Winter cereal responses to dose and application timing of trinexapac‐ethyl

Subedi, Maya; Karimi, Rouhollah; Wang, Zhijie; Graf, R. J.; Mohr, Ramona M.; O’Donovan, John T.; Brandt, S.A.; Beres, Brian L.

doi:10.1002/csc2.20472

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…The variation between genotypes found in this study for the variables was also reported by Subedi et al (2021), where they evaluated the effects of TE on the agronomic characters of winter cereal species, reporting that although the effects were verified in all cultivars of the species used in the study, there were variations between genotypes for the same variable, as highlighted by plant height, number of panicle per unit area; such occurrence was justified due to the intrinsic characteristics of each genotype, such as height and yield potential. The justification adopted by…”

Section: Resultssupporting

confidence: 88%

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

et al. 2023

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The growth and yield performance of white oat cultivars may vary in response to doses of trinexapac-ethyl (TE) growth regulator. The objective of the work was to evaluate the lodging and productive performance of white oat cultivars under different doses of trinexapac-ethyl growth regulator. The experiments were carried out in a randomized complete block design with four replications, in a 4 x 2 factorial scheme, with four doses of trinexapac-ethyl (0, 50, 100 and 150 g ha -1 ) applied in the phenological stage between the 1 st visible stalk node and the 2 nd perceptible node in two white oat cultivars (URS Altiva and URS Corona). The following were evaluated: plant height, panicle length, panicles per m 2 , spikelets per panicle, grains per spikelet, number of grains per panicle, thousand grain weight, plant lodging and grain yield. The application of trinexapac-ethyl at doses 100 and 150 g ha -1 reduces plant height and panicle components: length, number of spikelets and grains per panicle of the two cultivars. TE doses above 100 g ha -1 provide a significant reduction in lodging with an increase in the number of panicles per m 2 and in grain yield for the two white oat cultivars.

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Section: Resultssupporting

confidence: 88%

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

et al. 2023

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“…Studies that find that TE reduces lodging also find that TE reduces plant height (Subedi et al, 2021;Wiersma et al, 2011). Here, we also find that TE reduced plant height, but only in the environments where TE also reduced lodging (Figure 1B;Winchester 2020 and2021). TE also significantly increased SF r at Winchester in 2020 (3.8 vs. 4.7; Table S2).…”

Section: Effect Of Trinexapac-ethyl (Te) and N Rate Interactionssupporting

confidence: 71%

“…As opposed to yield, North American studies detect a more consistent effect of TE on lodging (Swoish & Steinke, 2017; Wiersma et al., 2011). Studies that find that TE reduces lodging also find that TE reduces plant height (Subedi et al., 2021; Wiersma et al., 2011). Here, we also find that TE reduced plant height, but only in the environments where TE also reduced lodging (Figure 1B; Winchester 2020 and 2021).…”

Section: Resultsmentioning

confidence: 99%

“…In the absence of lodging, TE had no effect on winter wheat yield in Michigan (Quinn & Steinke, 2019), Delaware (Kleczewski & Whaley, 2018), or Oregon (Qin et al., 2020). However, in a multi‐site trial across the Canadian Prairies when no lodging was observed, TE did significantly increase yield in one of two tested winter wheat cultivars (Subedi et al., 2021).…”

Section: Resultsmentioning

confidence: 99%

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Row spacing, seeding depth, seeding rate, and trinexapac‐ethyl effects on oat yield and lodging

Studhalter,

Janovicek,

Kim

et al. 2023

Crop Science

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Lodging can reduce the yield and quality of oats (Avena sativa L.). Root lodging, as opposed to stem lodging, is the predominant form of lodging in oats. Therefore, identifying management practices that enhance root lodging resistance should be prioritized. The objective of this study was to investigate the effect of four management practices on oat grain yield, yield components, grain quality, observed lodging, and plant traits that contribute to root lodging resistance. Row spacing and seeding depth were tested in three oat cultivars across two environments in Ontario, Canada. Seeding rate and the application of the plant growth regulator trinexapac‐ethyl (TE) at different nitrogen (N) fertilizer rates were tested in two‐to‐three oat cultivars across four environments. Lodging occurred naturally in all environments, with root lodging always occurring, sometimes in combination with stem lodging. Under high lodging pressure, shallow seeding increased lodging. Similarly, lodging increased with greater seeding rates when lodging pressure was high. Reducing row spacing had no effect on lodging but was the only management practice to consistently increase grain yield. TE reduced lodging in some environments, especially as N rates increased. Root plate spread, root plate depth, and root safety factor were minimally affected by the management practices studied and had complex interactions with genotype and environment. Among the measured crop traits, plant height had the strongest and most consistent relationship to observed lodging.

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“…This supposed damage to seed vigour can also reduce seed germination, plant stand and plant tillering, which then usually reduces grain yield. The adverse action of TE on modern wheat genotypes is currently under study in temperate regions such as North America (Subedi et al, 2021). However, we are not aware of previous studies evaluating TE damage to spring wheat grown in Brazil or in other tropical countries.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and trinexapac-ethyl effects on wheat grain yield, lodging and seed physiological quality in southern Brazil

Faria¹,

Silva

Lollato

2022

Ex. Agric.

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Summary Nitrogen (N) fertilization affects wheat yield and grain protein concentration; however, its mismanagement can increase plant lodging. While the use of plant growth regulators such as trinexapac-ethyl (TE) can mitigate plant lodging, their effects on seed physiological quality are not well known. The aim of this study was to evaluate the effects of N fertilization and TE on wheat yield, lodging and seed quality of spring wheat varieties. It was carried out in the 2018 growing season in the environments of Londrina and Ponta Grossa, Brazil. A randomized complete block design was used with a 2 × 3 × 3 factorial arrangement to evaluate two wheat genotypes (WT 15008 and WT 15025), three top-dressing N rates (0, 40 and 120 kg ha−1), and three TE rates (0, 50 and 100 g ha−1). Agronomic characteristics related to wheat productivity (hectolitre weight, thousand-grain weight, density of fertile spikes, plant height, lodging and grain yield) and seed physiological quality (seed germination and vigour; length and dry matter of normal seedlings) were evaluated. Increasing N rates up to 120 kg ha−1 increased plant lodging up to 26.4 percentage points for WT 15025 in Londrina. TE impaired some traits of seed physiological quality. Spraying 100 g ha−1 TE on the plants reduced seedling length by 9.4% in the seeds of WT 15008 harvested in Ponta Grossa compared to the TE control (0 g ha−1). The dry matter of the seedlings from the seeds harvested in Londrina declined by 7.2% due to the application of 100 g ha−1 TE, compared to the control. However, a lower rate of TE (50 g ha−1) might be enough to minimize plant lodging without impairing the physiological quality of the seeds, depending on the rate of N fertilization. This study is the first step in providing empirical evidence for the detrimental effects of TE in combination with N on wheat seed quality, suggesting that seed producers should exercise caution in managing TE and N fertilization.

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Winter cereal responses to dose and application timing of trinexapac‐ethyl

Cited by 7 publications

References 30 publications

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

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

Row spacing, seeding depth, seeding rate, and trinexapac‐ethyl effects on oat yield and lodging

Nitrogen and trinexapac-ethyl effects on wheat grain yield, lodging and seed physiological quality in southern Brazil

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