Department of Botany, Savitribai Phule Pune University, Pune 411 007, India.
National Centre for Microbial Resource (NCMR), National Centre for Cell Science (NCCS), Pune 411 021, India.
Microbiol Res. 2022 Oct;263:127157. doi: 10.1016/j.micres.2022.127157. Epub 2022 Aug 3.
Rice is a major food crop cultivated around the globe. Specially scented rice varieties are of commercial importance but they are low-yielding. The rhizospheric microflora plays a significant role in improving yield and aroma. However, the core microbiome of the scented rice rhizosphere is comparatively less explored. Here, we analyzed the core microbiome associated with the rhizosphere of the scented (Ambemohar-157 and Dehradun basmati) in comparison with non-scented rice (Kolam and Arize 6444 Gold) cultivated at two different geoclimatic zones of India (Maharashtra and Uttarakhand) using the metagenomics approach. The alpha and beta diversity analysis showed that the microbial communities associated with scented and non-scented varieties significantly changes with respect to richness, diversity, and evenness. The taxonomic profiling revealed the variation in composition, diversity, and abundance of the microbiome in terms of phyla and genera associated with scented rice varieties over non-scented. The cluster analysis distinguishes the microbial communities based on their geographical positions. The core microbiome analysis revealed that scented rice rhizosphere shelters distinct and unique microbiota. 28.6 % of genera were exclusively present only in the scented rice rhizosphere. The putative functional gene annotation revealed the high abundance of genes related to the biosynthesis of 2-acetyl-1-pyrroline (2AP) precursors in scented rice. The precursor feeding analysis revealed proline as a preferred substrate by 2AP synthesizing bacteria. The 2AP precursor proline and proline metabolism genes showed a positive correlation. The scented rice-specific rhizobacteria pointed out in this study can be used as bio-inoculants for enhancing aroma, yield, and sustainable rice cultivation.
水稻是全球广泛种植的主要粮食作物。具有特殊香气的水稻品种具有商业重要性,但产量较低。根际微生物在提高产量和香气方面起着重要作用。然而,香米根际的核心微生物群尚未得到充分探索。在这里,我们使用宏基因组学方法分析了来自两个不同印度地理区域(马哈拉施特拉邦和北阿坎德邦)的香米(Ambemohar-157 和 Dehradun basmati)与非香米(Kolam 和 Arize 6444 Gold)根际相关的核心微生物群。α和β多样性分析表明,与丰度、多样性和均匀度有关,与香米和非香米品种相关的微生物群落显著变化。分类 profiling 揭示了香米品种与非香米品种相关的微生物群落在组成、多样性和丰度方面的变化。聚类分析根据其地理位置区分微生物群落。核心微生物组分析表明,香米根际栖息着独特而独特的微生物群。28.6%的属仅存在于香米根际中。假定功能基因注释显示与 2-乙酰-1-吡咯啉(2AP)前体生物合成相关的基因丰度较高。前体喂养分析表明,2AP 合成细菌优先使用脯氨酸作为底物。2AP 前体脯氨酸和脯氨酸代谢基因呈正相关。本研究中指出的香米特异性根际细菌可用作生物接种剂,以提高香气、产量和可持续水稻种植。