Abstract
Microbial inoculants are of great importance in agro-ecology and plants. However, the symbiotic effectiveness of strains may vary between species or within the same species. Aim of the study was to select experimental microbial strains of national origin, to know its impact on growth of sweet sorghum (Sorghum bicolor) in greenhouse and sterile soil. Five strains of arbuscular mycorrhizal fungi (AMF) and eight rhizobacteria (two of them mutagenized) were compared with non-inoculated plants as control. Variables measured were index of chlorophyll SPAD, plant height, stem diameter (from the middle section), fresh biomass from stem, leaf, panicle, radical, and stem sugars content (°Brix) of every two internodes. The results showed that in the majority of cases, microbial strains exceeded the values of variables compared with control plants. The highest values of chlorophyll (41.8 SPAD), stem diameter (13.5 mm) and total fresh biomass (144.3 g), were recorded with rhizobacterias BS410 (Herbaspirillum sp.), B2709 (Pseudomonas sp.) and B4M4 (Azospirillum sp.), respectively.
Highlights
Microbial inoculants or bio-fertilizers, based on arbuscular mycorrhizal fungi (AMF) and plant growth promoting bacteria (PGPR), currently have great ecological and economic importance in agriculture
The inoculum of AMF was ≥60 spores g−1 of soil and rhizobacteria with a concentration of 107 - 108 UFC g−1 in peat
The results showed that all measured variables, manifested symbiotic effect of inoculated microbial strains and who in most cases exceeded the values of control plants (Table 1)
Summary
Microbial inoculants or bio-fertilizers, based on arbuscular mycorrhizal fungi (AMF) and plant growth promoting bacteria (PGPR), currently have great ecological and economic importance in agriculture. The preparation of microbial inoculants effectively is of great importance such as biotechnology in agriculture, those with economic viability. The positive effect of rhizosphere bacteria colonizing in grasses, based on its production of plant growth stimulating substances, has been demonstrated by different authors [3] [4]. Sweet sorghum (Sorghum bicolor) is a crop used in the production of refined sugar, alcohol, biofuel, among others [13] [14]. This sort of grass is important since it shows comparative advantages over other crops. The objective of the study was to select experimental microbial strains of national origin, to know its impact on the growth of sorghum sweet under greenhouse conditions
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