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© 1987 Oxford University Press

RESEARCH-ARTICLE

Changes in Levels and Integrity of Ribosomal RNA During Seed Maturation and Germination in Carrot (Daucus carota L.)

SHEILA THOMPSON1 3, J. A. BRYANT1 3 and P. A. BROCKLEHURST2 3

1Department of Plant Science, University College P.O. Box 78, Cardiff CF11XL, Wales, U.K.
2Institute of Horticultural Research (National Vegetable Research Station) Wellesbourne, Warwick CV35 9EF, U.K.

Correspondence to: Institute of Horticultural Research (N.V.R.S.), Wellesbourne, Warwick CV35 9EF, U.K.

Thompson, S., Bryant, J. A. and Brocklehurst, P. A. 1987. Changes in levels and integrity of ribosomal RNA during seed maturation and germination in carrot (Daucus carota L.).—J. exp. Bot. 38: 1343–1350.

Amounts and integrity (percentage of complete un-nicked molecules) of ribosomal RNA (rRNA) during germination in carrot seed lots of differing vigour and viability were examined using aqueous and formamide gel electrophoresis. In unaged seed, amounts of rRNA per seed in dry seed are not related to maturity, vigour or viability. However, rRNA in immature seed is more vulnerable to damage by ageing than rRNA in mature seed; thus, amounts of rRNA per seed in aged seed are indicators of vigour and viability. On imbibition of aged or unaged seed, more rRNA fragmentation occurs in immature seed than in mature seed, and the time at which the effects of synthesis outweigh the effects of degradation is earlier during germination in mature than in immature seed.

Key words: rRNA, seed maturation, seed germination, Daucus carota L.


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