Effects of Humic Substances on the Growth of 2,4-D and Wheat Plants Inoculated with This Strain

Overview

Journal Microorganisms

Specialty Microbiology

Date 2022 May 28

PMID 35630508

Authors

Arina Feoktistova

Margarita Bakaeva

Maxim Timergalin

Darya Chetverikova

Aliya Kendjieva

Timur Rameev

Gaisar Hkudaygulov

Aleksey Nazarov

Guzel Kudoyarova

Sergey Chetverikov

Affiliations

Soon will be listed here.

Abstract

Both rhizosphere bacteria and humic substances (HSs) can promote plant growth when applied individually and even greater effects of their combination have been demonstrated. We aimed to elucidate the relative importance of the stimulating effects of HSs on bacterial growth and the effects of the combination of bacteria and HSs on plants themselves. The effects of humic (HA) and fulvic acids (FA) (components of humic substances) on the growth of 2,4-D in vitro were studied. We also studied the effects of this bacterial strain and HSs applied individually or in combination on the growth of wheat plants. Although the 2,4-D strain showed low ability to use HSs as the sole source of nutrition, the bacterial growth rate was increased by FA and HA, when other nutrients were available. HSs increased root colonization with bacteria, the effect being greater in the case of HA. The effects on roots and shoots increased when bacteria were associated with HSs. FA+ 2,4-D was more effective in stimulating shoot growth, while HA + 2,4-D was in the case of root growth. The latter effect is likely to be beneficial under edaphic stresses.

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