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Int. J. Mol. Sci. 2017, 18(12), 2651; doi:10.3390/ijms18122651

Synergistic Effects of Bacillus amyloliquefaciens (GB03) and Water Retaining Agent on Drought Tolerance of Perennial Ryegrass

1
State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
2
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA
3
College of Life Science and Technology, Gansu Agricultural University, Lanzhou 730070, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 11 October 2017 / Revised: 30 November 2017 / Accepted: 4 December 2017 / Published: 11 December 2017
(This article belongs to the Special Issue Plant Microbe Interaction 2017)
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Abstract

Water retaining agent (WRA) is widely used for soil erosion control and agricultural water saving. Here, we evaluated the effects of the combination of beneficial soil bacterium Bacillus amyloliquefaciens strain GB03 and WRA (the compound is super absorbent hydrogels) on drought tolerance of perennial ryegrass (Lolium perenne L.). Seedlings were subjected to natural drought for maximum 20 days by stopping watering and then rewatered for seven days. Plant survival rate, biomass, photosynthesis, water status and leaf cell membrane integrity were measured. The results showed that under severe drought stress (20-day natural drought), compared to control, GB03, WRA and GB03+WRA all significantly improved shoot fresh weight, dry weight, relative water content (RWC) and chlorophyll content and decreased leaf relative electric conductivity (REC) and leaf malondialdehyde (MDA) content; GB03+WRA significantly enhanced chlorophyll content compared to control and other two treatments. Seven days after rewatering, GB03, WRA and GB03+WRA all significantly enhanced plant survival rate, biomass, RWC and maintained chlorophyll content compared to control; GB03+WRA significantly enhanced plant survival rate, biomass and chlorophyll content compared to control and other two treatments. The results established that GB03 together with water retaining agent promotes ryegrass growth under drought conditions by improving survival rate and maintaining chlorophyll content. View Full-Text
Keywords: Bacillus amyloliquefaciens; perennial ryegrass; water retaining agent; synergistic effects; drought tolerance Bacillus amyloliquefaciens; perennial ryegrass; water retaining agent; synergistic effects; drought tolerance
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Su, A.-Y.; Niu, S.-Q.; Liu, Y.-Z.; He, A.-L.; Zhao, Q.; Paré, P.W.; Li, M.-F.; Han, Q.-Q.; Ali Khan, S.; Zhang, J.-L. Synergistic Effects of Bacillus amyloliquefaciens (GB03) and Water Retaining Agent on Drought Tolerance of Perennial Ryegrass. Int. J. Mol. Sci. 2017, 18, 2651.

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