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根际细菌生产胞外多糖和吲哚乙酸(IAA)及其对旱稻抗旱性的潜在作用。

Production of Exopolysaccharides and İndole Acetic Acid (IAA) by Rhizobacteria and Their Potential against Drought Stress in Upland Rice.

机构信息

Department of Biology, Faculty of Mathematics and Natural Sciences, Riau University. Kampus Bina Widya Km. 12,5 Simpang Baru Pekanbaru, Riau Province 28293, Indonesia.

出版信息

J Microbiol Biotechnol. 2024 Jun 28;34(6):1239-1248. doi: 10.4014/jmb.2401.01035. Epub 2024 May 14.

Abstract

Peatlands are marginal agricultural lands due to highly acidic soil conditions and poor drainage systems. Drought stress is a big problem in peatlands as it can affect plants through poor root development, so technological innovations are needed to increase the productivity and sustainability of upland rice on peatlands. Rhizobacteria can overcome the effects of drought stress by altering root morphology, regulating stress-responsive genes, and producing exopolysaccharides and indole acetic acid (IAA). This study aimed to determine the ability of rhizobacteria in upland rice to produce exopolysaccharides and IAA, identify potential isolates using molecular markers, and prove the effect of rhizobacteria on viability and vigor index in upland rice. Rhizobacterial isolates were grown on yeast extract mannitol broth (YEMB) medium for exopolysaccharides production testing and Nutrient Broth (NB)+L-tryptophan medium for IAA production testing. The selected isolates identify using sequence 16S rRNA. The variables observed in testing the effect of rhizobacteria were germination ability, vigour index, and growth uniformity. EPS-1 isolate is the best production of exopolysaccharides (41.6 mg/ml) and IAA (60.83 ppm). The isolate EPS-1 was identified as using 16S rRNA sequencing and phylogenetic analysis. The isolate EPS-1 can increase the viability and vigor of upland rice seeds. is more adaptive and has several functional properties that can be developed as a potential bioagent or biofertilizer to improve soil nutrition, moisture and enhance plant growth. The use of rhizobacteria can reduce dependence on the use of synthetic materials with sustainable agriculture.

摘要

泥炭地由于土壤条件高度酸化和排水系统不良,是边缘性农业用地。干旱胁迫是泥炭地的一个大问题,因为它会通过根系发育不良影响植物,因此需要技术创新来提高旱地水稻在泥炭地上的生产力和可持续性。根际细菌可以通过改变根系形态、调节应激响应基因以及产生胞外多糖和吲哚乙酸 (IAA) 来克服干旱胁迫的影响。本研究旨在确定旱地水稻根际细菌产生胞外多糖和 IAA 的能力,使用分子标记物鉴定潜在的分离株,并证明根际细菌对旱地水稻活力和活力指数的影响。将根际细菌分离株在酵母提取物甘露醇肉汤 (YEMB) 培养基上培养以进行胞外多糖生产测试,在营养肉汤 (NB)+L-色氨酸培养基上进行 IAA 生产测试。使用 16S rRNA 对选定的分离株进行鉴定。测试根际细菌影响的变量包括发芽能力、活力指数和生长均匀度。EPS-1 分离株是胞外多糖(41.6 mg/ml)和 IAA(60.83 ppm)产量最高的分离株。通过 16S rRNA 测序和系统发育分析鉴定 EPS-1 分离株为。EPS-1 分离株可以提高旱地水稻种子的活力和活力。 是一种更适应环境的细菌,具有多种功能特性,可开发为潜在的生物制剂或生物肥料,以改善土壤营养、水分并促进植物生长。使用根际细菌可以减少对可持续农业中合成材料的依赖。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3afd/11239409/b1e4371fcc5e/jmb-34-6-1239-f1.jpg

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