Effects of Trinexapac-Ethyl on different wheat varieties under desert conditions of Mexico

Grijalva-Contreras, Raúl Leonel; Macías-Duarte, Rubén; Martínez-Díaz, Gerardo; Robles-Contreras, Fabián; Núñez-Ramírez, Fidel

doi:10.4236/as.2012.35079

Cited by 14 publications

(12 citation statements)

References 9 publications

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“…The GS29-Half treatment reduced yield the least in Blackstone and was still 16% less than untreated barley. Grijalva-Contreras et al (2012) observed grain yield decreases in wheat up to 13%, but only with greater TE rates than tested in this study (14.4 fl oz TE acre −1 ). Grain yield was significantly decreased by 41-42% in Holland following all treatments with TE application at GS32, compared to the check.…”

Section: Effect Of Plant Growth Regulator On Grain Parameterscontrasting

confidence: 41%

Trinexapac‐ethyl rate and timing impact on malt barley production in Virginia

Swoish

Filho

Reiter

et al. 2021

Crop Forage & Turfgrass Mgmt

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Increased demand for local malting barley (Hordeum vulgare L.) for breweries and distilleries creates an opportunity for Virginia farmers. Lodging may decrease grain yield, reduce quality, and cause harvesting difficulties. Trinexapac-ethyl (TE) is a plant growth regulator that reduces cell elongation and creates a shorter, sturdier stem. Field studies were initiated in 2017 and 2018 to test TE effects on 'Flavia' and 'Violetta' two-rowed winter barleys at Blackstone and Holland, VA. Treatments consisted of: no TE; 7.2 fl oz TE acre −1 and 14.4 fl oz TE acre −1 at Zadoks growth stage (GS) 29; 7.2 fl oz TE acre −1 and 14.4 fl oz TE acre −1 at GS32; and 14.4 fl oz TE acre −1 equally split between GS29 and GS32 in a randomized complete block with four replications. Plant height, lodging incidence, and grain yield were measured. The effect of TE rate and timing varied, but all applications at GS32 resulted in significantly shorter plants. Plant lodging was decreased in 2019 at Blackstone by all TE applications compared to untreated. Plant height was decreased by as much as 42% in 2019 and plant injury was observed. Grain yield was decreased by all TE applications in Blackstone and GS32 and split applications in Holland in 2019, presumably due to stress preceding and following TE application. Plant growth at the time of application, forecasted weather, and cultivar susceptibility to lodging should all be considered when determining the optimal TE application rate and timing to reduce plant height without negatively impacting grain yield.

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Section: Effect Of Plant Growth Regulator On Grain Parameterscontrasting

confidence: 41%

Trinexapac‐ethyl rate and timing impact on malt barley production in Virginia

Swoish

Filho

Reiter

et al. 2021

Crop Forage & Turfgrass Mgmt

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“…Reports by Grijalva‐Contreras et al. (2012) and Zhang et al. (2017) indicate the application of TE may even reduce grain yield in a semidwarf wheat cultivar.…”

Section: Resultsmentioning

confidence: 97%

“…Initially, we observed a positive response for yield for Flourish at Lethbridge (data not shown); however, a cultivar × TE interaction was eventually detected with the accumulation of additional site-years and was largely the result of a lack of yield response to TE when applied to Flourish (Figure 3). Reports by Grijalva-Contreras et al (2012) and Zhang et al (2017) indicate the application of TE may even reduce grain yield in a semidwarf wheat cultivar. In a semidwarf or reduced height cultivar, reductions in canopy height caused by TE applications could possibly interfere with light interception and canopy gas exchange, which might result in lower biomass production and grain yield (Gent, 1995).…”

Section: Crop Sciencementioning

confidence: 99%

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

et al. 2021

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Trinexapac-ethyl (TE) is a plant growth regulator commonly used in cereal production systems. It retards plant growth by inhibiting gibberellin (GA) biosynthesis, thereby reducing the risk of stem lodging. Lodging at the latter stages of crop development can compromise grain yield and quality. Thus, application of TE may protect yield and quality in winter cereals. A field study was conducted from 2014 to 2017 across the Canadian Prairies to determine the effects of TE dose and application timings on lodging, canopy architecture, grain yield, and quality of winter cereals. Trinexapac-ethyl treatments consisted of 0.6× (60 g a.i. ha −1 ) and 1× (100 g a.i. ha −1 ), which were applied to two winter wheat (Triticum aestivum L.) cultivars, 'Flourish' and 'Moats', and a fall rye (Secale cereale L.) cultivar 'Hazlet', at Feekes 5 and 7 growth stages. Compared with the control, TE application increased grain yield by 3-8%, reduced plant height by 5-10%, and shortened internode length. Plant height reductions were most notable when TE was applied at the 1× rate at Feekes 7. The most responsive crop was fall rye, which could be expected given its tall stature relative to the wheat cultivars. Most of the tested environments, including irrigation, did not induce heavy stem lodging; therefore, observations of positive yield responses in the absence of lodging were unexpected. Our findings suggest that there is a role for TE in winter cereal production systems, provided the magnitude of crop responses justifies the added input costs.

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“…Days to maturity were increased for three out of four of those comparisons. Previous studies have shown delays in wheat maturity with trinexapac, although scale of effect was dependent on rate and timing of application (Wiersma et al 2011;Grijalva-Contreras et al 2012).…”

Section: Days To Maturitymentioning

confidence: 96%

Effects of plant growth regulator applications on malting barley in western Canada

Tidemann

O’Donovan

Izydorczyk³

et al. 2020

Can. J. Plant Sci.

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Malting barley is important in western Canada, yet many malting cultivars do not make malt quality, in part due to lodging. Lodging can decrease barley yield and quality thereby reducing the acceptability for malting. In other countries plant growth regulator applications are used to mitigate lodging. Chlormequat chloride (chlormequat), trinexapac-ethyl (trinexapac) and ethephon were tested at five locations over 3 years in western Canada for their ability to limit lodging, as well as their effects on yield, agronomic traits, and pre-malt quality characteristics. PGR applications occurred between GS 30-33 for chlormequat and trinexapac and GS 37-49 for ethephon. Seeding rates of 200, 300, and 400 seeds m-2 of CDC Copeland barley were used to increase the likelihood of lodging. Increased seeding rate decreased tillers per plant, height, days to maturity, kernel protein and kernel weight. Ethephon increased the number of tillers per plant, and decreased plant height, kernel plumpness and kernel weight. Trinexapac decreased plant height and kernel weight. Days to maturity was investigated across site-years with ethephon increasing maturity in 60% of comparisons. Trinexapac and chlormequat had limited effects on maturity. Lodging was investigated across site-years with trinexapac showing the largest number of lodging reductions and scale of reductions. Ethephon reduced lodging in 36% of comparisons, while chlormequat had inconsistent effects. None of the products affected yield, or grain protein. Plant growth regulators may not be the solution to lodging for CDC Copeland barley on the Canadian Prairies, however trinexapac shows the most promise of the products tested.

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Effects of Trinexapac-Ethyl on different wheat varieties under desert conditions of Mexico

Cited by 14 publications

References 9 publications

Trinexapac‐ethyl rate and timing impact on malt barley production in Virginia

Trinexapac‐ethyl rate and timing impact on malt barley production in Virginia

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

Effects of plant growth regulator applications on malting barley in western Canada

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