Genetic differences in phosphorus absorption among white clover populations
- 28 Downloads
Eight semi-natural white clover populations and two cultivars were grown in culture solutions containing 10 ppm and 0.01 ppm phosphorus (P). The rate of P uptake by the intact plants was then measured in solutions containing 10 ppm P.
Phosphorus uptake per unit root length was twice as great by plants previously grown at 0.01 ppm P than those grown at 10 ppm P. Large differences in total P uptake were found among populations regardless of the pretreatment; most of this variation was accounted for by differences in root length. Only small differences were found between populations for P uptake per unit root length, and then only after pretreatment with 10 ppm P; this variation was largely accounted for by relative growth rate and shoot %P.
Key wordsClover Phosphorus Populations Root Shoot Trifolium repens White clover
Unable to display preview. Download preview PDF.
- 1.Baligar V C and Barber S A 1979 Genotypic differences of corn for ion uptake. Agron. J. 71, 870–872.Google Scholar
- 2.Caradus J R and Dunlop J 1978 Screening white clover plants for efficient phosphorus use.In ‘Plant Nutrition 1978’. Proceedings of 8th International Colloquium on Plant Analysis and Fertilizer Problems. N Z Auckland, A R Ferguson, R L Bieleski and I B Ferguson. N.Z. DSIR Information Series No. 134, 75–82.Google Scholar
- 3.Caradus J R, Dunlop J and Williams W M 1980 Screening white clover (Trifolium repens L.) plants for different responses to phosphate. N.Z.J. Agric. Res. 23, 211–217.Google Scholar
- 4.Caradus J R and Williams W M 1981 Breeding for improved white clover production in New Zealand hill country.In ‘Plant Physiology and Herbage Production’. Proceedings of British Grassland Society Symposium, April 1981. Nottingham pp 163–169.Google Scholar
- 5.Chapin E S 1980 The mineral nutrition of wild plants. Annu. Rev. Ecol. Syst. 11, 233–260.Google Scholar
- 7.Marsh B a'B 1971 Measurement of length in random arrangement of lines. J. Appl. Ecol. 8, 265–267.Google Scholar
- 8.Nielsen N E and Barber S A 1978 Differences among genotypes of corn in the kinetics of phosphorus intake. Argon J. 70, 695–698.Google Scholar
- 9.Nye P H 1977 The rate-limiting step in plant nutrient absorption from soil. Soil Sci. 123, 292–297.Google Scholar
- 10.Nye P H and Tinker P B 1977 ‘Solute movement in the soil-root system’. Studies in Ecology. Vol. 4. Blackwell Sci. Publ.Google Scholar
- 11.White R E 1972 Studies on mineral ion absorption by plants. I. The absorption and utilization of phsophate byStylosanthes humilis, Phaseolus atropurpurea andDesmodium intortum. Plant and Soil 36, 427–447.Google Scholar
- 12.Williams R F 1948 The effect of phosphorus supply on the rates of intake of phosphorus and nitrogen and upon certain aspects of phosphorus metabolism in gramineous plants. Aust. J. Sci. Res. B1, 333–361.Google Scholar
- 13.Williams W M and Caradus J R 1979 Performance of white clover lines on New Zealand hill country. Proc. N. Z. Grassland Assoc. 40, 162–169.Google Scholar
- 14.Williams W M, Lambert M G and Caradus J R 1982 Performance of a hill country white clover selection relative to other clover cultivars in hill country. Proc. N. Z. Grassland Assoc. 42, 188–195.Google Scholar