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Agronomy
Special Issues
Alleviation of Crop Stress Response by Application of Exogenous Substances
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Alleviation of Crop Stress Response by Application of Exogenous Substances

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Plant-Crop Biology and Biochemistry".

Deadline for manuscript submissions: closed (15 December 2024) | Viewed by 2664

Special Issue Editors

Dr. Cristian Merino-Gergichevich

E-Mail Website
Guest Editor
Department of Agricultural Production, Faculty of Agricultural Sciences and Environment, Universidad de La Frontera, Temuco 4811230, Chile
Interests: antioxidant performance; micronutrients; plant nutrition; annual and fruit crop nutrition
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Zlatko Svecnjak

E-Mail Website
Guest Editor
Department of Field Crops, Forage and Grassland, Faculty of Agriculture, University of Zagreb, Svetošimunska cesta 25, 10000 Zagreb, Croatia
Interests: annual crops production; forages; grasslands

Special Issue Information

Dear Colleagues,

In recent years, climate change, characterized frequently by erratic climate events, has become a stress factor for sustainable crop production. Facing these constraints and for crop adaptation, the exogenous application of substances such as biostimulants, phytohormones, growth regulators, amino acids, and osmoprotectants has gained increased interest from growers, particularly for those who produce perennial crops; however, successful applications have resulted in controversial experiences from an agronomical, physiological, biochemical, chemical, or molecular focus. The introduction of these substances will represent the complementation of agronomical management for crops and requires comprehensive studies focused on management, application, quality, utilization, and collateral responses to plant abiotic and biotic stress, as well as their interaction with the environment. In the context of this Special Issue, the alleviation of the crop stress response by the application of exogenous compounds, alongside the challenge of improving the productivity of major crops under the climate change scenario, will become the greatest challenge to agronomy in the future.

Dr. Cristian Merino-Gergichevich
Prof. Dr. Zlatko Svecnjak
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Agronomy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • abiotic stress
  • agronomy
  • antioxidant mechanism
  • biostimulants
  • biotic stress
  • growth regulators
  • sustainable crop production
  • physiology
  • phytohormones

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Published Papers (2 papers)

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Research

28 pages, 5123 KiB  
Article
Enhancing the Photosynthetic and Yield Performance of Rice in Saline Soil by Foliar-Applying Cost-Effective Compounds as Sources of Carbon Dioxide and Potassium
by Bassiouni A. Zayed, Salah El-Hendawy, Yuncai Hu, Amira M. Okasha, Mohamed M. Abdelhamed, Hasnaa A. Ghazy, Samah M. Aamer, Dalia E. El-Sharnobi, Saied A. Soltan, Abdelfatah A. Gaber and Salah Elsayed
Agronomy 2024, 14(12), 2850; https://doi.org/10.3390/agronomy14122850 - 28 Nov 2024
Cited by 2 | Viewed by 799
Abstract
Although rice is highly sensitive to salinity, it is considered one of the best crops to grow in salt-affected mudflat soils to alleviate the salinity problem. Applying chemical compounds for an increase in leaf CO2 and nutrient levels can help mitigate the [...] Read more.
Although rice is highly sensitive to salinity, it is considered one of the best crops to grow in salt-affected mudflat soils to alleviate the salinity problem. Applying chemical compounds for an increase in leaf CO2 and nutrient levels can help mitigate the negative impact of salinity on plants in a cost-effective manner. To identify the benefits of using lithovit (Liv), ethanol (Eth), and potassium carbonate (KC) as a source of CO2 and K to enhance rice production in salt-affected soils, a field study was conducted to assess the effects of these compounds on the agro-physiological parameters of two rice genotypes (Giza178 and Giza179) in saline soils. The compounds were applied as a foliar spray at a concentration of 30 mM each before and after the heading growth stage. The results indicated that the genotype, application time, compounds, and their potential two-way interactions significantly influenced all agro-physiological parameters, with only a few exceptions. The genotype Giza 179 exhibited higher pigment contents, photosynthetic capacity, relative water content (RWC), grain yield, and most yield components compared to Giza 178, with increases ranging from 2.1% to 37.9%. Foliar application of different compounds resulted in a 9.7–37.9% increase in various parameters and a 34.6–43.2% decrease in the number of unfilled grains (NUFG) per panicle compared to untreated treatment. Foliar application of different compounds before heading resulted in an increase in various parameters by 4.8–16.1% and a decrease in the NUFG per panicle by 22.9% compared to those applied after heading. Heatmap clustering analysis revealed that foliar application of Liv before heading was the most effective treatment in enhancing various parameters for both genotypes and mitigating the negative effects of salinity stress on the NUFG. This was followed by Eth and KC before heading for Giza 179. Applying Eth and KC to the leaves after heading had a moderate positive impact on most parameters for Giza 179, outperforming the application after heading for Giza 178. Overall, our findings indicate that spraying readily available compounds that elevate CO2 and K levels in rice leaves can help alleviate the negative impacts of salt stress and improve rice production in salt-affected soils in a cost-effective manner. Full article
(This article belongs to the Special Issue Alleviation of Crop Stress Response by Application of Exogenous Substances)
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18 pages, 1905 KiB  
Article
Optimization of Sargassum bovianum Extraction Techniques for Germination of Wheat, Canola, and Corn Under Different Salinity Stress
by Mehdi Derafshi, Akbar Hassani, Setareh Amanifar, Mohammad Babaakbari, Narges Hematimatin, Behnam Asgari Lajayer, Tess Astatkie and G. W. Price
Agronomy 2024, 14(11), 2646; https://doi.org/10.3390/agronomy14112646 - 10 Nov 2024
Cited by 2 | Viewed by 1301
Abstract
Seaweeds are a cheap, eco-friendly, and rich source of plant growth stimulators that can mitigate the adverse effects of salinity stress. This study examined the impact of Sargassum bovianum extracts obtained through different techniques using pressure, heat, and microwave radiations on the germination [...] Read more.
Seaweeds are a cheap, eco-friendly, and rich source of plant growth stimulators that can mitigate the adverse effects of salinity stress. This study examined the impact of Sargassum bovianum extracts obtained through different techniques using pressure, heat, and microwave radiations on the germination and growth of wheat, corn, and canola seeds under varying salinity levels (500, 3500, and 6500 µS cm−1). The findings showed that pressure, microwave, and acidic extraction methods were the most effective in extracting polysaccharides, alginate, and nutrients from S. bovianum. Seaweed extract significantly improved the mean germination time (MGT) and germination index (GI) of wheat under high salinity stress and had a positive effect on wheat plumule length (PL) and germination percentage (GP). However, seaweed extract had no significant impact on canola seeds in salinity stress, except for improved canola PL. The PL and seedling vigor index (SVI) of corn were enhanced in low salinity levels, but most treatments reduced PL and SVI in high salinity. This study suggests that using heat, pressure, and microwave techniques for seaweed extraction results in higher polysaccharides and alginate content, leading to improved germination and plant growth, particularly in wheat and canola. These findings can help growers optimize the germination and growth of these important crops. Full article
(This article belongs to the Special Issue Alleviation of Crop Stress Response by Application of Exogenous Substances)
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