Abstract
The embryo and seedling growth patterns of two Triticum polyploid species, namely the tetraploid, T. durum (AABB), and the hexaploid, T. aestivum (AABBDD), were compared. Two developmental phases were identified, an initial lag phase during embryo growth and an exponential phase during seedling growth. These developmental phases were distinctly different in the two species. The initiation of mitosis prior to the inception of the exponential phase, occurred at 16 hours after imbibition in the hexaploid and 20 hours after imbibition in the tetraploid. All the growth rates of the hexaploid, except that of the shoot, showed higher activities – food reserves were mobilized much faster, root growth was faster, number of cells in mitosis over 24 hours higher: for the hexaploid primary root (7.0%) and first pair of lateral roots (6.5%), while for the tetraploid it was found to be 5.9% in the primary root and 5.7% in the first pair of lateral roots. The primary root and first pair of lateral roots of the hexaploid emerged respectively six hours and four hours earlier in comparison to those of the tetraploid. The inception time of the exponential phase in seedling growth and mobilization of food reserves were observed 12 hours earlier in the hexaploid although no differences were observed in the inception times for the shoot growth and respiration rate. It can therefore be concluded that the genomic composition of the hexaploid promotes a higher growth rate and therefore a higher metabolic rate than the tetraploid.
Similar content being viewed by others
References
Avanzi, S., A. Brunori & F. D'Amato, 1969. Sequential development of meristems in the embryo of Triticum durum. A DNA autoradiographic and cytophotometric analysis. Develop Biol 20: 368-377.
Avanzi, S.& P.L. Deri, 1969. Duration of themitotic cycle in two cultivars of Triticum durum, as measured by 3H-thymidine labelling. Caryologia 22: 187-194.
Bennett, M.D., 1971. The duration of meiosis. Proc Roy Soc Lond B 178: 277-299.
Bouaziz, A. & D.R. Hicks, 1990. Consumption of wheat seed reserves during germination and early growth as affected by soil water potential. Plant and Soil 128: 161-165.
Cavalier-Smith, T., 1985. Genetic and epigenetic control of the plant cell cycle. In: J.A. Bryant & D. Francis (Eds), The cell division cycle in plants, pp. 179-197. Cambridge University Press, London.
Dobrzanska, M., M. Tomaszewski, Z. Grzelczak, E. Rejman & J. Buchowicz, 1973. Cascade activation of genome transcription in wheat. Nature 244: 507-509.
Foard, D.E., & A.H. Haber, 1961. Anatomic studies of gammairradiated wheat growing without cell division. Amer J Bot 48: 438-446.
Greenshields, R.N., 1960. A study of the saccharides in Phaseolus vulgaresduring germination. Ph. D. University of Birmingham.
Haber, H.A.& H.J. Luippold, 1960. Effects of gibberellin on gammairradiated wheat. Amer J Bot 47: 140-144.
Hampton, J.G. 1981. The extent and significance of seed size variation in New Zealand wheats (Triticum aestivumL.). NZJ Exp Agric 9: 179-184.
Jones, R.L. & J.E. Armstrong, 1971. Evidence for osmotic regulation of hydrolic enzyme production in germinating barley seeds. Plant Physiol 48: 137-142.
Lafond, G.P. & R.J. Baker, 1986. Effects of temperature, moisture stress, and seed size on germination of nine springwheat cultivars. Crop Sci 26: 563-567.
Marcus, A., J. Feeley & T. Volcani, 1966. Protein synthesis in imbibed seeds III. Kinetics of amino acid incorporation, ribosome activation and polysome formation. Plant Physiol 41: 1167-1172.
Mory, Y.Y., D. Chen & S. Sarid, 1972. Onset of deoxyribonucleic acid synthesis in germinating wheat embryos. Plant Physiol 49: 20-23.
Pienaar, R. de V., 1955. Combinations and variations of techniques for improved chromosome studies in the Gramineae. J of SA Botany 21: 1-8.
Rogan, P.G. & E.W. Simon, 1975. Root growth and the onset of mitosis in germinating Vica faba. New Phytol 74: 273-275.
Rogers, S.O. & R.S. Quatrano, 1983. Morphological staging of wheat caryopsis development. Amer J Bot 70: 308-311.
Sears, E.R., 1952. Homologous chromosomes in Triticum aestivum. (Abst.) Genetics 37: 624.
Sears, E.R., 1966. Nullisomic-tetrasomic combination in hexaploid wheat. In: R. Riley & K.R. Lewis (Eds), Chromosome manipulations and plant genetics, pp. 29-45 Oliver & Boyd, Edinburgh.
Simon, E.W. & A. Meany, 1965. Utilization of reserves in germinating Phaseolusseeds. Plant Physiol 40: 1136-1139.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
von Well, E., Fossey, A. A comparative investigation of seed germination, metabolism and seedling growth between two polyploid Triticum species. Euphytica 101, 83–89 (1998). https://doi.org/10.1023/A:1018320230154
Issue Date:
DOI: https://doi.org/10.1023/A:1018320230154