Comparative efficacy of different salt tolerant rhizobial inoculants in improving growth and productivity of Vigna radiata L. under salt stress

Abstract

Worldwide, salinity severely affects agricultural production of crops such as mung bean in arid and semi-arid regions. In saline conditions, various species of Rhizobium can be used to enhance nodulation and induce salinity tolerance in maize. The present study conducted a pot experiment to determine the efficiency of three rhizobial isolates under different salinity conditions, such as 1.41, 4 and 6 dS m−1, on mung bean growth parameters, antioxidant status and yield. Results revealed that salt stress imparted adverse effects on the growth, antioxidants, yield and nodulation of mung bean. Under high salt stress conditions, fresh weights were reduced for roots (78.24%), shoots (64.52%), pods (58.26%) and height (32.33%) as compared to un-inoculated control plants. However, an increase in proline content (46.14%) was observed in high salt stressed plants. Three Rhizobium isolates (Mg1, Mg2, and Mg3), on the other hand, mitigated the negative effects of salt stress after inoculation. However, effects of Mg3 inoculation were prominent at 6 dS m−1 and it enhanced the plant height (45.10%), fresh weight of shoot (58.68%), root (63.64%), pods fresh weight (34.10%), pods number per plant (92.04%), and grain nitrogen concentration (21%) than un-inoculated control. Rhizobium strains Mg1, and Mg2 expressed splendid results at 1.41 and 4 dS m−1 salinity stress. The growth promotion effects might be due to improvement in mineral uptake and ionic balance that minimized the inhibitory effects caused by salinity stress. Thus, inoculating with these strains may boost mung bean growth and yield under salinity stress.

Mitigation effect of alpha-tocopherol and thermo-priming in Brassica napus L. under induced mercuric chloride stress

“…As a result, typically dormant stress-related genes are rapidly activated by environmental stress [ 15 ]. Plant interactions with environmental stress factors are known to contribute to the initiation of various defense mechanisms [ 16 , 17 ], resulting in qualitative and/or quantitative improvements in the development of plant metabolites, activation of hormone signaling pathways regulated by abscisic acid (ABA), salicylic acid, jasmonic acid, and ethylene, as well as reactive oxygen species (ROS) signaling pathways [ 18 ]. Furthermore, Abiotic stresses include cold, dryness, salt, and heavy metals mostly affect plant development and agricultural yield [ 16 ].…”

“…Mercury is ubiquitous, being found in all ecospheres as well as igneous rocks in trace quantities. Growing research has shown that Hg 2+ can be stored freely in advanced and aquatic plants [ 17 ].…”

Production of some Secondary Metabolites of Antibiotic Nature from Mycorrhizal Helper Bacteria (MHB) Associated with Conifers

“…Plant growth-promoting rhizobacteria (PGPR) can support plant development through a variety of processes [5][6][7][8]. They can act directly by producing chemicals that stimulate growth and improve nutrient availability in the soil or indirectly by suppressing plant diseases in the rhizosphere [9][10][11]. Although research on PGPR in agriculture settings has progressed, much more research is needed on this group of bacteria in forest habitats [12].…”

Alleviating salinity stress in canola (Brassica napus L.) through exogenous application of salicylic acid

“…Salt stress significantly decreases crop yields on infertile and partially fertile lands, leading to a reduction of over 50% in standard yields. This reduction in crop productivity is primarily attributed to the disruption of the plants' nutritional and water balance [ 7 – 10 ]. The ability of plants to withstand high salt levels is an intricate process, involving various factors such as morphological, physiological, and biochemical mechanisms [ 8 , 10 , 11 ].…”