Using of Microbial Fertilizer as Biostimulant Alleviates Damage from Drought Stress in Guar (<i>Cyamopsis Tetragonoloba</i> (L.) Taub.) Seedlings

Abstract

Drought is a significant environmental stress that limits plant growth and yield. In this study, an investigation of guar, grown under different drought level conditions [(S0: 100% of field capacity), S1 (depletion of 75% the available water holding capacity), S2 (depletion of 50% the available water holding capacity), S3 (depletion of 25% the available water holding capacity), S4 (no applied irrigation water)] with regards to the impact of Chlorella vulgaris based microbial fertilizer on physiological, morphological, and enzymatic activity was performed. Microbial fertilizer applications significantly increased shoot length, fresh and dry weight of the shoot and root, and leaf number and area of guar plants compared to the only drought stress treatments. In addition, following the above-mentioned procedures, there were significant increases in the relative water content, total phenolic and flavonoid contents, superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and glutation reductase (GR) activity. However, the malondialdehyde (MDA) content were significantly decreased. Hence, the results support the administration of a foliar application to the microbial fertilizer containing microalgae in order to increase the guar plant’s defense system, enabling it to tolerate the negative effects resulting from drought stress.

The Use of Microalgae and Cyanobacteria in the Improvement of Agricultural Practices: A Review on Their Biofertilising, Biostimulating and Biopesticide Roles

“…Microalgae and cyanobacteria produce a wide variety of metabolites that, due to their biological activity, can be used in agriculture as biofertilisers, biostimulants or biopesticides. Among these metabolites, phenolic compounds, terpenoids, FFAs, polysaccharides, carotenoids and phytohormones are of particular interest, as they have already been identified as plant-growth promotors [2,7,12]. Table 1 presents the main biologically-active Biofertilisers are biologically-based compounds that promote an improvement in crops' productivities through their activity at the soil level.…”

“…Table 1 presents the main biologically-active Biofertilisers are biologically-based compounds that promote an improvement in crops' productivities through their activity at the soil level. Typically, these compounds and/or microorganisms are responsible for the improvement of soil properties and soils' fertility, providing the essential nutrients (e.g., nitrogen, phosphorus and potassium) for plants' growth [4,8,12,13]. Depending on their beneficial effects and on the microorganisms integrating these formulations, biofertilisers can be classified as [8,14]: (i) plant-growthpromoting bacteria; (ii) compost; (iii) nitrogen-fixators; (iv) phosphate-and potassiumsolubilising biofertilisers; and (v) phosphorus-mobilising biofertilisers.…”

Multipurpose Agricultural Reuse of Microalgae Biomasses Employed for the Treatment of Urban Wastewater

“…Biofertilizers are biologically-based compounds that promote an improvement in crops' yields through their activity at the soil level, providing macro-and micronutrients for plant growth [52][53][54][55]. Typically, these products are applied as biomass.…”

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“…Kusvuran & A. Can (2020) and A. Kusvuran & C. Kusvuran (2019) investigated the effect of a liquid fertilizer containing the microalgae Chlorella vulgaris Beijer. on the nutrient content of the aboveground mass of Cyamopsis tetragonoloba (L.) Taub.…”