Plant and Soil

, Volume 253, Issue 2, pp 413–427

The interaction of phosphorus and potassium with seed alkaloid concentrations, yield and mineral content in narrow-leafed lupin (Lupinus angustifoliusL.)

  • P. Gremigni
  • J. Hamblin
  • D. Harris
  • W. A. Cowling
Article

DOI: 10.1023/A:1024828131581

Cite this article as:
Gremigni, P., Hamblin, J., Harris, D. et al. Plant and Soil (2003) 253: 413. doi:10.1023/A:1024828131581

Abstract

We tested the impact of P deficiency, K deficiency, and their interaction on seed alkaloid concentrations and profile, yield and mineral content in sweet (low-alkaloid) and bitter (high-alkaloid) varieties of narrow-leafed lupin (Lupinus angustifolius L.). P deficiency reduced seed alkaloid concentrations in sweet, but not in bitter, varieties. Under P deficiency, the alkaloid profile in harvested seed of sweet varieties mimicked that of the bitter variety Fest, with 13-hydroxylupanine dominating over lupanine. With adequate or abundant P, lupanine was the predominant alkaloid in sweet varieties. K deficiency was associated with an 8-fold increase of seed alkaloid concentrations in the sweet variety Danja (from 1000 to 8000 mg kg−1 DM), mostly due to the stimulation of lupanine production. There was a significant interaction between P and K that affected seed alkaloid concentrations in two ways: (i) the inhibitory effect of P deficiency was only apparent under K deficiency and (ii) the lowest seed alkaloid concentrations occurred with abundant K (240 mg K kg−1) and P (60 mg P kg−1). Seed yield of all varieties increased asymptotically with increasing P and reached a maximum at adequate P (30 mg P kg−1). There was no impact of K deficiency on seed yield. In sweet and bitter varieties P supply increased seed N, P and Zn concentrations, but not K. In contrast, seed K concentrations increased and P concentrations decreased with increasing K supply. These findings suggest that P fertiliser should be supplemented with K, to avoid high seed alkaloid concentrations stimulated by asymptomatic K deficiency at high P levels.

lupanine narrow-leafed lupin phosphorus P–K interaction potassium quinolizidine alkaloid 

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • P. Gremigni
    • 1
    • 2
  • J. Hamblin
    • 1
    • 3
  • D. Harris
    • 4
  • W. A. Cowling
    • 5
  1. 1.Centre for Legumes in Mediterranean AgricultureThe University of Western AustraliaCrawleyAustralia
  2. 2.CSIRO, Plant Industry, Centre for Environment and Life SciencesWembleyAustralia
  3. 3.Export Grains Centre LtdSouth PerthAustralia
  4. 4.Chemistry Centre (WA)East PerthAustralia
  5. 5.School of Plant Biology, Faculty of Natural and Agricultural SciencesThe University of Western AustraliaCrawleyAustralia

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