Interactive Effects of Ascophyllum nodosum Seaweed Extract and Silicon on Growth, Fruit Yield and Quality, and Water Productivity of Tomato under Water Stress

Ahmed, M.; Ullah, Hayat; Attia, Ahmed; Tisarum, Rujira; Cha–um, Suriyan; Datta, Avishek

doi:10.1007/s12633-022-02180-x

Cited by 11 publications

(5 citation statements)

References 79 publications

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“…Furthermore, an animal protein-based biostimulant obtained by enzymatic hydrolysis boosted antioxidant protection under water stress [59]. Extracts of the seaweed Ascophyllum nodosum combined with silicon applied to tomato plants under moderate drought (75% field capacity) improved fruit yield to the level of the optimally irrigated controls [60]. In another study, treatments with a seaweed biostimulant (Ascophyllum nodosum and Laminaria digitata) and yeast extracts reduced abscisic acid, malondialdehyde, and proline contents and the activity of ROS scavenging enzymes compared to untreated plants [36].…”

Section: Discussionmentioning

confidence: 99%

Antioxidant Responses of Water-Stressed Cherry Tomato Plants to Natural Biostimulants

Gil-Ortiz,

Naranjo,

Atares

et al. 2023

Agronomy

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Biostimulants’ application to plants can reduce the damage caused by abiotic factors such as drought or salinity and improve crop yield under these stressful conditions. In this work, several biostimulants, namely Terrabion Aminovit® (a commercial product based on amino acids), potassium fulvate, humic acids, and a seaweed extract, were applied to cherry tomato plants using fertigation at two doses of 0.2 and 1.0 g L−1. The plants were then subjected to a water stress treatment by completely withholding irrigation for 12 days. After the treatments, all plants were harvested to determine several growth and biochemical parameters. Pre-treatment with all biostimulants protected the tomato plants against dehydration, as indicated by a significant increase in leaf water content compared to the non-irrigated controls. Leaf fresh weight and root water content also increased, except in the plants treated with humic acids, by about 2 fold in plants pre-treated with Terrabion Aminovit® and 1.5 fold in the presence of potassium fulvate and the seaweed extract. The water stress treatment caused a significant increase in leaf proline content, up to 113.6 μmol g−1 DW, approximately 18 fold higher than in well-irrigated control plants; this value was significantly lower in Terrabion Aminovit® pre-treated plants but even higher, ca. 180 μmol g−1 DW, in those treated previously with the seaweed extract. These results indicate that proline is a suitable water stress biomarker in tomatoes and that the biostimulants probably differ in their mode of action, suggesting that the effect of the seaweed extract is mediated by proline accumulation. A significant activation of antioxidant enzymes, namely superoxide dismutase, ascorbate peroxidase, and glutathione reductase, was also observed in water-stressed plants; application of the biostimulants resulted in all cases, in a significant reduction in the specific activities of the three enzymes, indicating reduced levels of drought-induced oxidative stress in the plants. We conclude that applying these biostimulants, particularly Terrabion Aminovit®, may help minimise the adverse effects of water stress on tomatoes by maintaining turgor and improving growth through mechanisms still unknown but which appear to involve, at least in part, enhancing the plants’ antioxidant defence responses.

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Section: Discussionmentioning

confidence: 99%

Antioxidant Responses of Water-Stressed Cherry Tomato Plants to Natural Biostimulants

Gil-Ortiz,

Naranjo,

Atares

et al. 2023

Agronomy

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“…Ahmed et al (2022) also recorded increased proline content in seaweed-treated tomato plants under water stress. A signi cant increase in glycine betaine in seaweed-treated tomato plants was also seen here.…”

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confidence: 80%

Ascophyllum nodosum extract treatment maintains the growth of tomato (Solanum lycopersicum L.) plants during temporary drought stress

Alí

Farrell

Ramsubhag

et al. 2023

Preprint

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Abiotic stress, especially drought stress, is one of the principal constraints of crop productivity and is expected to worsen with climate change in the near future. This warrants the development of new technologies to decrease the impact of drought on crop productivity. Biostimulants made from seaweed extracts are one of the relatively new biological based inputs that can help mitigate the negative effects of abiotic stress on plants by enhancing growth, development, and stress tolerance. The current study evaluates the impact of Ascophyllum nodosum extract on tomato plants grown under different levels of water stress. Greenhouse studies were conducted to assess the effect of foliar spray (0.5%) of the extract on stomatal conductance, photosynthetic health, chlorophyll content, and biomass, for plants grown at moisture levels viz. 100%, 50%, and 25% of field capacity. A field study was also conducted with irrigation maintained at 100% and 25%. Additionally, the expression levels of marker genes associated with drought tolerance were evaluated using qPCR studies for Metacaspase 1 (LeMCA1), Non-specific lipid-transfer protein 2 (Itpg2), Late embryogenesis abundant protein (LEA) and Delta 1-pyrroline-5- carboxylate synthetase (P5CS) genes. Assays were also conducted for the osmolytes including proline and glycine betaine. Furthermore, the activities of antioxidant defense enzymes were evaluated for superoxide dismutase- SOD, catalase- CAT, peroxidase- POX, ascorbate peroxidase- APX and guaiacol peroxidase- GPX. The results of the greenhouse study indicated higher stomatal conductance, chlorophyll content, and Fv/Fm in stressed plants that were foliar sprayed with the A. nodosum extract. Seaweed extract-treated plants under water-stress conditions also had significantly greater shoot and root dry weights compared to control plants. The relative expression levels of the marker genes were also significantly increased in sprayed plants compared to control plants along with increased antioxidant enzymes activities and osmolyte contents. The field experiments revealed that seaweed extract-treated plants had significantly higher plant height and total yield under reduced irrigation compared to control plants, although both parameters remained lower than those seen under full irrigation. This study has produced encouraging findings on the application of Ascophyllum nodosum extract in crop systems, indicating that it may have a positive role in mitigating the effects of drought stress.

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“…The grouping of 16 rice genotypes, based on their morphophysiological responses to Fe toxicity, also indicated conspicuous polarization of tolerant and sensitive genotypes. PCA-based clustering has been previously utilized in studies by Nugraha et al (2016a,b), Pawar et al (2017), Dziwornu et al (2018), Theerawitaya et al (2022), andAhmed et al (2023) for identification of sensitive and tolerant genotypes. Using the index sum and PCA the sensitive genotypes could be separated clearly from the tolerant genotypes with, the moderately responding genotypes falling in between.…”

Section: Discussionmentioning

confidence: 99%

Implications of tolerance to iron toxicity on root system architecture changes in rice (Oryza sativa L.)

Sonu,

Nandakumar,

Singh

et al. 2024

Front. Sustain. Food Syst.

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IntroductionToxicity due to excess soil iron (Fe) is a significant concern for rice cultivation in lowland areas with acidic soils. Toxic levels of Fe adversely affect plant growth by disrupting the absorption of essential macronutrients, and by causing cellular damage. To understand the responses to excess Fe, particularly on seedling root system, this study evaluated rice genotypes under varying Fe levels.MethodsSixteen diverse rice genotypes were hydroponically screened under induced Fe levels, ranging from normal to excess. Morphological and root system characteristics were observed. The onset of leaf bronzing was monitored to identify the toxic response to the excess Fe. Additionally, agronomic and root characteristics were measured to classify genotypes into tolerant and sensitive categories by computing a response stability index.ResultsOur results revealed that 460 ppm of Fe in the nutrient solution served as a critical threshold for screening genotypes during the seedling stage. Fe toxicity significantly affected root system traits, emphasizing the consequential impact on aerial biomass and nutrient deprivation. To classify genotypes into tolerant and sensitive categories, leaf bronzing score was used as a major indicator of Fe stress. However, the response stability index provided a robust basis for classification for the growth performance. Apart from the established tolerant varieties, we could identify a previously unrecognized tolerant variety, ILS 12–5 in this study. Some of the popular mega varieties, including BPT 5204 and Pusa 44, were found to be highly sensitive.DiscussionOur findings suggest that root system damage, particularly in root length, surface area, and root volume, is the key factor contributing to the sensitivity responses under Fe toxicity. Tolerant genotypes were found to retain more healthy roots than the sensitive ones. Fe exclusion, by reducing Fe2+ uptake, may be a major mechanism for tolerance among these genotypes. Further field evaluations are necessary to confirm the behavior of identified tolerant and sensitive lines under natural conditions. Insights from the study provide potential scope for enhancement of tolerance through breeding programs as well as throw light on the role root system in conferring tolerance.

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Interactive Effects of Ascophyllum nodosum Seaweed Extract and Silicon on Growth, Fruit Yield and Quality, and Water Productivity of Tomato under Water Stress

Cited by 11 publications

References 79 publications

Antioxidant Responses of Water-Stressed Cherry Tomato Plants to Natural Biostimulants

Antioxidant Responses of Water-Stressed Cherry Tomato Plants to Natural Biostimulants

Ascophyllum nodosum extract treatment maintains the growth of tomato (Solanum lycopersicum L.) plants during temporary drought stress

Implications of tolerance to iron toxicity on root system architecture changes in rice (Oryza sativa L.)

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