Effects of PGPR Bioinoculants, Hydrogel and Biochar on Growth and Physiology of Soybean under Drought Stress

The drought ameliorative effects of poly(acrylic acid) hydrogel (HG), biochar (BC) and plant growth-promoting rhizobacteria (PGPR) were evaluated on soybean exposed to drought stress. Prior to sowing, soybean seeds were soaked for 3-4 h in the broth culture of Planomicrobium chinense (MF616408) and...

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Published in:Communications in Soil Science and Plant Analysis 2022-04, Vol.53 (7), p.826-847
Main Authors: Waqar, Aqsa, Bano, Asghari, Ajmal, Muhammad
Format: Article
Language:English
Subjects:
Acrylic acid
Antioxidants
Biochar
Catalase
Charcoal
Consortia
Drought
drought stress
Fertility
hydrogel
Hydrogels
Mercury
Mineral nutrients
Moisture content
Nutrient retention
Nutrients
PGPR
Photosynthesis
Photosynthetic pigments
Pigments
Plant bacterial diseases
Plant biomass
Plant growth
Planting
Polyacrylic acid
Pseudomonas putida
Seeds
Soil
Soil fertility
Soil improvement
Soil moisture
Soil nutrients
soybean
Soybeans
Superoxide dismutase
Water content
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Summary:The drought ameliorative effects of poly(acrylic acid) hydrogel (HG), biochar (BC) and plant growth-promoting rhizobacteria (PGPR) were evaluated on soybean exposed to drought stress. Prior to sowing, soybean seeds were soaked for 3-4 h in the broth culture of Planomicrobium chinense (MF616408) and Pseudomonas putida (KX574857), while BC (5 g/kg soil) and HG (2 g/kg soil) were mixed with autoclaved soil. Plants were well watered and grown under natural conditions for 35 d, followed by 4 d of drought exposure. While drought stress negatively impacted plant growth, effects of individual application of BC, HG and PGPR in combating the drought stress were noteworthy and a predominant increase in plant biomass by BC and plant antioxidant enzymes (superoxide dismutase (SOD) and catalase (CAT)) and elevated soil nutrients by PGPR were observed. PGPR assisted HG in retaining the soil moisture content (SMC) and further elevated the leaf relative water content (LRWC) and fresh weight (FW) root. The combined application of HG and PGPR consortium was most effective in improving photosynthetic pigments, FW shoot and soil fertility status. Likewise, the combined application of BC and PGPR had stimulatory effects on plant osmoregulants, with BC combined with Pseudomonas putida significantly improving soil nutrient retention. It is inferred that HG and BC in combination with PGPR isolates and PGPR consortium are effective drought mitigating strategies.
ISSN:0010-3624
1532-2416
1532-4133
DOI:10.1080/00103624.2022.2028818