Among the environmental factors, soil salinity is one of the most detrimental factors affecting plant growth and productivity. Nutritional-imbalance is also known as one of the negative effects of salinity on plant growth and productivity. Among the essential plant nutrients, phosphorus (P) is a nutrient in which the uptake, transport, and distribution in plant is adversely affected by salinity-stress. Salinity-stress-mediated low a P availability limits the crop production. Adding additional P fertilizer is generally recommended to manage P deficit in saline-soils; however, the low-efficiency of available P fertilizer use in salt-affected soils, restricts P availability, and P fertilizers are also a cause of significant environmental concerns. The application of salinity-tolerant phosphate–solubilizing-bacteria (ST-PSB) can be as a greatly effective and economical way to improve the P availability, and recover the P-deficit in saline-land. This review focuses on soil salinization and its effect on P availability, the mechanisms of P solubilization by ST-PSB, ST-PSB diversity, their role in alleviating salinity stress in plants, the current and future scenarios of their use, and the potential application of this knowledge to manage the sustainable environmental system. According to this review, adding ST-PSB to saline soils could be an alternative for alleviating the negative effects of salinity on plants and may ameliorate salinity tolerance.

Heavy metals (HMs) pollution is a serious problem, worldwide. The present study focuses on HMs removal (HMs mobility restricted within soil) by microbial induced mineral precipitation (MIMP) using indigenous isolates. Indigenous isolates were identified as Bacillus subtilis C(225)(MK334652), Oceanobacillus indicireducens 5(225)(MK334653), and Bacillus pumilus 7(225)(MK334654) by 16S-rRNA from HMs polluted industrial-soil (soil-225) that is used for bioremediation. The studied soil contained high level (mg/kg) of Cr(307.41 ± 1.02), Cu(576.35 ± 1.02), and Zn(708.81 ± 1.50) as per Taiwan permissible limit (TPL) and/or Canadian Soil Quality Guidelines (CSQG). Minimum inhibitory concentration (MIC) of Bacillus species were higher compare to Oceanobacillus. Bioavailable-fraction (F₁) of HMs (Cr/Cu/Zn) in untreated 225-soil was noticed to be higher compared to F₂–F₅ fraction. Bacillus subtilis C(225) are more efficient for HMs-mineralization, compared to other isolates where Cr/Cu/Zn immobilized within soil, transforming from bioavailable-fraction (F₁) (high-mobility) (60–90% reduction) to residual-fraction F₅ (low-mobility) (50–80% increment). Organic-bound-fraction (F₄) (medium-mobility) of Cr increased (42.66 ± 2.1%), compared to Cu/Zn, by Bacillus subtilis C(225). Urease (40.8%) and dehydrogenase (8.3%) activity increased in bio-remediated soil, compared to control. MIMP of HMs by ingenious bacteria reflects the transformation-pathway from F₁ to F₅ of HMs to fix strongly within soils with inadequate mobility. Thus, MIMP by indigenous microbe can be applicable for HMs stabilization/removal in contaminated soil for ecofriendly environmental cleanup.

Recently developed non-invasive environmental DNA-based (eDNA) techniques have enlightened modern conservation biology, propelling the monitoring/management of natural populations to a more effective and efficient approach, compared to traditional surveys. However, due to rapid-expansion of eDNA, confusion in terminology and collection/analytical pipelines can potentially jeopardize research progression, methodological standardization, and practitioner adoption in several ways. Present investigation reflects the developmental progress of eDNA (sensu stricto) including highlighting the successful case studies in conservation management. The eDNA technique is successfully relevant in several areas of conservation research (invasive/conserve species detection) with a high accuracy and authentication, which gradually upgrading modern conservation approaches. The eDNA technique related bioinformatics (e.g., taxon-specific-primers MiFish, MiBird, etc.), sample-dependent methodology, and advancement of sequencing technology (e.g., oxford-nanopore-sequencing) are helping in research progress. The investigation shows that the eDNA technique is applicable largely in (i) early detection of invasive species, (ii) species detection for conservation, (iii) community level biodiversity monitoring, (iv) ecosystem health monitoring, (v) study on trophic interactions, etc. Thus, the eDNA technique with a high accuracy and authentication can be applicable alone or coupled with traditional surveys in conservation biology. However, a comprehensive eDNA-based monitoring program (ecosystem modeling and function) is essential on a global scale for future management decisions.