Influence of Commercial Seaweed Extract and Microbial Biostimulant on Growth, Yield, Phytochemical Content, and Nutritional Quality of Five Abelmoschus esculentus Genotypes

Aremu, Adeyemi Oladapo; Makhaye, Gugulethu; Tesfay, S.Z.; Gerrano, Abe Shegro; Plooy, C. P. du; Amoo, Stephen O.

doi:10.3390/agronomy12020428

Cited by 9 publications

(5 citation statements)

References 65 publications

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“…Compared to individual treatments, St+SWE had additive and synergistic effects to improve growth and productivity in mangroves. Similar observations have been reported in crop plants using a combination of PGPR bioinoculants and SWE biostimulants (Ngoroyemoto et al, 2020;Aremu et al, 2022). Despite the benefits of PGPR on the growth and yield of Salicornia and mangroves (Bashan et al, 2000;Komaresofla et al, 2019;Mathew et al, 2020;El-Tarabily et al, 2021a), the impact of the co-application of SWE and rhizosphere and/or endophytic PGPA in marine agriculture is still meager.…”

Section: Discussionsupporting

confidence: 72%

The Multifarious Endophytic Actinobacterial Isolate, Streptomyces tubercidicus UAE1, Combined With the Seaweed Biostimulant Further Promotes Growth of Avicennia marina

et al. 2022

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Mangrove (Avicennia marina) is a “green lung” tree growing along the Arabian Gulf coastline in the United Arab Emirates. Here, we aimed to determine the impact of the application of a commercial seaweed extract (SWE) biostimulant and endophytic actinobacterial isolates on growth performance and endogenous hormonal levels of mangroves. Therefore, we isolated endophytic plant growth-promoting (PGP) actinobacteria (PGPA) from mangrove roots and evaluated their potential as biological inoculants on mangrove seedlings under greenhouse and open-field nursery conditions. Seven salt-tolerant isolates had the ability to produce different levels of in vitro plant growth regulators (PGRs) and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase (ACCD) and to solubilize phosphorus. Accordingly, only one isolate, Streptomyces tubercidicus UAE1 (St), was selected based on its relative superiority in displaying multiple modes of action and in successfully colonizing mangrove tissues for 15 weeks. In the greenhouse experiments, plants treated with St and SWE significantly (p < 0.05) improved dry biomass by 40.2% and 55.1% in roots and 42.2% and 55.4% in shoots, respectively, compared to seawater-irrigated non-treated mangrove plants (control). However, St+SWE caused a greater significant (p < 0.05) increase in dry weight of roots (67.6%) and shoots (65.7%) than did control plants. Following the combined treatment of St+SWE, in planta PGR levels were found to be greatly enhanced over the non-treated control plants grown in non-SWE supplemented sediments, or plants inoculated with only St without the supplementation with SWE, or with non-inoculated plants grown in sediments supplied with SWE only. This was evident from the significant (p < 0.05) increases in the photosynthetic pigments and production of PGRs, as well as the reduction in the endogenous ACC levels of plant tissues compared to those in other treatments. Tissue nutrient contents of seedlings also increased by at least two-fold in St+SWE treatment as compared to control. Similar effects were observed on all growth parameters under natural open-field nursery conditions. Combining St with SWE not only stimulates plant growth but also potentially has additive effects on mangrove ecosystem productivity in nutrient-impoverished soils in the Arabian coastal areas. This report is the first in the field of marine agriculture that uses SWE as a nutrient base for actinobacteria capable of producing PGRs and ACCD.

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Section: Discussionsupporting

confidence: 72%

The Multifarious Endophytic Actinobacterial Isolate, Streptomyces tubercidicus UAE1, Combined With the Seaweed Biostimulant Further Promotes Growth of Avicennia marina

et al. 2022

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“…Based on these findings, the overall development and morphology of Photinia cuttings treated with Kelpak ® and Goteo ® were inhibited. Seaweed extracts often stimulate and accelerate cell division, elongation, differentiation and protein synthesis [37,92]; Makhaye et al [93] have verified the potential stimulatory effect of biostimulants (especially Kelpak ® ) on the germination of A. esculentus seeds. Seaweed extracts often stimulate and accelerate cell division, elongation, differentiation and protein synthesis [37,92]; Makhaye et al [93] have verified the potential stimulatory effect of biostimulants (especially Kelpak ® ) on the germination of A. esculentus seeds.…”

Section: Discussionmentioning

confidence: 99%

“…Seaweed extracts often stimulate and accelerate cell division, elongation, differentiation and protein synthesis [37,92]; Makhaye et al [93] have verified the potential stimulatory effect of biostimulants (especially Kelpak ® ) on the germination of A. esculentus seeds. Seaweed extracts often stimulate and accelerate cell division, elongation, differentiation and protein synthesis [37,92]; Makhaye et al [93] have verified the potential stimulatory effect of biostimulants (especially Kelpak ® ) on the germination of A. esculentus seeds. The application of biostimulants based on seaweed extracts in our experiment did not positively influence the number of leaves, chlorophyll index (SPAD) and leaf area index (Table 7).…”

Section: Discussionmentioning

confidence: 99%

Different Responses to Adventitious Rhizogenesis under Indole-3-Butyric Acid and Seaweed Extracts in Ornamental’s Cuttings: First Results in Photinia x fraseri ‘Red Robin’

et al. 2023

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Fraser’s photinia ‘Red Robin’ (Photinia x fraseri Dress, Rosaceae family) is an important primary ornamental landscaping species with optimal hedge or screen effects and low maintenance, but it is difficult to root when propagated by cuttings, although high concentrations of phytohormones are used to optimize rhizogenesis. To our knowledge, there is currently no feasible enhanced method for photinia vegetative propagation through stem cuttings, using seaweed extract-based biostimulants as root promoters. Given the economic importance of the species, this research aims to assess the effects of indole-3-butyric acid (IBA) and seaweed extract-based stimulators on the quality of photinia ‘Red Robin’ cuttings, in terms of rooting indicators and ground and aboveground agronomic features. The treatments applied were different concentrations of commercial rooting stimulators compared to an untreated control: C0: distilled water; Rhizopon AA: 1% IBA (R1); Kelpak®: 2 mL L−1 (K2); Kelpak®: 3 mL L−1 (K3); Goteo®: 2 mL L−1 (G2); Goteo®: 3 mL L−1 (G3). The first results showed different responses to adventitious rhizogenesis under IBA and both seaweed extract treatments. At 70 DAC (days after cutting), the seaweed extract stimulated the production of over 80% of cuttings with callus; at 240 DAC, the percentage of rooted cuttings treated under R1 was the highest = 34.3%; the worst results were obtained by both biostimulant treatments at the highest doses: K3 = 21.3% and G3 = 20.7%. Furthermore, R1 produced 3.07 roots per cutting, which was 50% higher than the average of all other treatments. The applications of Kelpak® and Goteo® biostimulants, at both concentrations, resulted in an inhibition of root length with values below the untreated control. Rooted cuttings under R1 showed the highest ground (0.35 g) and aboveground (0.47) dry value. Neither seaweed extract, Kelpak® or Goteo®, at different concentrations, improved both the ground and above-ground weights of rooted cutting, compared to the untreated control, indicating that these natural products are not suitable for Fraser’s photinia ‘Red Robin’ propagation using this methodology. The overall quality of cuttings in IBA treatment was the strongest, with 1%, being the optimum concentration. Further research must be conducted to propose effective agronomic protocols by investigating application methods, doses and number of applications, and to clarify the biochemical and molecular mechanisms of action of these seaweed extracts.

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“…and photosynthetic capacity of a plant. Further, they also enhance biotic and abiotic stress tolerance by activating genes responsible for antioxidant defense system, production of phenolics, enzymes, amino acids and organic acids ( Backer et al., 2018 ; Rouphael and Colla, 2018 ; Hamid et al., 2021 ; Aremu et al., 2022 ; Lin and Jones, 2022 ; Vocciante et al., 2022 ), but the exact functionality at cellular and biomolecular mechanisms are yet to be deciphered ( Lephatsi et al., 2021 ; Othibeng et al., 2022 ). To elucidate the mechanism of action of biostimulants on plants, combined potential of molecular tools, proteomics, transcriptomics and metabolomics have been harnessed by several researchers ( Franzoni et al., 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Physiological and molecular insight of microbial biostimulants for sustainable agriculture

Kaushal

Ali

Saini³

et al. 2023

Front. Plant Sci.

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Increased food production to cater the need of growing population is one of the major global challenges. Currently, agro-productivity is under threat due to shrinking arable land, increased anthropogenic activities and changes in the climate leading to frequent flash floods, prolonged droughts and sudden fluctuation of temperature. Further, warm climatic conditions increase disease and pest incidences, ultimately reducing crop yield. Hence, collaborated global efforts are required to adopt environmentally safe and sustainable agro practices to boost crop growth and productivity. Biostimulants appear as a promising means to improve growth of plants even under stressful conditions. Among various categories of biostimulants, microbial biostimulants are composed of microorganisms such as plant growth-promoting rhizobacteria (PGPR) and/or microbes which stimulate nutrient uptake, produce secondary metabolites, siderophores, hormones and organic acids, participate in nitrogen fixation, imparts stress tolerance, enhance crop quality and yield when applied to the plants. Though numerous studies convincingly elucidate the positive effects of PGPR-based biostimulants on plants, yet information is meagre regarding the mechanism of action and the key signaling pathways (plant hormone modulations, expression of pathogenesis-related proteins, antioxidants, osmolytes etc.) triggered by these biostimulants in plants. Hence, the present review focuses on the molecular pathways activated by PGPR based biostimulants in plants facing abiotic and biotic challenges. The review also analyses the common mechanisms modulated by these biostimulants in plants to combat abiotic and biotic stresses. Further, the review highlights the traits that have been modified through transgenic approach leading to physiological responses akin to the application of PGPR in the target plants.

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Influence of Commercial Seaweed Extract and Microbial Biostimulant on Growth, Yield, Phytochemical Content, and Nutritional Quality of Five Abelmoschus esculentus Genotypes

Cited by 9 publications

References 65 publications

The Multifarious Endophytic Actinobacterial Isolate, Streptomyces tubercidicus UAE1, Combined With the Seaweed Biostimulant Further Promotes Growth of Avicennia marina

The Multifarious Endophytic Actinobacterial Isolate, Streptomyces tubercidicus UAE1, Combined With the Seaweed Biostimulant Further Promotes Growth of Avicennia marina

Different Responses to Adventitious Rhizogenesis under Indole-3-Butyric Acid and Seaweed Extracts in Ornamental’s Cuttings: First Results in Photinia x fraseri ‘Red Robin’

Physiological and molecular insight of microbial biostimulants for sustainable agriculture

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