Plant physiological and molecular responses triggered by humic based biostimulants - A way forward to sustainable agriculture

Rathor, Pramod; Gorim, Linda Yuya; Thilakarathna, Malinda S.

doi:10.1007/s11104-023-06156-7

Cited by 9 publications

(10 citation statements)

References 258 publications

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“…One of the classical responses of HPs on plant growth is alterations in root architecture through activation of the auxin signal transduction pathway and enhanced root growth (Canellas et al., 2002; Elmongy et al., 2020; Olaetxea et al., 2018; Rathor et al., 2023; Tahiri et al., 2016; Wang et al., 2017; Zandonadi et al., 2007). Furthermore, the macrostructure of HPs contains indole‐3‐acetic‐acid (IAA) and other similar classes of compounds providing IAA‐like activities (Canellas et al., 2002; Muscolo et al., 1998; Russell et al., 2006; Scaglia et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

“…The direct effects of HPs on plant growth and development are associated with different bioactive components such as organic functional groups, amino acids, and phytohormone‐like compounds that are enclosed in macromolecular structure. These bioactive compounds activate the signal transduction pathways, reprogramming the expression of a large subset of genes involved in plant growth and development processes such as nutrient uptake and assimilation, photosynthesis, respiration, and primary and secondary metabolism (Canellas & Olivares, 2014; Jannin et al., 2012; Nardi et al., 2017, 2018; Rathor et al., 2023; Zanin et al., 2018). Indirect effects involve the soil environment where HPs improve soil physiochemical and biological properties such as soil structure, texture, water retention capacity, soil pH, enhanced nutrient availability due to the ability of HPs to form complexes with ions that prevent leaching losses, and alterations in microbial abundance and biodiversity (Dawood et al., 2019; García, de Souza, et al., 2016a; García‐Mina et al., 2004; Gerke, 2021; Lumactud et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

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Humalite enhances the growth, grain yield, and protein content of wheat by improving soil nitrogen availability and nutrient uptake

Rathor,

Rouleau,

Gorim

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundThe application of synthetic chemical inputs in current agricultural practices has significantly increased crop production, but their use has caused severe negative consequences on the environment. Humalite is an organic soil amendment that is rich in humic acid and found in large deposits in southern Alberta, Canada. Humic products can enhance nutrient uptake and assimilation in plants by reducing nutrient losses and enhancing bioavailability in the soil.AimHere, we evaluated the effects of different humalite rates in the presence of nitrogen, phosphorus, potassium (NPK) at recommended rates on soil nitrogen availability, wheat growth, grain yield, seed nutritional quality, and nitrogen use efficiency (NUE) under controlled environmental conditions.MethodsA series of studies were conducted by applying five different rates of humalite (0, 200, 400, 800, and 1600 kg ha−1) with NPK at recommended rates. Soil nitrogen availability and shoot and root growth parameters were recorded at flowering stage. NUE was calculated based on the grain yield at maturity stage.ResultsPlants grown in the presence of humalite augmented root morphological parameters (root length, volume, and surface area), plant biomass (shoot and root), and nutrient uptake (N, P, K, and S) compared to the plants supplied with recommended fertilizer alone. Furthermore, humalite application significantly increased grain yield (14%–19%), seed protein content (23%–30%), and NUE (14%–60%) compared to the fertilizer application alone.ConclusionThese findings suggest that humalite can be used as an organic soil amendment to reduce synthetic fertilizer application and improve plant growth and yield while enhancing fertilizer use efficiency.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Humalite enhances the growth, grain yield, and protein content of wheat by improving soil nitrogen availability and nutrient uptake

Rathor,

Rouleau,

Gorim

et al. 2024

J. Plant Nutr. Soil Sci.

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“…Similar to the above method, 15 N and total N% were analyzed [34] and the percentage of nitrogen derived from the atmosphere (%Ndfa) in red clover was calculated according to the isotope dilution technique using the following formula [38]: %Ndfa = 1 − atom% 15 N excess (redclover) atom% 15 N excess (timothygrass) × 100…”

Section: Determination Of Nitrogen Fixation-related Parametersmentioning

confidence: 99%

“…Due to the adverse impacts of drought stress on plant growth and development, the agriculture sector, including forage production, will be significantly influenced by these alterations [12,13]. Drought stress impedes plant growth through nutrient imbalance, production and accumulation of reactive oxygen species (ROS), and inactivation of enzymes that are involved in different metabolic pathways of plant growth and development [14][15][16]. The duration and severity of drought stress determine plant survival and crop yield losses [17].…”

Section: Introductionmentioning

confidence: 99%

Effects of Drought Stress on Red Clover-Grass Mixed Stands Compared to Grass Monoculture Stands in Nitrogen-Deficient Systems

De Silva,

Rathor,

Poudel

et al. 2023

Nitrogen

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Drought stress is one of the major abiotic stress factors affecting forage production; thus, it is essential to obtain a better understanding of how forage responds to drought. The main objective of this study was to evaluate how legume-grass mixed forage stands respond to drought stress when compared to grass monoculture. A greenhouse pot experiment was conducted using a red clover (Trifolium pratense L.)—timothy grass (Phleum pratense L.) mixed stand and a timothy monoculture stand, where plants were subjected to severe drought (20% field capacity—FC), moderate drought (40% FC), and well-watered (80% FC) conditions for four weeks and subsequently allowed to recover for another four weeks by adjusting moisture back to 80% FC. Both moderate and severe droughts significantly reduced the shoot biomass of the mixed stand, while no difference was exhibited in the timothy monoculture. The shoot biomass and nitrogen fixation capacity of red clover were reduced under drought stress. However, red clover plants subjected to moderate drought were able to recover shoot growth and nitrogen fixation capacity during the recovery phase, allowing more biologically fixed nitrogen and shoot nitrogen production similar to the plants growing under well-watered conditions. Overall, the results demonstrate that the inclusion of legumes in forage mixtures enhances resilience to moderate drought stress.

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“…Adding a plant biostimulant to the substrate could enhance seed germination and further the growth and development of plantlets [ 28 ]. Plant biostimulants include well-known products such as chitosan, humic and fulvic acid (humic substances), and protein hydrolysates, among others [ 29 , 30 ]. Chitosan is a natural polysaccharide formed chemically by glucosamine units β-(1-4) linked.…”

Section: Introductionmentioning

confidence: 99%

Extracted Eucalyptus globulus Bark Fiber as a Potential Substrate for Pinus radiata and Quillaja saponaria Germination

Ferrer-Villasmil,

Fuentealba,

Reyes-Contreras

et al. 2024

Plants

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This study aimed to explore alternative substrates for growing forest species using eucalyptus bark. It evaluated the potential of extracted Eucalyptus globulus fiber bark as a substitute for commercial growing media such as coconut fiber, moss, peat, and compost pine. We determined the physicochemical parameters of the growing media, the germination rate, and the mean fresh and dry weights of seedlings. We used the Munoo-Liisa Vitality Index (MLVI) test to evaluate the phytotoxicity of the bark alone and when mixed with commercial substrates. Generally, the best mixture for seed growth was 75% extracted eucalyptus bark fiber and 25% commercial substrates. In particular, the 75E-25P (peat) mixture is a promising substitute for seedling growth of Pinus radiata, achieving up to 3-times higher MLVI than the control peat alone. For Quillaja saponaria, the best growth substrate was the 50E-50C (coconut fiber) mixture, which had the most significant MLVI values (127%). We added chitosan and alginate-encapsulated fulvic acid phytostimulants to improve the performance of the substrate mixtures. The fulvic acid, encapsulated or not, significantly improved MLVI values in Q. saponaria species and P. radiata in concentrations between 0.05 and 0.1% w/v. This study suggests that mixtures with higher levels of extracted fiber are suitable for growing forest species, thus promoting the application of circular economy principles in forestry.

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Plant physiological and molecular responses triggered by humic based biostimulants - A way forward to sustainable agriculture

Cited by 9 publications

References 258 publications

Humalite enhances the growth, grain yield, and protein content of wheat by improving soil nitrogen availability and nutrient uptake

Humalite enhances the growth, grain yield, and protein content of wheat by improving soil nitrogen availability and nutrient uptake

Effects of Drought Stress on Red Clover-Grass Mixed Stands Compared to Grass Monoculture Stands in Nitrogen-Deficient Systems

Extracted Eucalyptus globulus Bark Fiber as a Potential Substrate for Pinus radiata and Quillaja saponaria Germination

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