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use of alternate metabolic pathwaysplants surviving under water-logged conditions offer the simplest example of such a response the submerged parts
long-term responses - behaviour of plantsplants alter their course of development to suit the prevailing environmental conditions for example leaf
quick transient responses - behaviour of plantssuch responses are stimulated by factors showing significant variations over relatively small time
morphological changesaquatic plants produce different kinds of leaves and produce aerenchyma tissues with air gaps where there be a need to do so
quantitative changesthe quantitative changes in the availability of the active biomolecules occur in order to compensate for the loss of efficiency
qualitative changesthe qualitative changes in the structure of proteins in response to stress can lead to the following resistance against
changes in the conformation of molecules - qualitative changesyou may recall that linear chain of amino acids of a protein folds into a
ways to adapt to stressnow that you know the nature of stress let us see what type of strategies plants have acquired to adapt to stress you know
symbiotic interaction - biological stresspresence of symbiotic microorganism can result in differential growth stimulation of those plants which can
parasites - biological stressmany insects and microorganisms can feed upon tissues and saps of living plants hence plants must be protected against
population density - biological stressyou are aware of what might follow an uncontrolled growth of human population there will be competition for
biological stresssince in nature the various organisms do not live in complete isolation from others stress to a plant species might also be caused
chemical stress - atmospheric imbalancesat least two components of the environment oxygen and carbon dioxide that plants require are predominantly in
chemical stress - mineral compositionthe living systems make use of several mineral ions that they might have encountered at the very origin or
chemical stress - nature of the solutesthe acidic or basic reaction of soil and water of a particular habitat reflects its geochemical history
chemical stresssurvival of cells is dependent on carrying out of a set of chemical reactions metabolic reactions in a particular order this results
photosynthetically active radiationthis is usually in direct proportion with the incident solar radiation you know that tropic are probably the best
osmotic strength of the fluids in immediate surroundingthe availability of soluble mineral salts varies widely from habitat to habitat in fact a big
physical stress - temperaturewe are most familiar with the plants and other organisms that live at temperatures close to the temperature range in
stress - responses of plants to stresslet us recall what happens within the natural communities occupying the same habitat the relative location of
responses of plants to stressyou know that certain plant species can grow in severe environmental extremes for example plants grow below 0degc in the
biochemical changes associated with senescencewhen senescence begins many physiological and biochemical changes take place for example one of the
regulation of senescencesenescence is a part of a developmental sequence of events and has to be a controlled process you must have seen that if you
progressive senescence - senescencethis is the third category of senescence here also the leaves are shed but it is gradual senescence of leaves up
deciduous senescence - senescenceonly the leaves senesce as in many trees the senescence of leaves or abscission occurs when at the base of a leaf a