Plant growth promoting rhizobacteria are more effective under drought

a meta-analysis

Rachel L. Rubin, Kees Jan van Groenigen, Bruce A Hungate

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Background and aims: Plant growth promoting rhizobacteria (PGPR) have been shown to reduce abiotic stress on plants, but these effects have not been quantitatively synthesized. We evaluated the degree to which plant growth promoting rhizobacteria (PGPR) improve plant performance with and without drought stress. Methods: We used meta-analysis to summarize 52 published articles on the effects of PGPR on root mass, shoot mass and yield under well-watered and drought conditions. We also asked whether fertilization treatments, experimental conditions, inoculum taxonomic complexity, plant functional group, or inoculum delivery method introduce variation in the effect size of PGPR. Results: Across all treatments, plants were highly responsive to PGPR; under well-watered conditions, root mass increased by 35%, shoot mass increased by 28%, and reproductive yield increased by 19%. Under drought conditions, the effect was even higher: root mass increased by 43%, shoot mass increased by 45%, and reproductive yield increased by 40%. The effect of PGPR was significantly larger under drought for shoot mass (p < 0.05) and reproductive yield (p < 0.05), but not for root mass. PGPR responsiveness also varied according to plant functional group, with C3 grass shoot production responding the least strongly to PGPR. Conclusions: We demonstrate that PGPR are highly effective for improving plant growth, with a greater effect under drought for above ground traits. While previously known for their bio-control abilities, we show that PGPR may also contribute to drought amelioration and water conservation.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalPlant and Soil
DOIs
StateAccepted/In press - Mar 12 2017

Fingerprint

plant growth-promoting rhizobacteria
meta-analysis
rhizobacterium
drought
shoots
shoot
inoculum
functional group
water conservation
abiotic stress
biological control
well
water stress
plant growth
drought stress
grasses

Keywords

  • Agriculture
  • Biofertilizer
  • Drought
  • Irrigation
  • Meta-analysis
  • PGPR
  • Plant productivity

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

Cite this

Plant growth promoting rhizobacteria are more effective under drought : a meta-analysis. / Rubin, Rachel L.; van Groenigen, Kees Jan; Hungate, Bruce A.

In: Plant and Soil, 12.03.2017, p. 1-15.

Research output: Contribution to journalArticle

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