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Friday, July 6, 2012

PowerPoint Presentation On Plants in response to stress

PPT On Plants in response to stress

Presentation Transcript:
1. Plants in response to stress

2. introduction
Stress is any change in environmental conditions. External conditions that adversely affect growth, development, or productivity. Stresses trigger a wide range of plant responses: altered gene expression cellular metabolism changes in growth rates and crop yields

3. Types of stress Biotic
- imposed by other organisms. Abiotic - arising from an excess or deficit in the physical or chemical environment. Biotic and abiotic stresses can reduce average plant productivity by 65% to 87%, depending on the crop. Resistance or sensitivity of plants to stress depends on: the species the genotype development age

4. Environmental conditions
 that can cause stress water-logging Drought high or low temperatures excessive soil salinity inadequate mineral in the soil too much or too little light

5. Stress resistance mechanisms
 Avoidance mechanisms prevents exposure to stress Tolerance mechanisms permit the plant to withstand stress Acclimation alter their physiology in response stress

6. Leucaena leucocephala
Tropical leguminous tree. Grows better in soil having basic pH . Used in wood production, soil improvement, reforestration, for fodder purposes. Tolerant to salinity and non-tolerant to water logging. Known to be significantly affected in response to external salt content( NaCl).

7. For More Info Please Refer Our PPT.
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