Amino acid changes in the development of rice hybrids and parent
1989
Wu, W. | Xiao, Y. (Wuhan Univ., Wuhan (China). Biology Dept.)
The content of the 16 amino acids in the seeds, leaves, and anthers of four hybrid rices (Wei-You 6, Wei You 64, Shan-You 6, and Shan-You 8) were determined using automatic amino acid analyzer. In seeds, the content of six essential amino acids (lysine, valine, leucine, isoleusine, tryptophan, and phenylalanine) of the four hybrids is greatly affected by the female parent. This is significant in selecting and breeding for new hybrids with high essential amino acid contents. The amino acid contents of leaves of Wei-You 6, Shan-You 6, and Shan-You 8 are higher at the vegetative stage than at the seedling and tillering stages, indicating heterosis. By contrast, the higher amino acid content of Wei-You 64 occurs during reproductive growth, not during vegetative growth. Differences between Wei-You 64 and the other three hybrids show that hybrids have different developmental models. The increase in amino acid content of the steriles in leaves during the differentiation of young panicle shows that male abortion of the steriles occurs not only in the anthers, but in the amino acid metabolism of leaves, and that the steriles display abortion during the differentiation of young panicles. In anthers, the asparagine content in the steriles is apparently high, and the contents of alanine, valine, phenylalanine, glutamine, leucine, lysine, asparagine, and arginine in the restorer and the sterile show changes opposite to those in the four hybrid combinations.
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