PGPR Potentially Improve Growth of Tomato Plants in Salt-Stressed Environment

Abstract

Plant growth promoting rhizobacteria are colonized bacterial species that has the capability to improve plant growth by certain direct and indirect means. Environmental factors including both biotic and abiotic stresses are among the major constraints to crop production. In the current study, the effectiveness of microbial inoculation (Bacillus megaterium) for enhancing growth of tomato plants under salt stress conditions has been investigated. Significant improvement in shoot length, root length, leaf surface area, number of leaves, total weight of the shoot and root was observed in tomato plants inoculated with zm7 strain post 15 and 30 days of its application. Zm3, Zm4 and Zm6 strains improved the morphological parameters as compared to the control. Chlorophyll content a, chlorophyll content b, anthocyanin and carotenoid content was increased in tomato plants subjected to Zm7, Zm6 and Zm4 strains. Stress responsive genes; metallothionein and glutothion gene were found highly expressed in Zm7 treated tomato plants as compared to control, untreated plants. Significant correlation of anthocyanin was reported for carotenoids, chlorophyll-b, shoot weight and total weight of seedling while carotenoids were significantly correlated with leaf surface area, root length, chlorophyll-b and anthocyanin. Overall, Zm7 strain proved best for improvement in salt stressed plant’s morphological parameters and biochemical parameters as compared to control, untreated plants.

Phytostimulatory Influence of Comamonas testosteroni and Silver Nanoparticles on Linum usitatissimum L. under Salinity Stress

“…As we observed, C. testosteroni have a significant part in salt tolerance and enhancing the development of Linum usitatissimum L. Comparable outcomes were obtained by Razzaghi et al [42], who stated that the stimulatory effect of salinity-tolerant bacteria could be ascribed to improved mineral, nitrogen, and water uptake. Likewise, Zameer et al [43] stated that plant development advancing rhizobacteria proved best for improving chlorophyll-a, chlorophyll-b, carotenoid, and anthocyanin of NaCl stressed tomato [43]. It is well known that proline and total soluble sugars are important natural solutes that keep the cell homeostasis and assist in cell osmoregulation under salinity stress and their aggregation in plants correlates with enhanced salt resilience.…”

Halo-tolerant plant growth promoting rhizobacteria for improving productivity and remediation of saline soils

“…EJ01 Increased expression of DREB2b, RD29A, RD29B and RAB18 Expression of P5CS1, P5CS2 , MPK3 and MPK6 Proline biosynthesis, regulation of defense pathways and salt responses [34] 8. Solanum lycopersicum Bacillus megaterium Expression of MT2 and GR1 Metallothionein Glutathione reductase enzyme synthesis [35] 9.. G. max Bacillus firmus SW5 Upregulation of GmVSP, GmPHD2, GmbZIP62, GmWRKY54, GmOLPb and CHS Expression of APX, CAT, Fe-SOD and POD Antioxidant enzyme production, tolerance to salinity, flavonoid biosynthetic pathway [24] 10. Zea mays L. Bacillus amyloliquefaciens SQR9 Upregulation of RBCS, RBCL, H+‐PPase, HKT1, NHX1, NHX2 and NHX3 Downregulation of NCED Photosynthesis, Na + export and sequestration [36] 11.…”

Pengaruh Aplikasi Mikroba terhadap Fisiologis Beberapa Varietas Padi Fase Vegetatif pada Kondisi Salin Tergenang

“…Mikroba (pupuk hayati) mampu meningkatkan toleransi tanaman terhadap garam dan mengurangi salinitas tanah (Machado & Serralheiro, 2017), meningkatkan pertumbuhan dan produktivitas tanaman (Ansari et al, 2017), berperan penting dalam penyediaan hara dalam tanah (Rahayu et al, 2021), dan memperbaiki lahan (Prikhodko et al, 2020). Menurut Zameer et al (2016) et al, 2018), meningkatkan biosintesis dan akumulasi osmolit yang sesuai seperti gula, prolin, glisin betain, poliamina, dan protein (Liu et al, 2022). Sujinah et al (2020) melaporkan tingkat adaptasi tanaman terhadap cekaman rendaman stagnan dipengaruhi oleh karakter agronomi dan fisiologi, seperti pertambahan tinggi tanaman, laju pemanjangan batang, pembentukan aerenkim, perpanjangan umur berbunga, pengurangan jumlah anakan, klorofil, karbohidrat nonstruktural, jumlah gabah per malai, dan persentase gabah isi.…”