Methods for increasing grain yield

Compositions and methods for increasing heat resistance or starch biosynthesis in plants are provided herein. Polynucleotides, polypeptides, and expression constructs for expressing mutant AGPase subunit proteins, plants comprising the polynucleotides, polypeptides or expression constructs, and methods of producing transgenic plants are also provided. 本文提供了用于提高植物的耐热性或淀粉生物合成的组合物和方法。还提供了用于表达突变AGP酶亚基蛋白的多核苷酸、多肽和表达构建体，包含所述多核苷酸、多肽或表达构建体的植物，以及产生转基因植物的方法。