Drought stress amelioration in wheat through inoculation with Burkholderia phytofirmans strain PsJN

The aim of the present study was to promote plant growth characteristics including mineral uptake and various phytohormone production by indigenously isolated Bacillus spp. strains. Plants subjected to normal and water stress conditions were collected after 21 days to measure physiological parameters, photosynthetic pigment estimation, biochemical attributes, lipid peroxidation and antioxidant enzyme response modulation. Our results correlated with drought stress amelioration with the inoculation of Bacillus spp. strains BEB1, BEB2, BEB3 and BEB4 under sterile soil condition. Inoculated plants of both maize cultivars showed increases in fresh (56.12%) and dry (103.5%) biomass, plant length (42.48%), photosynthetic pigments (32.76%), and biochemical attributes with enhanced nutrient uptake. The overall maize antioxidant response to bacterial inoculation lowered the malonaldehyde level (59.14%), generation of hydrogen peroxide (45.75%) and accumulation of flavonoid contents in both control and water stress condition. Activity of antioxidant enzymes, catalase (62.96%), peroxidase (23.46%), ascorbate peroxidase (24.44%), and superoxide dismutase (55.69%) were also decreased with the application of bacterial treatment. Stress amelioration is dependent on a specific plant–strain interaction evident in the differences in the evaluated biochemical attributes, lipid peroxidation and antioxidant responses. Such bacteria could be used for enhancing the crop productivity and plant protection under biotic and abiotic stresses for sustainable agriculture.

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ENDOPHYTIC COLONIZATION OF BURKHOLDERIA PHYTOFIRMANS STRAIN PSJN INDUCES DROUGHT-STRESS TOLERANCE IN MAIZE

Acta Horticulturae ◽

10.17660/actahortic.2013.1009.14 ◽

2013 ◽

pp. 117-125

Author(s):

M. Naveed ◽

B. Mitter ◽

A. Sessitsch ◽

T.G. Reichenauer

Keyword(s):

Drought Stress ◽

Stress Tolerance ◽

Endophytic Colonization ◽

Drought Stress Tolerance ◽

Burkholderia Phytofirmans Strain Psjn

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Drought stress amelioration in plants using green synthesised iron oxide nanoparticles

Materials Today Proceedings ◽

10.1016/j.matpr.2020.05.801 ◽

2020 ◽

Author(s):

B. Sreelakshmi ◽

S. Induja ◽

P.P. Adarsh ◽

H.L. Rahul ◽

S.M. Arya ◽

...

Keyword(s):

Iron Oxide ◽

Drought Stress ◽

Iron Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Stress Amelioration

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Prospective evaluation of individual and consortia plant growth promoting rhizobacteria for drought stress amelioration in rice (Oryza sativa L.)

Plant and Soil ◽

10.1007/s11104-020-04730-x ◽

2020 ◽

Vol 457 (1-2) ◽

pp. 225-240

Author(s):

Bhawana Joshi ◽

Anita Chaudhary ◽

Harjodh Singh ◽

P. Anil Kumar

Keyword(s):

Oryza Sativa ◽

Drought Stress ◽

Plant Growth ◽

Oryza Sativa L ◽

Plant Growth Promoting Rhizobacteria ◽

Prospective Evaluation ◽

Stress Amelioration ◽

Plant Growth Promoting ◽

Growth Promoting

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Transpiration and Drought Stress Recovery of Three Zinnia Cultivars1

Journal of Environmental Horticulture ◽

10.24266/0738-2898-36.3.108 ◽

2018 ◽

Vol 36 (3) ◽

pp. 108-113

Author(s):

Bruce R. Roberts ◽

Chris Wolverton

Keyword(s):

Drought Stress ◽

Water Potential ◽

Dry Weight ◽

Zinnia Elegans ◽

Stress Recovery ◽

Xylem Water Potential ◽

Horticultural Crops ◽

Shoot Dry Weight ◽

Stress Amelioration ◽

Daily Transpiration

Abstract Transpiration and drought stress recovery were investigated in three container-grown zinnia cultivars [Zinnia elegans Jacq. (‘Lilliput' and ‘Thumbelina') and Z. haageana Reger (‘Persian Carpet')] by measuring daily changes in the normalized transpiration ratio (NTR) of well-watered (control), water-stressed, and water-stressed/re-watered plants. Transpiration of plants grown in gradually drying substrate did not decline until the fraction of transpirable substrate water (FTSW) reached 0.16 to 0.12. Symptoms of plant-water stress (i.e. foliar wilt) were first observed on the leaves of ‘Persian Carpet', which was also the cultivar with the highest average daily transpiration rate. By comparison, the remaining two cultivars (‘Lilliput' and ‘Thumbelina') exhibited lower average daily transpiration rates and took significantly longer to reach the same dry-down endpoint (NTR ≤0.15). Drought stress recovery was assessed by comparing xylem water potential and root and shoot dry weight in well-watered and in drought-stressed plants following a 7-day stress amelioration period. Xylem water potential of all three drought-stressed cultivars increased (i.e. became less negative) one week after re-watering. Root biomass and root:shoot ratio were both significantly greater in water-stressed plants than in well-watered plants of the same cultivar, a finding that suggests the likelihood of osmotic adjustment in response to drought. Index words: normalized transpiration ratio, fraction of transpirable substrate water, foliar wilt, containerized horticultural crops. Species used in this study: ‘Lilliput' and ‘Thumbelina' zinnia (Zinnia elegans Jacq.), ‘Persian Carpet' zinnia (Zinnia haageana Reger).

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Dry-Caribbean Bacillus spp. Strains Ameliorate Drought Stress in Maize by a Strain-Specific Antioxidant Response Modulation

Microorganisms ◽

10.3390/microorganisms8060823 ◽

2020 ◽

Vol 8 (6) ◽

pp. 823 ◽

Cited By ~ 1

Author(s):

Andres Moreno-Galván ◽

Felipe A. Romero-Perdomo ◽

German Estrada-Bonilla ◽

Carlos Henrique Salvino Gadelha Meneses ◽

Ruth R. Bonilla

Keyword(s):

Drought Stress ◽

Plant Growth ◽

Plant Height ◽

Antioxidant Response ◽

Crop Productivity ◽

Proline Accumulation ◽

Stress Amelioration ◽

Dry Biomass ◽

Bacillus Spp ◽

Biomass Plant

Drought is a global problem for crop productivity. Therefore, the objective of this research was to evaluate five dry-Caribbean Bacillus spp. strains in drought stress amelioration in maize plants. Maize seeds were single-strain inoculated and sown in pots under greenhouse conditions. After 12 days, plants were subjected to 33 days of drought conditions, i.e., 30% of soil field capacity, and then collected to measure leaf and root dry biomass, plant height, antioxidant enzymes, proline accumulation, and P+, Ca2+, and K+ uptake. Results correlated drought stress amelioration with the inoculation of Bacillus spp. strains XT13, XT38 and XT110. Inoculated plants showed increases in dry biomass, plant height, and K+ and P+ uptake. The overall maize antioxidant response to bacterial inoculation under drought stress showed dependence on proline accumulation and decreases in ascorbate peroxidase and glutathione reductase activities. Moreover, results suggest that this stress amelioration is driven by a specific plant-strain correlation observed in antioxidant response changes in inoculated plants under stress. Also, there is a complex integration of several mechanisms, including plant growth-promotion traits and nutrient uptake. Hence, the use of dry-Caribbean plant growth-promoting Bacillus strains represents an important biotechnological approach to enhance crop productivity in arid and semi-arid environments.

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Effects of Paclobutrazol and Flurprimidol on Water Stress Amelioration in Potted Red Firespike

HortTechnology ◽

10.21273/horttech.26.1.26 ◽

2016 ◽

Vol 26 (1) ◽

pp. 26-29 ◽

Cited By ~ 5

Author(s):

Amir Rezazadeh ◽

Richard L. Harkess ◽

Guihong Bi

Keyword(s):

Water Stress ◽

Drought Stress ◽

Stomatal Conductance ◽

Plant Height ◽

Plant Growth Regulator ◽

Growth Index ◽

Dry Weight ◽

Flowering Plants ◽

Stress Amelioration ◽

Delayed Flowering

This study evaluated the effects of paclobutrazol (PBZ) and flurprimidol on the morphological and physiological characteristics of potted red firespike (Odontonema strictum) under drought stress. PBZ and flurprimidol were applied as a soil drench at 0.24 mg/pot. Untreated plants acted as a control. The plants were exposed to drought stress 2 weeks after plant growth regulator (PGR) application. Another group of plants treated with PGRs was watered regularly. A reduction in plant height, plant diameter, and growth index (GI) was observed in plants treated with PGRs and drought stress 5 weeks after beginning the study. Drought stress reduced plant height by 45% compared with control. Flurprimidol under drought stress decreased plant diameter and GI by 36% and 76%, respectively, compared with the control. The least leaf area and plant dry weight were observed in plants drenched with flurprimidol and grown under drought stress. Drought stress also delayed flowering and the number of plants flowering. Plants treated with PBZ had the highest photosynthesis rate, 54% more than untreated plants under drought stress alone. The lowest stomatal conductance (gS) was measured in plants under drought stress alone or drought plus PBZ. Application of PBZ-enhanced red firespike drought tolerance reducing adverse effects of water stress on photosynthesis during the experiment.

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