Chemical composition and physiological quality of wheat seeds with the application of trinexapac-ethyl, a plant growth regulator

Abstract

This study evaluated the effect of the plant growth regulator trinexapac-ethyl on chemical composition and physiological quality of wheat seeds produced under fertilization for high yield potential. The experiment was performed under completely randomized design with five treatments (0; 200; 400; 600; 800 mL ha-1 of the commercial product Moddus ®) and four repetitions. The plant growth regulator was applied at elongation via foliar spraying. Seeds were harvested at the end of crop cycle. Variables evaluated were 1000 seeds weight, germination and first count of germination, speed of germination index, seedling dry matter, electrical conductivity, accelerated ageing and the contents of total soluble sugars, starch, amino acids and proteins. The first count of germination increased until the higher dose. Electrical conductivity after three hours of imbibition reduced at the doses of 600 mL ha-1 and 800 mL ha-1 , indicating greater seed physiological quality. Starch showed a trend of increase until the dose of 448 mL ha-1 ; amino acids until the dose of 243 mL ha-1 and protein until the dose of 417 mL ha-1. The content of total soluble sugars decreased with the increasing dose of the plant growth regulator. Therefore, wheat seeds produced from plants in which trinexapac-ethyl is applied present higher vigor and greater contents of starch, protein and amino acids, but lower content of total soluble sugars. Our results demonstrate that trinexapac-ethyl can be used for wheat management in seed production fields in the recommended dose (400 mL ha-1) with benefits in seed quality and composition.

Agronomic traits of white oat treated with the growth regulator trinexapac-ethyl

“…This demonstrates that TE indirectly, by reducing plant lodging, contributes so that the TGW characteristic is not drastically reduced by the exposure of panicles to the soil. Koch et al (2017b), working with different wheat cultivars, verified a positive influence of the regulator on the thousand grain weight, vigor and starch contents in seeds.…”

Exogenously Applied Trinexapac-ethyl Improves Photosynthetic Pigments, Water Relations, Osmoregulation and Antioxidants Defense Mechanism in Wheat under Salt Stress

“…It can also be related to stress tolerance induction by TE application through slow growth rate and improved osmotic adjustment (Stier and Rogers 2001). Osmotic adjustment is a physiological phenomenon associated with accumulation of solutes and inorganic ions which leads to improved survival rate of plants under stress conditions (Elansarya and Salem 2015;Koch et al 2017). Proline contents, soluble protein and soluble sugars can be regarded as osmolites used for osmotic adjustment.…”

Mode of physiological activity of acylcyclohexadione retardants

“…Wheat seedlings under salt stress and trinexapac-ethyl treatment had increased antioxidant activity of enzymes (superoxide dismutase, catalase, peroxidase, ascorbate peroxidase) (Sattar et al, 2019), probably due to the lower content of malonic dialdehyde (Chen et al, 2009). Trinexapac-ethyl promotes the formation of osmotic adaptation, a phenomenon associated with the accumulation of soluble substances and inorganic ions, which lead to increased survival of plants under salt stress (Elansarya & Salem, 2015;Koch et al, 2017b).…”

“…Trinesapacethyl, which is used in spraying the leaves, promotes the accumulation of fresh and dry biomass, pigments (chlorophyll and carotenoids) in the lawn grass (Sakr, 2009), increases the content of proline and the activity of enzymes (superoxide dismutase, catalase, peroxoroxidase) in wheat shoots under salt stress (Sattar et al, 2019) and in drought, reduces the amount of malonic aldehyde (Sheikh Mohammadi et al, 2016), reducing oxidative damage to cell membranes. It also promotes the formation of osmotic adaptation, a phenomenon associated with the accumulation of soluble substances and inorganic ions, which lead to increased plant survival under salt stress (Elansarya & Salem, 2015;Koch et al, 2017b).…”

“…The use of growth inhibitors can increase grain yield not only by reducing lodging, but also by increasing the absorption of solar radiation, changing stem diameter, leaf size and stimulating root growth (Pricinotto et al, 2015), as well as erectility of plants and leaves (Virych et al, 2012). Treatment of trinexapac-ethyl wheat plants does not have a negative effect on the chemical composition, germination and energy of seed germination and the emergence of seedlings (Koch et al, 2017a(Koch et al, , 2017b. It was found that the use of trinexapac-ethyl reduces the negative impact on wheat seedlings of salt stress by improving growth, water metabolism, chlorophyll content (Sattar et al, 2019).…”