Trinexapac-Ethyl Causes Stimulatory Effect on the Initial Growth of Eucalyptus urograndis Clones

Bacha, Allan Lopes; Martins, Pedro de Figueiredo Rocha Barbosa; Carrega, Willians César; Alves, Pedro Luis da C. A.; Paula, Rinaldo César de

doi:10.5539/jas.v9n10p189

Cited by 4 publications

(10 citation statements)

References 16 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The latter is a co-substrate of dioxygenases catalyzing late steps in GA metabolism (Adams et al 1992;Rademacher 2000;Hedden and Sponsel 2015). As verified in some studies (Pires et al 2013;Correia and Villela 2015;Bacha et al 2017), there is no negative effect of low doses of this compound on eucalyptus plants.…”

Section: Introductionmentioning

confidence: 77%

“…Several authors define hormesis as a stimulatory effect resulting from the application of low doses of a substance that would be toxic in high quantities (Calabrese and Baldwin 2002;Belz and Duke 2014). This effect has already been observed in several plant species, including Eucalyptus urograndis and Eucalyptus grandis (Velini et al 2008;Pires et al 2013;Correia and Villela 2015;Bacha et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, these gains were not reflected in increases in growth and dry matter characteristics of eucalyptus (Table 1). Belz and Duke (2014) elucidate that several factors can influence the occurrence of hormesis resulting from the application of chemicals, e.g., species, clone, or cultivar used (Dusky et al 1985;McDonald et al 2001;Bacha et al 2017), stage of plant development (Carvalho et al 2013), environmental conditions (Belz and Cedergreen 2010), and the final evaluation point (Cedergreen et al 2009;Belz et al 2011), i.e., how long after exposure to the product is the assessment. Thus, this could be the reason for the difference observed between the results obtained in the present study and those reported by Pires et al (2013), which found gains of 19% in leaf area of E. urograndis sprayed with trinexapac-ethyl before planting of seedlings (methodology similar to the BP application time).…”

Section: Discussionmentioning

confidence: 99%

“…During BP application, the seedlings were sprayed with trinexapac-ethyl at doses of 30 and 60 g a.i.·ha −1 one day before planting. These rates represent, respectively, 10% and 20% of the commercial dose recommended for sugarcane and had previously been shown to have positive effects on eucalyptus (Bacha et al 2017 For the AP timing, the application occurred at 33 days after planting (DAP), and the same doses and application methodology as described above were used. At that time, the air temperature was 25.2°C and the relative humidity was 61.5%.…”

Section: Treatments Experimental Design and Trinexapac-ethyl Applicmentioning

confidence: 99%

“…Some studies suggest that the application of trinexapac-ethyl to eucalyptus seedlings may have a positive effect on plant growth, which can also be related to increases in photosynthetic parameters of eucalyptus (Pires et al 2013;Correia and Villela 2015;Bacha et al 2017). This phenomenon is known as hormesis and consists of a stimulatory effect resulting from the application of low doses of a substance that would be toxic in high doses (Calabrese and Baldwin 2002;Belz and Duke 2014).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Trinexapac-ethyl causes stimulatory effect on eucalyptus initial growth under nutritional deficiency

et al. 2018

Self Cite

View full text Add to dashboard Cite

Eucalyptus plants are sensitive to abiotic stresses in their initial growth, and nutritional deficiency is one of the most recurrent among them. Trinexapac-ethyl, which is a plant growth regulator, can positively affect eucalyptus, a response known as hormesis, possibly providing plants with greater tolerance to stress. The objective of this study was to evaluate the effect of trinexapac-ethyl at two application times, before planting (BP) or after planting (AP), in Eucalyptus urophylla under conditions of nutritional deficiency (NPK). Two experiments (one for each application time) were conducted simultaneously during 81 days after planting of eucalyptus in 15 L pots. The treatments consisted of three doses of trinexapac-ethyl (0, 30, and 60 g a.i.·ha−1) and four variations of nutrient supply: complete solution (NPK) and solutions without nitrogen (−N), without phosphorus (−P), and without potassium (−K). The variables of gas exchange, growth, and dry matter were evaluated. For both application times, trinexapac-ethyl had a positive effect on the root–shoot ratio of plants grown in −N and also positively affected some eucalyptus photosynthetic characteristics. In the AP application, the compound provided gains in height and dry matter, regardless of the nutrient supply. Under phosphorus deficiency, trinexapac-ethyl provided gains in total dry matter (BP) and leaf area (AP).

show abstract

Section: Introductionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Treatments Experimental Design and Trinexapac-ethyl Applicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Trinexapac-ethyl causes stimulatory effect on eucalyptus initial growth under nutritional deficiency

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

Influence of phosphorus fertilization on the response of pinus genotypes to glyphosate subdoses

Andrade

Bacha

Camargo³

et al. 2021

New Forests

View full text Add to dashboard Cite

Effect of Trinexapac-Ethyl, at Two Application Timings, on the Initial Development of Eucalyptus under Water Deficit

et al. 2019

View full text Add to dashboard Cite

Eucalyptus plants are sensitive to stress during their initial development, and water deficit is the most important one. Thus, the hormetic effect caused by the application of chemical products may be a factor that allows plants to tolerate such stresses. The objective of this study was to evaluate the effects of trinexapac-ethyl on the initial growth of Eucalyptus urophylla (Clone I-144), under water deficiency, at two application timings (before planting - BP; and after planting - AP). Two experiments were conducted simultaneously in a greenhouse for 74 days after planting (DAP) eucalyptus in 15 L pots. Treatments consisted of three trinexapac-ethyl doses (0.0, 30, and 60 g a.i. ha-1) and two water conditions (with and without water deficit). A complete randomized block design was used, in a 3 x 2 factorial arrangement, with five replications. At the BP application timing, trinexapac-ethyl was sprayed at 0 DAP, and at the AP timing, at 24 DAP. In both experiments, plant height, diameter, leaf area, dry matter, total relative chlorophyll content and gas-exchange were evaluated. There was a positive effect for the net CO2 assimilation rate at 27 and 40 DAP, for AP and BP, respectively. Eucalyptus plants, without water deficit, presented higher growth, regardless of the application timing. In conclusion, the application of trinexapac-ethyl before planting caused a positive effect on the height and diameter of eucalyptus; and the application timing influenced, in different ways, the evaluated characteristics, not having harmful effects on any of them.

show abstract

Trinexapac-Ethyl Causes Stimulatory Effect on the Initial Growth of Eucalyptus urograndis Clones

Cited by 4 publications

References 16 publications

Trinexapac-ethyl causes stimulatory effect on eucalyptus initial growth under nutritional deficiency

Trinexapac-ethyl causes stimulatory effect on eucalyptus initial growth under nutritional deficiency

Influence of phosphorus fertilization on the response of pinus genotypes to glyphosate subdoses

Effect of Trinexapac-Ethyl, at Two Application Timings, on the Initial Development of Eucalyptus under Water Deficit

Contact Info

Product

Resources

About