Applied Phycology and Biotechnology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
Arch Microbiol. 2021 Jul;203(5):2659-2667. doi: 10.1007/s00203-021-02226-5. Epub 2021 Mar 13.
Soil salinity is one of the major limiting factors for poor crop yield in the world. Increasing salinity in the soil is a challenge for agriculture. In the recent past, plant growth-promoting rhizobacteria (PGPR) are being used to enhance plant growth in various conditions. However, the saline-tolerant PGPR are of great use for plant growth under saline condition. In the present study, saline-tolerant E. hormaechei (MF957335) was isolated from saline water. E. hormaechei (MF957335) was tested for its potassium and calcium solubilizing efficiency using Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX). E. hormaechei (MF957335) and K-Feldspar treatments significantly increased plant growth as compared to untreated plants (negative control). E. hormaechei (MF957335) significantly increased fresh biomass, shoot and root length of tomato plants. Among all the NaCl treatments, maximum fruits (9.66) were achieved in 250 mM NaCl + E. hormaechei treatment. Similar results with increased fruit numbers were obtained in K-Feldspar-treated plants. Apart from the plant growth, fresh biomass and fruit numbers, tomatoes from K-Feldspar-treated plants were large, fleshy and deep red colored. The study could demonstrate bioavailability of potassium from K-feldspar for tomato cultivation. Control plants tomato were small, non-fleshy, yellowish red, and infected with calcium deficiency disease blossom-end rot. The present study demonstrates the role of E. hormaechei (MF957335) in plant growth, yield promotion and disease tolerance by potassium and calcium solubilization, respectively. The study showed that E. hormaechei (MF957335) could be applied to saline and non-saline soils to enhance tomato yield.
土壤盐度是全球作物产量低的主要限制因素之一。土壤中盐分的增加对农业是一个挑战。在最近的过去，植物促生根际细菌（PGPR）被用于在各种条件下促进植物生长。然而，耐盐性 PGPR 对于植物在盐胁迫条件下的生长非常有用。在本研究中，从咸水中分离出耐盐性 E. hormaechei（MF957335）。使用扫描电子显微镜-能量色散 X 射线（SEM-EDX）测试了 E. hormaechei（MF957335）的钾和钙溶解效率。与未处理的植物（阴性对照）相比，E. hormaechei（MF957335）和 K-长石处理显著增加了植物的生长。E. hormaechei（MF957335）显著增加了番茄植物的鲜生物量、茎和根长。在所有 NaCl 处理中，在 250 mM NaCl+E. hormaechei 处理中获得了最多的果实（9.66 个）。在 K-长石处理的植物中也获得了果实数量增加的类似结果。除了植物生长、鲜生物量和果实数量外，K-长石处理的番茄果实大、肉质厚、颜色呈深红色。该研究证明了 K-长石中钾的生物有效性可用于番茄种植。对照植物番茄植株较小，肉质少，呈黄红色，且感染缺钙性疾病脐腐病。本研究表明，E. hormaechei（MF957335）通过分别溶解钾和钙来促进植物生长、提高产量和增强对疾病的耐受性。该研究表明，E. hormaechei（MF957335）可应用于盐碱地和非盐碱地，以提高番茄产量。
