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Hybrid vigor found in some characters of maize seedlings



Hybrid vigor found in some characters of maize seedlings



Japanese Journal of Breeding 30(2): 131-138



To study heterosis of maize, comparisons were made for morphological and physiological characters of germinating kernels between parental inbreds, Oh 545, W 22 and their F1 (Oh 545 .times. W 22). Protrusion of the coleorhizas and radicles, and the subsequent seedling growth of F1 kernels occurred at a faster rate than the parents without any difference in imbibition rate of kernels. Hybrid embryo contained more nonreducing and reducing sugar than the parents after 48 h of germination. Cycloheximide (5 .times. 10-5 M), an inhibitor of protein synthesis in eukaryotic cell, completely prevented the germination in all the lines with the decline of the contents of nonreducing sugar in embryo at early germination. During germination, hybrid seedlings had higher RNA content than the parents on an individual basis. Soluble protein in F1 seedling exceeded parents after 24 h. The main protein band detected at the cathode side by electrophoresis decreased faster in F1 than the parents, and this decrease was prevented by cycloheximide application. It is likely that there is some relationship between the degradation of the main protein band and the germination process.

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Accession: 000903936

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