The role of endophytic bacteria in increasing nitrogen concentration, root length, and dry weight of rice plants (Oryza sativa L.) in saline soil

Mieke Rochimi Setiawati, Gita Andrawina Cendekia, Diyan Herdiyantoro, Pujawati Suryatmana, Nadia Nuraniya Kamaluddin, Tualar Simarmata
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Abstract

Soil salinity can interfere with the absorption of water and plant nutrients, causing a decrease in growth and yield of rice plants in saline soil. This negative effect can be reduced by the application of endophytic bacteria biofertilizer. Endophytic bacteria live in plant tissues and play a role in increasing plant growth through nitrogen fixation or growth hormone production. The purpose of this study was to determine the effect of endophytic bacterial biofertilizer application on N concentration, root length, and dry weight of rice seedlings (Oryza sativa L.) in soils with different salinities. This research was conducted in the greenhouse of the Faculty of Agriculture, Universitas Padjadjaran. The experimental design used was a Randomized Block Design (RBD) with 8 combinations. The treatments were with and without endophytic bacterial biofertilizers, and soils with different levels of salinity (non-saline soil and saline soil with salinities of 2, 4, and 6 mmhos cm-1) and repeated 4 times. The experimental results showed that the combination treatment of endophytic bacterial biofertilizer in saline soil of 2 mmhos cm-1 was able to increase the N concentration, root length, and dry weight of rice plants which were higher than the treatment of endophytic bacterial biofertilizer in soil with salinity of 4 and 6 mmhos cm-1. The application of endophytic bacteria biofertilizer has higher dry weight of rice plants than without endophytic bacteria at each different salinity level.
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内生细菌在提高盐碱土壤中水稻植株氮浓度、根长和干重方面的作用
土壤盐分会影响水分和植物养分的吸收,导致盐碱土壤中水稻植株的生长和产量下降。施用内生细菌生物肥料可以减少这种负面影响。内生细菌生活在植物组织中,通过固氮作用或产生生长激素,在促进植物生长方面发挥作用。本研究的目的是确定施用内生细菌生物肥对不同盐度土壤中水稻幼苗(Oryza sativa L.)的氮浓度、根长和干重的影响。这项研究在 Padjadjaran 大学农学院的温室中进行。实验设计采用随机区组设计(RBD),共有 8 种组合。处理包括使用和不使用内生细菌生物肥料,以及不同盐度的土壤(非盐碱土壤和盐度为 2、4 和 6 mmhos cm-1 的盐碱土壤),重复 4 次。实验结果表明,在盐度为 2 mmhos cm-1 的盐碱土中施用内生细菌生物肥料,能提高水稻植株的氮浓度、根长和干重,其效果高于在盐度为 4 mmhos cm-1 和 6 mmhos cm-1 的土壤中施用内生细菌生物肥料。在每个不同的盐度水平下,施用内生细菌生物肥料的水稻植株干重均高于未施用内生细菌生物肥料的植株。
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