Summary
Quantitative effects of inbreeding depression and heterosis in rye have been analysed at three levels of organisation: (i) the plant, (ii) the cell and (iii) the nucleus.
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i)
Hybrid plants have a higher mean fresh weight than the inbred lines over die first few weeks of growth. This is accounted for by a faster rate of growth and also by some initial advantages in seed weight.
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ii)
There is a difference in the cellular organisation of root meristems. Hybrids have almost twice as many cells per unit fresh weight as inbred lines.
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iii)
At the nuclear level, in root meristem nuclei, hybrids have greater amounts of total protein and RNA and smaller amounts of histone than do the inbred lines.
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Kirk, D., Jones, R. Quantitative nuclear variation in inbred lines and hybrid rye. Heredity 32, 357–373 (1974). https://doi.org/10.1038/hdy.1974.44
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DOI: https://doi.org/10.1038/hdy.1974.44
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