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首页> 美国卫生研究院文献>Microorganisms >Role of Beneficial Microorganisms and Salicylic Acid in Improving Rainfed Agriculture and Future Food Safety
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Role of Beneficial Microorganisms and Salicylic Acid in Improving Rainfed Agriculture and Future Food Safety

机译：有益微生物和水杨酸在改善雨量农业和未来食品安全方面的作用

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Moisture stress in rainfed areas has significant adverse impacts on plant growth and yield. Plant growth promoting rhizobacteria (PGPR) plays an important role in the revegetation and rehabilitation of rainfed areas by modulating plant growth and metabolism and improving the fertility status of the rhizosphere soils. The current study explored the positive role of PGPR and salicylic acid (SA) on the health of the rhizosphere soil and plants grown under rainfed conditions. Maize seeds of two different varieties, i.e., SWL-2002 (drought tolerant) and CZP-2001 (drought sensitive), were soaked for 4 h prior to sowing in 24-h old culture of strain P1 (accession no. ) and strain P2 (accession no. ). The foliar spray of SA (150 mg/L) was applied on 28-days old seedlings. The combined treatment of the consortium of PGPR and SA not only alleviated the adverse effects of low moisture stress of soil in rainfed area but also resulted in significant accumulation of leaf chlorophyll content (40% and 24%), chlorophyll fluorescence (52% and 34%) and carotenoids (57% and 36%) in the shoot of both the varieties. The PGPR inoculation significantly reduced lipid peroxidation (33% and 23%) and decreased the proline content and antioxidant enzymes activities (32% and 38%) as compared to plants grown in rainfed soil. Significant increases (>52%) were noted in the contents of Ca, Mg, K Cu, Co, Fe and Zn in the shoots of plants and rhizosphere of maize inoculated with the PGPR consortium. The soil organic matter, total nitrogen and C/N ratio were increased (42%), concomitant with the decrease in the bulk density of the rhizosphere. The PGPR consortium, SA and their combined treatment significantly enhanced the IAA (73%) and GA (70%) contents but decreased (55%) the ABA content of shoot. The rhizosphere of plants treated with PGPR, SA and consortium showed a maximum accumulation (>50%) of IAA, GA and ABA contents, the sensitive variety had much higher ABA content than the tolerant variety. It is inferred from the results that rhizosphere soil of treated plants enriched with nutrients content, organic matter and greater concentration of growth promoting phytohormones, as well as stress hormone ABA, which has better potential for seed germination and establishment of seedlings for succeeding crops.
机译：雨水区域的水分胁迫对植物生长和产量产生显着的不利影响。通过调节植物生长和新陈代谢并改善根际土壤的生育状态，促进植物生长促进reshobacteria（PGPR）在雨量地区的再培养和康复中起着重要作用。目前的研究探讨了PGPR和水杨酸（SA）对在雨水条件下生长的根际土壤和植物健康方面的积极作用。在播种24小时菌株P1（加入NO.）和菌株P2之前，在播种24小时培养之前浸泡4小时，沐浴玉米种子，即SWL-2002（干旱耐受）和CZP-2001（干旱敏感）。 （加入编号）。在28天的幼苗上施用SA（150mg / L）的叶面喷雾。 PGPR联盟的结合治疗不仅减轻了土壤中土壤低水分胁迫的不良反应，而且导致叶片叶绿素含量的显着积累（40％和24％），叶绿素荧光（52％和34在各种品种的拍摄中，％）和类胡萝卜素（57％和36％）。 PGPR接种显着降低了脂质过氧化（33％和23％），与雨水土壤中生长的植物相比，降低了脯氨酸含量和抗氧化酶活性（32％和38％）。在Ca，Mg，K Cu，Co，Co，Co，Co，Fe和Zn的含量中注意到显着增加（> 52％），玉米的玉米根茎与PGPR联盟的玉米根际。土壤有机物，总氮和C / N比增加（42％），随着根际散装密度的降低而伴随。 PGPR联盟，SA及其组合治疗显着增强了IAA（73％）和GA（70％）含量，但下降（55％）ABA芽含量。用PGPR，SA和联盟治疗的植物的根际显示IAA，GA和ABA含量的最大积累（> 50％），敏感品种比容忍品种更高。从结果推断出富含营养素含量，有机物质和促进植物激素的植物含量，有机物和更高浓度的生长的结果，以及胁迫激素ABA，这具有更好的种子萌发和成立幼苗的幼苗的潜力。

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