Effects of rhizobacteria on the respiration and growth of Cerasus sachalinensis Kom. seedlings

Abstract

In this study, we investigated the influence of rhizosphere microorganisms on seed germination and root metabolism in Cerasus sachalinensis Kom. We inoculated C. sachalinensis plants with suspensions of dominant bacterial strains isolated from their rhizosphere. Four bacterial strains each with significant growth-promoting or growth-inhibiting effects were screened from the efficient root-colonizing microorganisms. The number of actinomycetes increased and that of fungi decreased significantly in the seedling rhizospheres after rhizobacteria treatment. The growth-promoting bacteria slightly affected the respiration rates and respiratory pathway enzymes, but significantly improved root viability, root carbohydrate concentration and seedling growth. Bacillus cereus, Staphylococcus sp. and Pseudomonas fluorescens were identified as the growth-promoting rhizobacteria; one strain could not be identified. After inoculation with the growth-inhibiting bacteria, the number of fungal colonies in the seedling rhizospheres increased and root viability and respiration rate as well as starch and sucrose accumulation in the roots significantly decreased. The glycolysis, pentose phosphate and alternative oxidase pathways became the major pathways of respiratory metabolism after inoculation with the growth-inhibiting bacteria. The height, leaf number, growth and dry weight of the seedlings decreased significantly in plants inoculated with the growth-inhibiting bacteria. Inoculation of C. sachalinensis rhizosphere with growth-promoting and growth-inhibiting bacteria affected the soil environmental factors such as microbial group composition, nutrient concentration and seedling biomass.

PGPR Reduce Root Respiration and Oxidative Stress Enhancing Spartina maritima Root Growth and Heavy Metal Rhizoaccumulation

“…Continuing our focus on symbiotic relations, bacteria may also influence root respiration rate by the release of some compounds to the rhizosphere ( Adesemoye and Egamberdieva, 2013 ). In this sense, some authors measured root respiration for bacterial inoculation, generally showing an increased root respiration rate ( Hadas and Okon, 1987 ; Phillips et al, 1999 ; Zhou et al, 2015 ; Qin et al, 2016 ). However, the effect of rhizobacterial bioaugmentation in roots has not been tested considering the electron partitioning between the COX and AOX pathways, much less under heavy metal stress.…”

Identification of Root-Associated Bacteria That Influence Plant Physiology, Increase Seed Germination, or Promote Growth of the Christmas Tree Species Abies nordmanniana

“…Hence, these results document the ability of Paenibacillus strain s37 to enhance the concentrations of both free and storage carbohydrates and affect their allocation in the different plant tissues. Other bacterial inoculants have been reported to increase affect plant carbohydrate levels ( Marcos et al, 2016 ; Qin et al, 2016 ) but the mechanism behind the effect of bacterial inoculations on the concentrations of plant carbohydrates is still poorly understood ( Magel et al, 2000 ; Gagné-Bourque et al, 2016 ). In consequence, there is a need to implement physiological phenotyping into a holistic phenomics approach ( Großkinsky et al, 2015 , 2018 ) to clarify how bacterial inoculation affects the regulation of carbohydrate metabolism in A. nordmanniana.…”

Long-term maize stalk retention reduces seedtime soil respiration

“…For instance, stalk retention changes soil temperature, soil moisture, and soil nutrient status, especially in the tillage layer (Koiter and Lobb, 2008). Inversely, these soil property changes affect Rs (Isla et al, 2016;Qin et al, 2016). Diverse soil temperature experimental results have indicated that the Rs rate is closely related to soil temperature.…”