Relative potential of Rhizobium sp for improving the rice-wheat crop in the semi-arid regions

Abstract

Soil Microbiologists have been concentrating on manipulation of rhizosphere microbes in cereals, but many researchers have reported that rhizobia can act as plant growth promoting rhizobacteria (PGPR). Rhizobium species impacted the crop ontogeny by root / endophytic colonization, producing phytohormones, efficient nutrient use and nutrient solubilization / mineralization. Field studies were performed at Soil Bacteriology Section and Soil Chemistry Section, Faisalabad to assess the comparative potential of Rhizobium species for promoting the growth, yield of wheat and rice. Auxin biosynthesis potential of isolates of Rhizobium species (mung (Vigna radiata), berseem (Trifolium alexandrinum), chickpea (Cicer arietinum), lentil (Lens culinaris) and peanut (Arachis hypogaea)) was determined and isolates of each species having higher values were used for field experiments. Assay for root / shoot elongation, root colonization in plates were carried out under controlled conditions. The rhizosphere soil of wheat and rice were assayed for the Indole Acedic Acid (IAA) content 15 and 30 days after germination / transplanting, respectively. Results revealed that significant increase was observed in the yield parameters of wheat and rice. Highest wheat grains were produced i.e., 4917 kg ha-1 with Rhizobium sp of mungbean (Mb3) followed by 4823 with Rhizobium sp of berseem (Br3) than control i.e., 4500 kg ha-1. Similarly, the maximum paddy yield i.e., 4667 kg ha-1 with Rhizobium sp of mungbean (Mb3) followed by 4625 Rhizobium sp of berseem (Br3) inoculation was obtained as compared to control i.e., 4208 kg ha-1. Other physical parameters of wheat and rice also showed positive response to inoculation and have elevated levels of IAA in the rhizosphere of inoculated treatments. Results clearly demonstrated that Rhizobium species increased the yield of rice and wheat.

Comparative Potential of Rhizobial Species on Wheat Productivity and Soil Status

“…(Mung bean) significantly increased nitrogen and leaf protein contents. This results partially agreed with those obtained by [7] concerning wheat plants. Rhizobial bacteria improved wheat, cotton and maize growth by mobilizing more nutrients, and increasing NPK uptake, this may either be due to the ability of rhizobial inoculums to act as PGPR, and solubilize and mobilize nutrients from organic and inorganic sources according to Adnan et al [14].…”

“…Biofertilizer also known microbial inoculants are the substance that either solid or liquid substances contains beneficia1 microbes that have participated in different functions for promoting plant growth. Biofertilizer are environment friendly, inexpensive, and reasonable source that have potential role,, in the plant growth promotion [7]. Many microbiologists of soi1 have been concentrating on manipulation in cereals rhizosphere microbes, but many researchers have found that rhizobial bacteria can act as plant growth of promoting rhizobacteria (PGPR).…”

The impact of Klebsiella quasipneumoniae inoculation with nitrogen fertilization on baby corn yield and cob quality

“…Additionally, PGPR and legumes can form bio-interactions, with roots secreting compounds that promote vigorous plant growth. PGPR also plays a protective role by producing antibiotics to prevent root rot diseases and contribute to overall plant health (Qureshi et al 2022). Moreover, PGPR's contribution extends to macronutrient provision, particularly nitrogen, influencing crop growth (Mendes et al, 2013;Lazcano et al, 2021).…”