Plant growth, phosphorus nutrition, and root morphological responses to arbuscular mycorrhizas, phosphorus fertilization, and intraspecific density

M. S. Schroeder, David Janos

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

We examined the effects of arbuscular mycorrhizas (AM), phosphorus fertilization, intraspecific density, and their interaction, on the growth, phosphorus uptake, and root morphology of three facultative mycotrophic crops (Capsicum annuum, Zea mays, and Cucurbita pepo). Plants were grown in pots with or without AM at three densities and four phosphorus availabilities for 10 weeks. AM colonization, plant weight, and shoot phosphorus concentration were measured at harvest. Root morphology was assessed for C. annuum and Z. mays. Phosphorus fertilization reduced but did not eliminate AM colonization of all species. AM, phosphorus, and density interacted significantly to modify growth of C. annuum and C. pepo such that increased density and phosphorus diminished beneficial effects of AM. Increased density reduced positive effects of AM on C. annuum and C. pepo shoot phosphorus concentrations. AM altered both Z. mays and C. annuum root morphology in ways that complemented potential phosphorus uptake by mycorrhizas, but increased density and phosphorus diminished these effects. We infer that increased density predominantly influenced plant responses by affecting whether or not carbon (photosynthate) or phosphorus limited plant growth. By exacerbating carbon limitation, high density reduced the benefit/cost ratio of mycorrhizas and minimized their effects.

Original languageEnglish
Pages (from-to)203-216
Number of pages14
JournalMycorrhiza
Volume15
Issue number3
DOIs
StatePublished - May 1 2005

Fingerprint

vesicular arbuscular mycorrhizae
Fertilization
Phosphorus
nutrition
plant growth
phosphorus
Capsicum
Growth
Capsicum annuum
Cucurbita pepo
Zea mays
mycorrhizae
Carbon
colonization
shoot
Plant Shoots
uptake mechanisms
Cucurbita
shoots
carbon

Keywords

  • Facultative mycotrophs
  • Intraspecific competition
  • Phosphorus-immobilizing soil
  • Row crops
  • Specific root length

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Plant Science

Cite this

Plant growth, phosphorus nutrition, and root morphological responses to arbuscular mycorrhizas, phosphorus fertilization, and intraspecific density. / Schroeder, M. S.; Janos, David.

In: Mycorrhiza, Vol. 15, No. 3, 01.05.2005, p. 203-216.

Research output: Contribution to journalArticle

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