Trinexapac-ethyl rate and application timing effects on seed yield and yield components in tall fescue

Chastain, Thomas G.; Young, William C.; Garbacik, Carol J.; Silberstein, Thomas B.

doi:10.1016/j.fcr.2014.12.013

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…Rampton (1969) did not find any differences in seed germination across the range of seed weights similar to those observed for the TE‐treated seed in this study; therefore, it is unlikely that the lower weight seed evident in TE treatments caused reduced seed germination. The reduction in seed weight resulting from application of TE PGR on clover seed crops has been reported previously in red clover (Anderson et al, 2016) but not in cool‐season grass seed crops, where TE PGR has gained worldwide acceptance (Chastain et al, 2014, 2015).…”

Section: Discussionmentioning

confidence: 62%

“…Silberstein et al (1996) reported a reduction in stem height and in the mean number and length of internodes resulting from paclobutrazol PGR application in red clover. Stem length was reduced by TE in cool‐season grasses, but biomass was not affected by PGR application (Chastain et al, 2014; 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Trinexapac‐ethyl is a lodging control agent that inhibits GA biosynthesis because of its structural similarity to 2‐oxoglutaric acid, a co‐substrate in dioxygenase catalysis in the late stages of GA biosynthesis. Trinexapac‐ethyl has been widely adopted for use as a lodging control agent and as a seed yield–enhancing tool in cool‐season forage and turf grass seed production (Chastain et al, 2014, 2015).…”

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confidence: 99%

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Trinexapac‐ethyl Affects Seed Production in Crimson Clover

2019

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Core Ideas Crimson clover canopy height was reduced with trinexapac‐ethyl applications. Seeds m–2 in crimson clover was increased by trinexapac‐ethyl applications. Seed yield responses to trinexapac‐ethyl were dependent on spring weather conditions. Seed weight reductions were inversely proportional to trinexapac‐ethyl rate. This is the first study to document effects of trinexapac‐ethyl on crimson clover seed crops. ABSTRACT Trinexapac‐ethyl (TE), a plant growth regulator (PGR) and lodging‐control agent, increases seed yield in red clover (Trifolium pratense L.), but the effects of TE are unknown in crimson clover (Trifolium incarnatum L.) seed crops. The objectives of this study were to determine TE application rate and timing effects on crop canopy characteristics, seed yield, and seed yield components of crimson clover. On‐farm trials were conducted at two locations (Banks and St. Paul, OR) in 2012 and 2013 and at the Hyslop Research Farm near Corvallis, OR, in 2015 and 2016. Treatments were TE PGR application rates (0, 105, 140, 210, 280, 420, and 560 g a.i. ha−1) and two application timings (stem elongation, Biologische Bundesanstalt, Bundessortenamt und CHemische Industrie [BBCH] 32; inflorescence emergence, BBCH 51). Application of TE PGR reduced height of the seed crop canopy. Seed yield was increased in 2012 and 2013 with rates ≤280 g TE ha−1 when applied at the BBCH 32 timing. Seed yield increases attributable to TE ranged from 12 to 36%. However, no effects of TE application on seed yield were observed in 2015 and 2016, likely as a result of dry and warm spring weather. Seed yield increases in 2012 and 2013 were a result of TE‐induced increases in seeds m−2. Seed weight was reduced by TE application, and these reductions were inversely proportional to TE rate. Seed yield responses in crimson clover to TE PGR varied across years and locations, with seed yield increases occurring in wet and cool spring weather conditions.

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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Trinexapac‐ethyl Affects Seed Production in Crimson Clover

2019

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“…The applications of PGRs (TE, CCC) during spring have been shown to improve seed yields of Lolium perenne L. [17], Dactylis glomerata L. [18,19] and Festuca arundinacea Schreb. [20]. In Festuca rubra L., application of TE increased the seed yield but the effect varied between years [1].…”

Section: Discussionmentioning

confidence: 96%

“…To date, the few studies on the use of PGRs in seed cultivation of Lolium perenne L. [17], Dactylis glomerata L. [18,19], and Festuca arundinacea Schreb. [20] Concerned mainly TE, and less often paclobutrazole, CCC, or prohexadione-Ca. Further studies are needed to evaluate the interactions between N rates and spring PGR applications in the seed cultivation of diverse genotypes of red fescue [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Plant Growth Regulators and N Rate on the Morphological Traits of Generative Tillers and Seed Yields of Chewings and Strong Creeping Red Fescue

2020

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Plant growth regulators (PGRs) are used as a management tool to minimize plant height and subsequent stem lodging in grass seed crops. Their efficacy is influenced not only by the method of application, but also by the management and genetic variations within and between species. This aim of the study was to evaluate the effect of PGRs on morphological traits of generative tillers and seed yield of Festuca rubra L ssp. rubra (strong creeping red fescue) and F. r. L ssp. commutata (Chewings red fescue) under low and medium doses of spring nitrogen fertilization (40 and 70 kg N ha−1). PGRs were applied as: chlormequat chloride (CCC) at BBCH 30–31; CCC at BBCH 30–31 + ethephon (ET) at BBCH 37–39; CCC at BBCH 30–31 + trinexapac-ethyl (TE) at BBCH 37–39. All the application methods of PGRs resulted in the shortening of the second internode, and the sequential application of CCC with ET or TE also resulted in the shortening of the third internode. In each PGR treatment, the lodging index in the plant (canopy height to tiller length ratio) was higher than that of the control. PGRs had a beneficial effect on the seed yield. The greatest increase in the seed yield was recorded after the application of CCC+TE. No interaction between PGRs and spring N fertilization rates on the seed yield of red fescue. The increase in the dose of spring nitrogen fertilizer from 40 to 70 kg N ha−1 resulted in a significant increase in yield. Seed yield of chewing red fescue cv. Dorosa was 29% higher than strong creeping red fescue cv. Nista, mainly due to an increase in the number of generative tillers.

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