Cryopreservation is a way to store elite quality plant germplasms. The exact mechanism of stress tolerance during cryopreservation is unknown. Unavavailability of a detailed protocol for understanding the moelcular genetics of plant cryostress is a major obstacle in plant cryobiology research. This paper describes the methods of extraction of total RNA from cryogenically stored plant tissues accompanied by successful amplication of cDNAs by reverse transcriptase PCR. The whole process can be completed in two to three days. Through this protocol, several genes were indentified which were differentially expressed during cryostress. This protocol will help researchers to pursue further research in the field of molecular genetics of plant cryostress. Interesting genes identified via these processes can be cloned and plants can be transfomred for the purpose of trait enhancement and modification
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