Phosphorus Stress Induced Variations in Growth Behavior and P Efficiency among Brassica Cultivars Grown with Sparingly Soluble P Sources

M. Shahbaz Akhtar, Yoko Oki, Makoto Nishigaki, Tadashi Adachi, Yoshitaka Nakashima, Yuki Nakamoto, Claudia Hartwig

Research output: Contribution to journalArticle

Abstract

To evaluate phosphorus (P)-stress-induced relative growth responses, P-efficiency characteristics, P remobilization, and redesign in root architectural systems, Brassica cultivars were grown with sparingly soluble rock phosphate and calcium phosphate [Ca3(PO4)2] or with low/high P supply in solution and sand culture experiments. Tested cultivars showed considerable genetic diversity in biomass accumulation, concentration and contents of P, P-stress factor (PSF), and P-efficiency characteristics [P-utilization efficiency (PUE), P efficiency (PE), and P-efficiency ratio (PER)]. Statistically significant correlations were observed between P efficiency and growth parameters. Elongation rates of primary roots decreased but the length of lateral roots and branched zone elongation rates increased under P starvation. Cultivars remobilized P from metabolically inactive to active sites in P-stressed plants that may have helped low-P-tolerant cultivars to establish a better rooting system, which provided basis for enhanced P-use efficiency and tolerance against P stress. Cultivars depicting high P efficiency and low PSF values were more tolerant and are a better choice to grow under P-stress environments.

Original languageEnglish
Pages (from-to)1995-2017
Number of pages23
JournalCommunications in Soil Science and Plant Analysis
Volume45
Issue number15
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Brassica
  • P efficiency
  • P remobilization
  • P starvation
  • PSF
  • rock P
  • root anatomy

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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