Thermostable mutant of the starch biosynthetic enzymes

摘要

The present invention relates to novel mutant polynucleotide molecule that encodes an enzyme thermal stability was increased. These polynucleotides are expressed in a plant, the yield of plants growing in the heat stress conditions thereby increasing the. Polynucleotide molecules of the present invention encodes a soluble starch synthase corn endoderm ADP-glucose pyrophosphorylase and (AGP) the (SSS) enzyme activity. Were bred to contain a mutant polynucleotide, or it is transformed therewith, also plant tissue and plant expressing the polypeptide encoded by the polynucleotide, are also contemplated by the present invention. The present invention also relates to methods of isolating polynucleotides and polypeptides are contemplated to be within the scope of the present invention. It also provides a method for increasing the yield of the plant to grow in the heat stress conditions.