Effects of Triacontanol and Light on Stomatal and Photochemical Responses in Solanum lycopersicum L.

Ramos-Zambrano, Emilia; Juárez-Yáñez, Tomás Ernesto; Tapia‐Maruri, Daniel; Camacho-Díaz, Brenda Hildeliza; Jiménez–Aparicio, Antonio Ruperto; Martínez-Ayala, Alma Leticia

doi:10.1007/s00344-020-10262-6

Cited by 7 publications

(10 citation statements)

References 55 publications

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“…Triacontanol (TRIA) is a promising plant growth regulator, as it plays an active role in the upregulation of major physiological activities required in different stages of plant growth [50,51]. In the present study, the priming of rice grains with TRIA (35 ppm) increased the fresh and dry weights of the shoots and roots of rice grown under wellwatered conditions (Figure 1a,b) compared with plants exposed to drought stress.…”

Section: Discussionsupporting

confidence: 46%

Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress

Alharbi

Abdulmajeed

Hassan

2021

Genes

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To assess the effect of triacontanol (TRIA) on rice plants grown under normal or drought conditions, rice seeds were presoaked in TRIA (35 ppm) for two hours. After 20 days of sowing, rice seedlings developed from TRIA-treated or untreated seeds were subjected to drought stress. After 10 days of plant exposure to drought stress, data of major growth attributes and the content of photosynthetic pigments were recorded. Moreover, the effect of drought stress on stomatal conductance and the photochemical efficiency of PSII (Fv/Fm) were followed. The data obtained indicated that the species of rice (Oryza sativa L.) cultivar Giza 177 under investigation was sensitive to drought stress where there were significant decreases in the fresh and dry weights of shoots and roots and in stomatal conductance, as well as in the content of chlorophyll a, chlorophyll b, and carotenoids. Seed priming with TRIA enhanced both growth and acquired plant tolerance to drought stress. Thus, TRIA via the enhancement of stomatal conductance through the regulation of stomatal closure, the rate of water loss, ABA metabolism, the accumulation of osmolytes, and the regulation of aquaporins genes improved the water status of plants grown under water scarcity. Moreover, TRIA via increasing the content of free amino acids and sugars under drought stress may increase the chance of plant tissues to retain more water under scarcity conditions.

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Section: Discussionsupporting

confidence: 46%

Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress

Alharbi

Abdulmajeed

Hassan

2021

Genes

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“…It has been studied in different species, such as tomato, sweet pepper, sugar beet, cotton, tobacco, potato, fruit crops, etc., and these studies have shown that TRIA can increase the dry and fresh weight, the height of the plant, and branch, stem and root length, as well as the yield of the fruit or seed [1,32,33]. Regarding physiological parameters, it has been determined that TRIA causes increases in the chlorophyll content in leaves, the photosynthetic rate, nitrogen fixation, enzymatic activity, and nutrient uptake, as well as stimulating the production of secondary metabolites and stomatal conductance [34]. Also, increases in the contents of nitrogen, phosphorus, and potassium have been reported, as well as of phenols, flavonoids, sugars, and proteins [35].…”

Section: Applications As Growth Promotermentioning

confidence: 99%

“…However, TRIA not only presents effects such as growth promotion in plants but also in cyanobacteria, improving their biomass, photosynthesis, photorespiration, and chlorophyll, and protein content, which in turn, cause an increase in Fatty Acid Methyl Ester (FAME) yields, which is of particular interest for biodiesel production and in the removal of pollutant compounds resulting from the increase in biomass of cyanobacteria [2]. Photosynthesis is one of the main processes stimulated by the exogenous application of TRIA, increasing parameters related to the efficiency of excitation capture by the PSII reaction centers (Fv/Fm) [37], the minimum fluorescence (F0), the maximum fluorescence (Fm), the light efficiency of the electron transport of the PSII (PSII) and the photochemical quenching (qP), and decreasing the Non-photochemical Quenching (NQP) [34,37] and chlorophyll content, even under stress conditions, saline stress, cooling and water stress [1,32,35]. Kathuria et al demonstrated that TRIA hinders the activity of chlorophyllase but does not enhance the biosynthesis of chlorophyll [38].…”

Section: Applications As Growth Promotermentioning

confidence: 99%

“…Kathuria et al demonstrated that TRIA hinders the activity of chlorophyllase but does not enhance the biosynthesis of chlorophyll [38]. Other aspect are changes of the fluidity of the chloroplast membrane and alterations in the dynamic properties of the protoplast [39], as well as the increase in the number of chloroplasts [34] and likely a better development of the thylakoid grana. Due to the structure of TRIA, a 30-carbon aliphatic chain with low solubility, it is not able to cross the plasma membrane, which is the first contact barrier for any plant growth promoter.…”

Section: Applications As Growth Promotermentioning

confidence: 99%

“…TRIA also inhibits the effect of ABA [40], which, together with JA, is a phytohormone involved in stomatal stress closure. Recently, stomatal regulation and inhibition of stomatal closure by ABA through TRIA application was reported [34].…”

Section: Applications As Growth Promotermentioning

confidence: 99%

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Main Mechanisms of Action of Policosanol in Animal and Plant Cells

Romero-Martínez¹,

Ramos-Zambrano²,

Osorio-Ruiz³

et al. 2021

Int j pharm res allied sci

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Policosanol is a promising compound that can be used in various industries. In the pharmaceutical industry, policosanol and, specifically, triacontanol, octacosanol, and hexacosanol have presented biological activity against several diseases, especially those related to inflammation and hypercholesterolaemia. On the other hand, triacontanol is used as a growth promoter in a wide variety of plants and crops of economic importance, even in microalgal culture, in either its pure form or in policosanol extracts. In this review, the most relevant references to the bioactivities of policosanol in plants and animal cells are collected to compare the different mechanisms of action. Analyzing this in detail allows us to ask new research questions. The PubMed and Redalyc database were used for article search under the following keys terms: policosanol, inflammatory mechanisms, triacontanol, cellular absorption, photosynthesis and photoinhibition. Policosanol interferes with the progression of the NF-κB and MAPK signaling pathway involved in the inflammation process. The cholesterol-lowering effect of policosanol is due to the inhibition of cholesterol synthesis in the liver, through the indirect inactivation of HMG-CoA reductase. Triacontanol improves the growth and the biochemical and physiological parameters of plants and the response to stress conditions that is related mainly to photosynthetic activity. Interestingly, octacosanol demonstrates an inhibitory activity on the effect of triacontanol in plants, a response not reported in human cells, as well as other differential aspects of the mechanisms of action in the cells of plants and animals that are interesting to analyze.

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The Impact of Triacontanol Spraying and the Addition of Humic Acid on the Vegetative and Root Development Parameters of Pyrus cimmunis L. Cv. Le-Conte Pear Seedlings

Mahdi,

Saleh

2024

IOP Conf. Ser.: Earth Environ. Sci.

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In 2022, researchers at the College of Agriculture, University of Anbar, studied the effects of triacontanol foliar spraying at 0, 25, 50, and 100 mg L-1 (T0, T1, T2 and T3 respectively) and ground humic acid addition at 0, 25, and 50 ml L-1 (H0, H1 and H2 respectively) on various aspects of CV. Le-conte pear seedlings’ vegetative and root growth. T3 treatment resulted in the highest rate of increase in plant height (35.50 cm), root length (20.55 cm), number of branches (7.44 branch seedling-1), number of lateral roots (5.33 root seedling-1) and chlorophyll content (109.32 mg gm-1 fresh weight), among other treatments. The results demonstrated that there were significant differences between the treatments. When treated with water (50 ml L-1), humic acid significantly outperformed other treatments in terms of plant height (35.17 cm), root length (20.08 cm), number of lateral roots (5.03), number of lateral branches (8.66 branch seedlings-1), and chlorophyll content in leaves (108.35 mg gm-1 fresh weight), according to the study. However, T3H2 therapy was superior in every attribute examined when the two research parameters were considered together.

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Effects of Triacontanol and Light on Stomatal and Photochemical Responses in Solanum lycopersicum L.

Cited by 7 publications

References 55 publications

Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress

Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress

Main Mechanisms of Action of Policosanol in Animal and Plant Cells

The Impact of Triacontanol Spraying and the Addition of Humic Acid on the Vegetative and Root Development Parameters of Pyrus cimmunis L. Cv. Le-Conte Pear Seedlings

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