ECOLOGICAL EFFECTS
v Autotoxicity -allolepathy between oraganims of the same species Ex. Trifolium spp. (clovers) and Asparagus officinalis
(asparagus) v Control of weeds in agriculture
- some genetically modified crops are allelopathic to weed, increasing the rate of production
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PLANTS EXHIBIT ALLELOPATHY
v Miracle tree • Used in india • Inhibits growth of other trees but not its own seedlings • Reduce yield of yeast but increased yield of rice
v Pine trees • Pine needle droppings causes the soil around pine
trees to be acidic
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BLACK WALNUT v Black walnut causes neighboring plants to turn yellow, wilt
and die • Hydrojuglone
-Non toxic, colorless chemical -In leaves, stems, fruit hulls, inner bark and roots, -When exposed in air and soil compounds, turns
into allochemical “juglone”
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• Juglone -Higly toxic -Exuded from all parts of the tree -Affect other plants through: Root contact Leakage or decay in the soil Falling and decaying leaves Rain -Although low water solubility, small amounts can
cause injury to sensitive plants
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CONTROL
v Soil micro organisms -Ingest juglone as energy sources and metabolic composition can turn juglone as non toxic -Well drained, aerated soils accelerate microbial activity -Urban soils on the other hand decrease microbial growth making plants in the urban area high risk for these chemicals
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v Adheres to soil rather than in plants causing favorable environment for microbial growth
v Mycorrhizal fungi -necessary for normal uptake functions -Allelochemicals can disrupt the uptake process by damaging the root hairs or by inhibiting mycorrhizal populations in the soil
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REFERENCES
• James J. Ferguson, a. (2015). HS944/HS186: Allelopathy: How Plants Suppress Other Plants. Edis.ifas.ufl.edu. Retrieved 24 November 2015, from https://edis.ifas.ufl.edu/hs186
• Appleton, B. B. (2015). The Walnut Tree: Allelopathic Effects and Tolerant Plants. Virginia Cooperative Extension.
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