Article thumbnail

The Frustration with Utilization: Why Have Improvements in Internal Phosphorus Utilization Efficiency in Crops Remained so Elusive?

By Terry J. Rose, Michael T. Rose, Juan Pariasca-Tanaka, Sigrid Heuer and Matthias Wissuwa

Abstract

Despite the attention internal phosphorus utilization efficiency (PUE) of crops has received in the literature, little progress in breeding crop cultivars with high PUE has been made. Surprisingly few studies have specifically investigated PUE; instead, genotypic variation for PUE has been investigated in studies that concurrently assess phosphorus acquisition efficiency (PAE). We hypothesized that genotypic differences in PAE confound PUE rankings because genotypes with higher PAE suffer a lower degree of P stress, resulting in lower PUE. The hypothesis was tested by comparing soil-based screening to a modified technique whereby rice genotypes were grown in individual containers with a single dose of solution P, to eliminate differences in P uptake among genotypes. Genotypic differences in PUE were apparent in root and shoot tissue using the modified nutrient solution technique, but PUE rankings showed no correlation with those from traditional soil-based screening. We conclude that PUE in soil-based screening systems is unavoidably linked with genotypic PAE, resulting in PUE rankings confounded by differences in P uptake. Only screening techniques assuring equal P uptake are suitable for the exploitation of genotypic variation for PUE

Topics: Plant Science
Publisher: Frontiers Research Foundation
OAI identifier: oai:pubmedcentral.nih.gov:3355673
Provided by: PubMed Central

Suggested articles

Citations

  1. (2010). Acquisition or utilisation, which is more critical for enhancing phosphorus efficiency in modern crops? Plant Sci.
  2. C.(2009).Novelapproachesinplant breeding for rhizosphere-related traits.
  3. (2005). Enhancing plant phosphorus use efficiency for sustainable cropping.
  4. (2007). Genetic and genomic approaches to develop rice germplasm for problem soils.
  5. (2002). Genotypic differences in wheat for uptakeandutilisationof Pfromiron phosphate.
  6. (2010). Genotypic variation in grain phosphorus concentration; and opportunities to improve P-use efficiency in rice. Field Crops Res.
  7. (2001). Genotypicvariationfortolerancetophosphorus deficiency in rice and the potential for its exploitation in rice improvement.
  8. (2003). How do plants achieve tolerance to phosphorus deficiency? Small causes with big effects.
  9. (2009). Identification of QTLs for phosphorus utilisation effi-ciency in maize (Zea mays L.) across P levels.
  10. (2005). Is root growth under phosphorus deficiency affected by source or sink limitations?
  11. J.,and Baligar, V.C.(1988).Ricecultivarevaluation for phosphorus use efficiency.
  12. (1998). Mapping of QTLs for phosphorus-deficiency tolerance in rice (Oryza sativa L.).
  13. (2006). Mapping QTLs for phosphorus-deficiency tolerance at wheat seedling stage.
  14. (1994). Phosphorus efficiency and the forms of soil phosphorus used by upland rice cultivars.
  15. (1988). Phosphorus efficiency in pasture species. I. Measures based on total dry weight and P content.
  16. (2011). Statement: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Received:13July2011;accepted:16October 2011; published online: 01
  17. (2011). The frustration with utilization: whyhaveimprovementsininternalphosphorus utilization efficiency in crops remained so elusive?
  18. (2010). Theoretical evidence for the functional benefit of root cortical aerenchyma in soils with low phosphorus availability.
  19. (1997). Upland rice genotypes evaluation for phosphorus use efficiency.
  20. (1998). Yield and phosphorus efficiency of some lowland rice varieties at different levels of soil-available phosphorus.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.