To study the effect of different temperature and photoperiod regimes on tocopherol content, seventeen photo and thermo tolerant soybean genotypes were planted under three planting dates viz., March 1(D1), June 5 (D2) and August 7 (D3). Analysis of variance revealed significant differences for genotypes, environments and genotype x environment interaction for tocopherol content. It was highest (average of 850 ppm with range of 588-1255 ppm) in case of June sowing where grain filling stage was exposed to moderate temperature and photoperiod conditions. Exposure of seed filling stage to high (March sowing) or low (August sowing) temperatures and photoperiods reduced tocopherol concentrations. Correlation analysis revealed that tocopherol content was significantly and negatively correlated with oil content in March and August sowings. Identification of genotypes having high tocopherol in each sowing signified the role of genetic background along with role of growing environment in tocopherol synthesis.

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