Full TGIF Record # 31120
Item 1 of 1
Publication Type:
i
Refereed
Author(s):Meharg, A. A.; Bailey, J.; Breadmore, K.; Macnair, M. R.
Author Affiliation:Department of Biological Sciences, Hatherly Laboratories, University of Exeter, England
Title:Biomass allocation, phosphorus nutrition and vesicular-arbuscular mycorrhizal infection in clones of Yorkshire fog, Holcus lanatus L. (Poaceae) that differ in their phosphate uptake kinetics and tolerance to arsenate
Source:Plant and Soil. Vol. 160, No. 1, March 1994, p. 11-20.
# of Pages:10
Publishing Information:Dordrecht, Netherland: Martinus Nijhoff Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF00150341
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Holcus lanatus; Arbuscular mycorrhizae; Biomass; Resistance; Comparisons; Phosphorus uptake; Arsenic; Phosphates
Abstract/Contents:"Biomass and phosphorus allocation were determined in arsenate tolerant and non-tolerant clones of the grass Holcus lanatus L. in both solution culture and in soil. Arsenate is a phosphate analogue and is taken up by the phosphate uptake system. Tolerance to arsenate in this grass is achieved by suppression of arsenate (and phosphate) influx. When clones differing in their arsenate tolerance were grown in solution culture with a range of phosphate levels, a tolerant clone did not fare as well as a non-tolerant at low levels of phosphate nutrition in that it had reduced shoot biomass production, increased biomass allocation to the roots and lower shoot phosphorus concentration. At a higher level of phosphate nutrition there was little or no difference in these parameters, suggesting the differences at lower levels of phosphate nutrition were due solely to differences in the rates of phosphate accumulation. In experiments in sterile soil (potting compost) the situation was more complicated with tolerant plants having lower growth rates but higher phosphorus concentrations. The gene for arsenate tolerance is polymorhpic in arsenate uncontaminated populations. When phosphorus concentration of tolerant pheotypes was determined in one such population, again tolerants had a higher phosphorus status than non-tolerants. Tolerants also had higher rates of vesicular-arbuscular mycorrhizal (VAM) infection. The ecological implications of these results are that it appears that suppression of the high affinity uptake system, is at least in part, compensated by increased mycorrhizal infection."
Language:English
References:23
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Meharg, A. A., J. Bailey, K. Breadmore, and M. R. Macnair. 1994. Biomass allocation, phosphorus nutrition and vesicular-arbuscular mycorrhizal infection in clones of Yorkshire fog, Holcus lanatus L. (Poaceae) that differ in their phosphate uptake kinetics and tolerance to arsenate. Plant Soil. 160(1):p. 11-20.
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