Germination and emergence of trumpet flower (tecoma stans) under different environmental conditions

Reis, Fabrícia Cristina dos; Sotomayor, Jaime Felipe Medina; Garcia, Danilo de Brito; Barroso, Arthur Arrobas Martins; Albrecht, Alfredo Júnior Paiola; Filho, Ricardo Victória

doi:10.1590/s0100-83582014000200005

Cited by 4 publications

(10 citation statements)

References 17 publications

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“…Por otro lado, a partir de los 3 cm de profundidad, la maleza presentó un tiempo medio de emergencia superior a 11, lo cual sugiere que otros factores como las reservas energéticas de las semillas, que varían de acuerdo al tamaño y la concentración de dióxido de carbono y oxígeno, podrían influir en la capacidad de emergencia de la especie en estudio (Benvenuti, 2003;Reis et al, 2014).…”

Section: Profundidad De Entierrounclassified

“…La cantidad de residuos acumulados luego de la cosecha del cultivo de caña de azúcar en la Argentina varía entre 14 y 20 t ha -1 (Digonzelli et al, 2009). En Brasil, se ha reportado que los residuos de caña de azúcar dejados en el campo como cobertura tienen la capacidad de suprimir la emergencia de gramíneas, cuando alcanzan volúmenes de 9 a 15 t ha -1 (Silva Junior, 2014).…”

Section: Presencia De Residuos De Cosechaunclassified

“…En Tucumán, Argentina, el cultivo de la caña de azúcar se desarrolla en distintas regiones agroecológicas, con características fisiográficas, climáticas y edáficas diversas, por lo que las labores llevadas a cabo en el área cañera incluyen prácticas variadas, tales como la quema, el laboreo intensivo y/o el mantenimiento de una cobertura de residuos sobre la superficie del suelo (Romero et al, 2009). La diversidad de las características edafoclimáticas, la intensificación de las prácticas de manejo, o su reemplazo por otras, producen modificaciones en las poblaciones de malezas (Chauhan, 2012).…”

Section: Introductionunclassified

“…Por el contrario, la labranza cero tiende a aumentar el banco de semillas en los primeros centímetros de suelo, por lo que la densidad de emergencia de plántulas podría ser mayor (Singh et al, 2015). Sin embargo, en caña de azúcar la espesa cobertura de residuos (de 14 a 20 toneladas de materia seca por hectárea) dejada en la superficie del suelo (Digonzelli et al, 2009) afectaría la emergencia. No obstante, no se han registrado aún antecedentes de dichos efectos en la germinación y emergencia de M. maximus.…”

Section: Introductionunclassified

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GERMINACIÓN Y EMERGENCIA DE Megathyrsus maximus VAR.maximus

Cabrera¹,

Sobrero²,

Chaila³

et al. 2015

Planta daninha

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RESUMEN -Se estudió la germinación de semillas de Megathyrsus maximus al exponerlas a altas temperaturas y el efecto de diferentes profundidades de siembra y cantidades de residuos de cosecha en la emergencia de las plántulas. En laboratorio, se determinó la germinación y biomasa de semillas con y sin glumas y glumelas, expuestas a 0, 40, 60, 80 y 100 o C durante cinco minutos. Se realizaron dos experimentos en invernáculo para evaluar la emergencia de la maleza, primero a diferentes profundidades de siembra: 0, 0.5, 1, 2, 3, 4, 5, 7 y 8 cm. Posteriormente, se evaluó emergencia con diferentes cantidades de residuos de cosecha: 0, 5, 8, 11, 13, 15 y 18 t ha -1 . Los resultados de los ensayos de temperatura se analizaron mediante análisis de covarianza y los datos de los ensayos de invernáculo mediante regresión. Los máximos porcentajes de germinación para semillas con y sin glumas y glumelas se obtuvieron a 40 o C y fueron del 35 y 48%, respectivamente; los mínimos valores se registraron a los 80 o C y fueron del 7 y 28%, respectivamente. La profundidad de siembra afectó la emergencia: un 51% se registró en el testigo, valor que disminuyó al 23,3% a los 7 cm y a 0% a los 8 cm. Los residuos de cosecha también afectaron la emergencia: con 0 a 18 t ha -1 , esta disminuyó del 64,8 al 0%. Puede concluirse que las estrategias implementadas en el manejo del cultivo de caña de azúcar afectarán la germinación y emergencia de M. maximus (0, 0.5, 1, 2, 3, 4, 5, 7 and 8 cm) on the one hand, and in relation to different sugarcane crop residue quantities (0.5, 8, 11, 13, 15 and 18 t ha -1

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Section: Profundidad De Entierrounclassified

Section: Presencia De Residuos De Cosechaunclassified

Section: Introductionunclassified

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GERMINACIÓN Y EMERGENCIA DE Megathyrsus maximus VAR.maximus

Cabrera¹,

Sobrero²,

Chaila³

et al. 2015

Planta daninha

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“…Também pode se propagar por pedaços de caule e raízes, característica inerente à rápida rebrota após o corte da parte aérea. Além disso, essa espécie também pode apresentar potencial alelopático (Lorenzi, 2000;Socolowski et al, 2011;Reis et al, 2014;Cipriani et al, 2014).…”

Section: Introductionunclassified

Controle de amarelinho (Tecoma stans) em pastagem com aplicações localizadas de herbicidas

et al. 2016

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Controle de amarelinho (TecomaAbstract -The presence of yellow bells (Tecoma stans) in pastures can compromise the implantation and the development of forage, damaging animal production and hindering mechanized operations with trailing implements. The objective of this paper was to evaluate the yellow bells control after localized herbicides applications and the fitointoxication of pasture composed of Urochloa maxima (syn Panicum maximum). The treatments were triclopyr (4%) and triclopyr (3%) applied to the stump base (SB); picloram (2%) applied on stump after plants (SA); triclopyr + picloram (1% + 1%) and triclopyr + picloram (2% + 2%) SB; plus a check without herbicide application and a check where plants were mowed. All herbicides treatments resulted over 95% control 270 days after application and were more efficient than stump cut treatment, which showed capacity of regrowth. The herbicides promoted injures on pasture, however the symptoms were observed only in the area located around the T. stans plants.

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Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia

Vargas-Figueroa

Torres-González

2018

RBT

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Seed germination and seed longevity under different environmental conditions are fundamental to understand the ecological dynamics of a species, since they are decisive for its success within the ecosystem. Taking this into account, seed germination and seed storage behavior of a pioneer species of tropical dry forest (Tecoma stans) were studied in the laboratory, to establish the effect of different environmental conditions on a local tree population. Two seed lots collected in July 2011, from Cali (Colombia), were evaluated under three alternating temperatures (20/30, 20/25, 25/30 ºC; 16/8 h) and four light qualities (12-hour white light photoperiod, darkness, and 15 minutes of red light -R and far red light -FR). Final germination was recorded for all treatments; for white light treatment the daily germination was recorded to calculate mean germination rate, mean germination time, and two synchronization indices. To assess the effect of light quality on physiological variables, a destructive germination test was carried out. For this test, another seed lot was evaluated under the same light conditions using an alternating temperature of 20/30 °C - 16/8 h, recording germination during six days for every treatment. In addition, seeds were stored at two different moisture contents (7.7, 4.1 %) and three storage temperatures (20, 5, -20 ºC), during two time periods (one and three months); a seed germination test was conducted for each treatment. Four replicates of 35 seeds per treatment were used for all experiments. Germination was high (GP > 90 %) with all alternating temperatures under white light, whereas under R, FR, and darkness germination was evenly successful at low temperatures, but at higher temperature, half of the seeds entered into secondary dormancy (GP= 45-65 %). However, mean germination rate and synchronization under R and FR decreased significantly in comparison to white light treatment and, consequently, mean germination time increased. Seed storage behavior of this species is orthodox due to the high germination (GP > 90 %) obtained under all treatments. In conclusion, T. stans seeds have a negative germination response at high incubation temperatures in the absence of white light, entering into a secondary dormancy. In contrast, an environment with a lower temperature and without white light delays the germination, but at the end seeds are able to reach the same germination values. This seed dependence on incident light in limiting conditions suggests a physiological mechanism on the seed tissues of this species, probably mediated by phytochromes. Finally, the orthodox seed storage behavior of T. stans is a reason to include this species in ex situ seed conservation programs for restoration and recovery of the tropical dry forest; however, long-term studies should be conducted in order to evaluate the maintenance of this characteristic throughout longer periods of time. Rev. Biol. Trop. 66(2): 918-936. Epub 2018 June 01.

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Germination and emergence of trumpet flower (tecoma stans) under different environmental conditions

Cited by 4 publications

References 17 publications

GERMINACIÓN Y EMERGENCIA DE Megathyrsus maximus VAR.maximus

GERMINACIÓN Y EMERGENCIA DE Megathyrsus maximus VAR.maximus

Controle de amarelinho (Tecoma stans) em pastagem com aplicações localizadas de herbicidas

Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia

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