Analysis of glucose metabolism in the heterotic viability in seedling growth of maize F-1 hybrid

Mino, M.; Inoue, M.

Japanese Journal of Crop Science 63(4): 682-688


Accession: 008154728

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We have analyzed g growth of maize F-1 hybrids, CO-2 evolution from kernels and glucose metabolism in embryonic cells during the germination process, and compared these factors with equivalent factors for their parental inbred lines. The heterotic F-1 hybrid (Oh545 times W22) germinates and grows faster than parental inbred lines. The evolution rate of CO-2 from germinating kernels was also higher in the heterotic F-1 hybrid. However, these trend were not seen in the non-heterotic F-1 hybrid (Oh545 times Oh45). Glucose metabolism in the embryonic cells was evaluated by in two labelling of CO-2 and cellular components with (U-14C) glucose. In the heterotic F-1 hybrid, the assimilation rate of radioactivities from (U-14C) glucose into amino acids, proteins, nucleic acids, organic acids and CO-2 was significantly higher than that of the parental inbred lines after 24 hrs of germination. These results show that quick activation of metabolic function in the embryo after the onset of water uptake is due to the heterotic F-1 hybrid genotype, and is one of the key factors in the mechanism by which the heterotic F-1 hybrid expresses its hybrid vigor in the germinating process.