Soluble starch synthetase activity and reducing environment of the synthetic component of the grain have been suggested for providing tolerance to post anthesis high temperature stress. There is no information regarding the role of structural component grain in the mechanism of providing temperature tolerance. Refutation of respired CO2 by green pericarp and remobilisation of carbon back to endosperm by seed coat amylase activity are the possible traits. It is suggested that this mechanism might be contributing in sustaining the grain weight under high temperature in tolerant wheat genotype.
