| Enhanced drought tolerance in maize conferred by a consortium of plant growth-promoting rhizobacterium strains |
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| DOI：10.7606/j.issn.1000-7601.2018.01.20 |
| Key Words: maize drought tolerance plant growth-promoting rhizobacterium (PGPR) abscisic acid (ABA) |
| Author Name | Affiliation | | WANG Chao | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of PR China, Nanjing, Jiangsu 210042, China | | LI Gang | Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of PR China, Nanjing, Jiangsu 210042, China | | XIE Yue-sheng | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | GAO Yan-lin | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | GUO Jian-hua | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | XU Quan | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China |
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| Abstract: |
| A consortium of plant growth-promoting rhizobacterium (PGPR) strains BBS was demonstrated to enhance tolerance to drought stress in plants. Here, under drought stress, physiological characteristics and transcription of stress-related genes in leaves of maize plants treated with BBS were investigated. After withholding watering for 15 days, BBS-treated maize seedlings had substantially lighter wilt symptoms than control plants. In relation to the control, BBS treatment decreased the leaf monodehydroascorbate (MDA) content by 25.65%, and increased the leaf proline and soluble sugars content by 3.39-fold and 7.28%, respectively. It activated significantly higher transcription of ZmP5CS1 gene, and significantly enhanced the activity of superoxide dismutase (SOD), a major antioxidant enzyme. Additionally, BBS inoculated plants had significantly lower leaf H2O2 content during drought stress than the control plants. Consequently, BBS efficiently extenuated the drought-induced injury in maize seedlings and facilitated post-drought recovery. Moreover, the stimulated expression of NCED1 and ZmDREB2.7 indicated the involvement of ABA-dependent and ABA-independent signaling pathways in BBS-maize interaction under water deficit. |
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