Aspects of the Sexual Reproduction of the Brazilian Arnica (Solidago Chilensis Meyen Var. Megapotamica (D.C.) Cabrera - Asteraceae)

Correia, Ezequias Teófilo; Ming, Lin Chau; Câmara, Francisco Luiz Araújo

doi:10.17660/actahortic.1999.502.11

Cited by 3 publications

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“…no heat and no smoke) in T. officinale , T. minuta, C. bonariensis and S. chilensis agrees with previous findings (Fenner ; Washitani ; Correia et al . ; Ferreira et al . ).…”

Section: Discussionmentioning

confidence: 99%

Germination response of common annual and perennial forbs to heat shock and smoke treatments in the Chaco Serrano, central Argentina

Arcamone

Jaureguiberry

2018

Austral Ecology

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Fire is a key ecological factor affecting plant dynamics. In the last few decades, fire occurrence in the Chaco region has increased noticeably, challenging the adaptive capacity of plants to regenerate after a fire. Broad-leaved forb species have been much less studied than woody and graminoids, although they are an important component of fire dynamics. Here we analysed the germination response to heat shock of 70 and 110°C, smoke and their combination in 10 broad-leaved herbaceous species frequently occurring in the Chaco Serrano of C ordoba province, central Argentina, including five annual (Bidens subalternans, Conyza bonariensis, Schkuhria pinnata, Tagetes minuta and Zinnia peruviana) and five perennial species (Borreria eryngioides, Sida rhombifolia, Solidago chilensis, Taraxacum officinale and Verbena litoralis). We also compared the response of annual versus perennial species. Six species had highest germination when treated with heat and smoke combined, whereas two had lowest germination under this treatment, indicating synergistic and antagonistic interaction of these factors respectively. Most of the species tolerated heat shock (i.e. germination was similar to that in control treatment), whereas others had higher germination in response to heat shock, especially under the moderate 70°C treatment. Germination was higher than control (i.e. no heat and no smoke) after smoke treatment in four species. Perennial species showed higher average germination than annuals in both heat treatments and in the control. Annual species had higher average germination for all treatments involving smoke. The high variability observed at the species level, and the limited number of species studied calls for precaution in interpreting and extrapolating results. Nevertheless, our study shows a general positive response of both perennial and annual species to fire cues, suggesting an advantage of these species for colonizing post-fire environments, and being favoured under scenarios of increasingly frequent low-to-medium intensity fires.

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“…no heat and no smoke) in T. officinale , T. minuta, C. bonariensis and S. chilensis agrees with previous findings (Fenner ; Washitani ; Correia et al . ; Ferreira et al . ).…”

Section: Discussionmentioning

confidence: 99%

Germination response of common annual and perennial forbs to heat shock and smoke treatments in the Chaco Serrano, central Argentina

Arcamone

Jaureguiberry

2018

Austral Ecology

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“…DC. ), Ikuta e Barros (1996) recomendam temperaturas de 20 a 25°C e semeadura superficial das sementes, enquanto Correia et al (1999) sugerem a utilização de grande quantidade de sementes por unidade de área na propagação sexuada da arnica brasileira (Solidago chilensis Meyen var. megapotamica (DC) Cabrera) devido a baixa porcentagem de germinação verificada nesta asterácea (20% a 20°C e 12% a 20-30°C, aos 14 dias).…”

Section: Introductionunclassified

Efeito da pré-embebição e aplicação de ácido giberélico na germinação de sementes de macela

Bezerra

Filho

Bruno

et al. 2006

Rev. bras. sementes

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RESUMO -O trabalho teve o objetivo de avaliar o efeito da ação conjunta da pré-embebição e da aplicação de ácido giberélico na germinação de sementes de macela (Egletes viscosa (L.) Less.). Os tratamentos foram dispostos em arranjo fatorial 3x3 (pré-embebição das sementes em água por 0, 24 e 48h e, umedecimento do substrato com ácido giberélico-GA 3 nas concentrações de 0, 100 e 300ppm) no delineamento inteiramente casualizado, com quatro repetições. As sementes foram colocadas para germinar sobre papel, em placas de Petri, de 9cm de diâmetro, forradas com dois discos de papel de filtro (50 sementes/repetição), com quantidade inicial de água (0ppm de GA 3 ) ou solução aquosa de GA 3 (100 e 300ppm) equivalente a duas vezes o peso do papel. As placas foram colocadas em uma câmara de germinação, a temperatura alternada de 20-30°C e fotoperíodo de 8h de luz e 16h de escuro, efetuando-se contagens diárias, do 5° até o 40° dia após a semeadura, para determinação da porcentagem, velocidade e tempo médio de germinação. A pré-embebição das sementes em água (24 e 48h) ou o umedecimento do substrato com GA 3 (100 ou 300ppm) aumenta a porcentagem e velocidade de germinação e reduz o tempo médio de germinação.Termos para indexação: Egletes viscosa, planta medicinal, pré-tratamento, qualidade fisiológica. EFFECT OF PRE-SOAKING AND GIBERELIC ACID APPLICATION ON Egletes viscosa SEEDS GERMINATIONABSTRACT -. The experiment was the simultaneous evaluation of the effect of pre-soaking with water and giberelic acid application on macela (Egletes viscosa) seed germination. The treatments were disposed in a factorial arrangement 3x3 (pre-soaking of the seeds with water for 0, 24 and 48 hours and moistening of the substract with giberelic acid -GA 3 , at the concentrations of 0, 100 and 300ppm) in a completely randomized design, with four replications. The seeds were sown for germination on filter paper, in 9 cm diameter Petri plates, lined with two filter paper disks (50 seeds per plate), with a initial amount of water (0ppm of GA 3 ) or aqueous GA 3 solution (100 and 300ppm), equivalent to two times the paper weight. The plates were stored in a germination chamber, with alternated temperature of 20-30°C and photoperiod of 8 hours under light, 30°C, and 16 hours of darkness, 20°C. Daily countings were made for 40 days after the sowing in order to determine the percentage, rate and the average time of germination. The analysis of the obtained results permitted the conclusion that pre-soaking the seeds in the water (24 and 48h) and the substrate humidification with GA 3 (100 and 300ppm) increased the germination percentage and rate and reduced the average germination time.

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Evaluación de variables agronómicas en el cultivo de vara de oro (Solidago chilensis Meyen) en la pampa húmeda argentina

Perez,

Lus,

Barrientos

et al. 2023

AgriS

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Vara de oro (Solidago chilensis) es una especie herbácea perenne nativa de Argentina. Aunque presenta importantes propiedades medicinales y potencial valor ornamental, esta especie no tiene producción en la pampa húmeda. El presente trabajo evalúa el efecto de dos densidades de siembra (71 500 y 143 000 plantas.ha-1, campaña 2013-2014) y dos fechas de siembra (temprana en septiembre y tardía en noviembre, campaña 2014-2015) en la fenología, caracteres morfométricos y rendimiento de materia seca de dos cosechas por ciclo de cultivo. Se determinó que la fenología y los rendimientos de ambas cosechas no fueron afectados por la densidad de siembra. Sin embargo, la menor densidad disminuyó la longitud del tallo principal y aumentó el largo de la inflorescencia principal y el número de ramas basales. La siembra temprana alargó el período vegetativo y el reproductivo, e incrementó la longitud del tallo principal, número de inflorescencias, número de ramas basales y rendimientos de la primera y segunda cosecha. En ambas campañas, la primera cosecha produjo mayores rendimientos que la segunda. Como prácticas de manejo para el cultivo en la región se recomienda la siembra en septiembre con una densidad de 71 500 plantas.ha-1 y una sola cosecha por ciclo.

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Aspects of the Sexual Reproduction of the Brazilian Arnica (Solidago Chilensis Meyen Var. Megapotamica (D.C.) Cabrera - Asteraceae)

Cited by 3 publications

References 0 publications

Germination response of common annual and perennial forbs to heat shock and smoke treatments in the Chaco Serrano, central Argentina

Germination response of common annual and perennial forbs to heat shock and smoke treatments in the Chaco Serrano, central Argentina

Efeito da pré-embebição e aplicação de ácido giberélico na germinação de sementes de macela

Evaluación de variables agronómicas en el cultivo de vara de oro (Solidago chilensis Meyen) en la pampa húmeda argentina

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