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Seed Endophyte bacteria enhance drought stress tolerance in Hordeum vulgare by regulating, physiological characteristics, antioxidants and minerals uptake

文献类型： 外文期刊

作者： Abideen, Zainul 1 ; Cardinale, Massimiliano 3 ; Zulfiqar, Faisal 5 ; Koyro, Hans-Werner 2 ; Rasool, Sarwat Ghulam 1 ; Hessini, Kamel 6 ; Darbali, Walid 2 ; Zhao, Fengliang 7 ; Siddique, Kadambot H. M. 8 ;

作者机构： 1.Univ Karachi, Dr Muhammad Ajmal Khan Inst Sustainable Halophyte, Karachi, Pakistan

2.Justus Liebig Univ Giessen, Inst Plant Ecol, Res Ctr Bio Syst Land Use & Nutr IFZ, Giessen, Germany

3.Justus Liebig Univ Giessen, Inst Appl Microbiol, Res Ctr Bio Syst Land Use & Nutr IFZ, Giessen, Germany

4.Univ Salento, Dept Biol & Environm Sci & Technol DiSTeBa, Lecce, Italy

5.Islamia Univ Bahawalpur, Fac Agr & Environm, Dept Hort Sci, Bahawalpur, Pakistan

6.Taif Univ, Coll Sci, Dept Biol, Taif, Saudi Arabia

7.Chinese Acad Trop Agr Sci CATAS, Environm & Plant Protect Inst, Haikou, Peoples R China

8.Univ Western Australia, UWA Inst Agr, Perth, WA, Australia

关键词： bacterial inoculation; ecophysiology; endophyte (DSE); oxidative stress; photosynthesis

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Growth stimulating bacteria help remediate dry arid soil and plant stress. Here, Pseudomonas sp. and Pantoea sp. we used to study the stress ecology of Hordeum vulgare and the environmental impact of water deficit on soil characteristics, growth, photosynthesis apparatus, mineral acquisition and antioxidiant defense. Plants inoculated with Pseudomonas or Pantoea had significantly higher (about 2 folds) soil carbon flux (soil respiration), chlorophyll levels (18%), net photosynthetic rate (33% in Pantoea and 54% in Pseudomonas), (44%) stomatal conductance than uninoculated plants in stressed conditions. Both bacterial strains improved leaf growth (23-29%) and root development under well-watered conditions but reduced around (25%) root biomass under drought. Plants inoculated with Pseudomonas or Pantoea under drought also increased of about 27% leaf respiration and transpiration (48%) but decreased water use efficiency, photoinhibition (91%), and the risk of oxidative stress (ETR/A) (49%). Drought stress increased most of the studied antioxidant enzymatic activities in the plants inoculated with Pseudomonas or Pantoea, which reduce the membrane damage and protect plants form oxidative defenses. Drought stress increased K+ acquisition around 50% in both shoots inoculated with Pseudomonas or Pantoea relative to non-stressed plants. Plants inoculated with Pseudomonas or Pantoea increased shoot Na+ while root Na+ only increased in plants inoculated with Pseudomonas in stressed conditions. Drought stress increased shoot Mg2+ in plants inoculated with Pseudomonas or Pantoea but did not affect Ca2+ relative to non-stressed plants. Drought stress increased about 70% K+/Na+ ratio only in plants inoculated with Pseudomonas relative to non-stressed plants. Our results indicate that inoculating barley with the studied bacterial strains increases plant biomass and can therefore play a role in the environmental remediation of drylands for food production.

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