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解淀粉芽孢杆菌（GB03）与保水剂协同提高黑麦草抗旱性。

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

机构信息

State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China.

Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.

出版信息

Int J Mol Sci. 2017 Dec 11;18(12):2651. doi: 10.3390/ijms18122651.

DOI:10.3390/ijms18122651
PMID:29232909
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5751253/
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 strain GB03 and WRA (the compound is super absorbent hydrogels) on drought tolerance of perennial ryegrass ( 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.

摘要

保水剂（WRA）广泛用于土壤侵蚀控制和农业节水。在这里，我们评估了有益土壤细菌菌株 GB03 和 WRA（复合超吸水性水凝胶）组合对多年生黑麦草（ L.）耐旱性的影响。通过停止浇水，使幼苗经受长达 20 天的自然干旱，然后再浇水 7 天。测量植物存活率、生物量、光合作用、水分状态和叶片细胞膜完整性。结果表明，在严重干旱胁迫下（20 天自然干旱），与对照相比，GB03、WRA 和 GB03+WRA 均显著提高了 Shoot 鲜重、干重、相对含水量（RWC）和叶绿素含量，降低了叶片相对电导率（REC）和叶片丙二醛（MDA）含量；GB03+WRA 显著提高了叶绿素含量与对照和其他两种处理相比。复水 7 天后，GB03、WRA 和 GB03+WRA 均显著提高了植物存活率、生物量、RWC 并维持了叶绿素含量与对照相比；GB03+WRA 显著提高了植物存活率、生物量和叶绿素含量与对照和其他两种处理相比。结果表明，保水剂与保水剂共同作用通过提高存活率和维持叶绿素含量来促进黑麦草在干旱条件下的生长。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4f49/5751253/f9b519c2a200/ijms-18-02651-g007.jpg
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