Analysis of Glucose Metabolism in the Heterotic Viability in Seedling Growth of Maize F1 Hybrid

Japanese Journal of Crop Science

Masanobu MINO¹  Masayoshi INOUE¹ 

关键词: F1 hybrid;    F1雑種;    Germination;    グルコース代謝;    Glucose metabolism;    雑種強勢;    Hybrid vigor;    トウモロコシ;    Maize;    発芽;    Seedling growth;    芽生えの生長;   

DOI  :  10.1626/jcs.63.682

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We have analyzed seedling growth of maize F1 hybrids, CO2 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 F1 hybrid (Oh545×W22) germinates and grows faster than parental inbred lines. The evolution rate of CO2 from germinating kernels was also higher in the heterotic F1 hybrid. However, these trend were not seen in the non-heterotic F1 hybrid (Oh545×Oh45). Glucose metabolism in the embryonic cells was evaluated by in vivo labelling of CO2 and cellular components with [U-14C] glucose. In the heterotic F1 hybrid, the assimilation rate of radioactivities from [U-14C] glucose into amino acids, proteins, nucleic acids, organic acids and CO2 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 F1 hybrid genotype, and is one of the key factors in the mechanism by which the heterotic F1 hybrid expresses its hybrid vigor in the germinating process.

【 授权许可】

Unknown