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Accumulation of choline and glycinebetaine and drought stress tolerance induced in maize (Zea mays) by three plant growth promoting rhizobacteria (PGPR) strains.
Author(s):
1. Wei Gou: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China ;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
2. Li Tian: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
3. Zhi Ruan: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
4. Peng Zheng: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
5. Fucai Chen: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
6. Ling Zhang: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
7. Zhiyan Cui: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
8. Pufan Zheng: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
9. Zheng Li: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
10. Mei Gao: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
11. Wei Shi: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
12. Lixin Zhang: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China ;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
13. Jianchao Liu: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
14. Jingjiang Hu: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation and College of Life Sciences, Northwest A&F University, Yangling 712100, P. R. China
Abstract:
The role of plant growth promoting rhizobacteria (PGPR) in inducing the tolerance of crop plants to drought is vital in regulation of physiological reactions that eventually adapts to a stressed environment, however, how PGPR strain induces better drought resistance by accumulation of choline and glycinebetaine (GB) in maize under drought stress (DS) is still poorly understood. A pot experiment was carried out to evaluate the induced role in maize by the three PGPR strains i.e. Klebsiella  variicola F2 (KJ465989), Raoultella planticola YL2 (KJ465991) and Pseudomonas fluorescens YX2 (KJ465990) in view of plant growth, water relations and accumulation of choline and GB in leaves. Seedlings of cultivar Zhengdan 958 were inoculated with strains F2, YL2 and YX2 under different DS degrees induced by different PEG-6000 concentrations of 0, 10%, 15% and 20%. The soil microbe strains F2, YL2 and YX2 substantially enhanced the accumulation of choline and GB, and in turn improved leaf relative water content (RWC) and dry mater weight (DMW) under varying DS regimes. The best responses induced by PGPR were obtained by strain YX2 regardless of DS degree and all three strains under moderate DS stimulated by 10-15% concentrations of PEG-6000. The PGPR strains were involved in the regulation of osmotic adjustment via accumulations of choline and subsequent GB, resulting in improvement of water relations and plant growth in maize plants under DS. The effects of PGPR strains on improvement of plant drought resistance might be dependent on microbial species and degree of DS.
Page(s): 581-586
DOI: DOI not available
Published: Journal: Pakistan Journal of Botany, Volume: 47, Issue: 2, Year: 2015
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