In-Vitro Plant Growth Promotion of Rhizobium Strains Isolated from Lentil Root Nodules under Abiotic Stresses

Autor:	Ahmed Amri, Shiv Kumar, Said Boughribil, Youness En-nahli, Sara Fahde, Badreddine Sijilmassi, Abdelkarim Filali-Maltouf
Rok vydání:	2020
Předmět:	0106 biological sciences Root nodule phosphate solubilization Drought tolerance Rhizobia 01 natural sciences lcsh:Agriculture Indole Acetic acid 03 medical and health sciences chemistry.chemical_compound Gibberellic acid salt stress 030304 developmental biology Abiotic component 0303 health sciences biology Abiotic stress fungi drought stress lcsh:S food and beverages Azospirillum brasilense biology.organism_classification Plant Growth Promotion Horticulture chemistry Rhizobium Agronomy and Crop Science 010606 plant biology & botany
Zdroj:	Agronomy, Vol 10, Iss 1006, p 1006 (2020) Agronomy Volume 10 Issue 7
ISSN:	2073-4395
Popis:	Plant growth-promoting rhizobia are known to improve crop performance by multiple mechanisms. However, the interaction between host plants and Rhizobium strains is highly influenced by growing conditions, e.g., heat, cold, drought, soil salinity, nutrient scarcity, etc. The present study was undertaken to assess the use of Rhizobium as plant growth promoters under abiotic stress conditions. Fifteen Rhizobium strains isolated from lentil root nodules were tested for phosphate solubilization activity (PSA) and phytohormones production under salt and drought conditions. The results showed that 15 Rhizobium strains were significant phosphate solubilizers, and indole acedic acid (IAA) and gibberellic acid (GA3) producers based on least significant difference (LSD) analysis (p &le 0.05). The highest rate of PSA was attributed to three strains namely, 1145N5, 1159N11, and 1159N32 with a range of 144.6 to 205.6 P2O5 (µ g/mL). The highest IAA production was recorded in the strain 686N5 with 57.68 ± 4.25 µ g/mL as compared to 50.8667 ± 1.41 µ g/mL and 37.32 ± 12.59 µ g/mL for Rhizobium tropici CIAT 899 and Azospirillum brasilense DSM-1690, respectively. Strain 318N2111 produced 329.24 ± 7.84 µ g/mL of GA3 as against 259.84 ± 25.55 µ g/mL for A. brasilense DSM-1690. R. tropici CIAT 899 showed tolerance to salt (5% NaCl) and drought (&psi = &minus 2.6 MPa) stress, whereas strain 686N5 showed an extremely high level of salt-tolerance (5% NaCl) and moderate level of drought tolerance (&psi 0.75 MPa). These results indicate different pathways for drought and salt tolerance mechanisms. The assessment of plant growth promoting (PGP) activities of Rhizobium showed differences between bacterial viability and bacterial PGP activity in terms of abiotic stress tolerance where bacterial PGP activity is interrupted before reaching the bacterial tolerance threshold. These results integrate a new concept of PGPR screening based on PGP activity under abiotic stress.
Databáze:	OpenAIRE
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