Plants grown in greenhouse at 25 degree C when exposed first to 35 degree C for 6 hrs. and subsequently to 42 degree C for 12 hrs. adapt better to the high temperature (42 degree C) in comaprison to those direct transferred to 42 degree C for the same duration. What is the phenomenon called and what is its main phsiological basis? a. Acquired thermo- tolerance because of efficient post translational modofication of proteins b. Induced thermo- tolerance because changes in RNA polymerase II resulting in efficient and improved transcription c. Acquired thermo- tolerance because of the induction of mutagens resulting into improved stability of all the proteins d. Induced thermo-tolerance because of the induction of heat tolerance proteins Correct Answer: d. Induced thermo-tolerance because of the induction of heat tolerance proteins Explanation: A typical response to heat stress is a decrease in the synthesis of normal proteins, accompanied by an accelerated transcription and translation of new proteins called HSPs (Heat Shock Proteins) In response to sudden 5-10 degree C rises in temperature, plants produce these unique set of proteins which function to hepl cells withstand heat stress by acting as molecular chaperons which serves to attain the proper folding of misfolded proteins (due to heat shocks) and further prevent the misfolding of proteins at stressful elevated temperatures.
Posted on: Tue, 07 Oct 2014 12:00:25 +0000
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