Técnica de cruzamentos controlados em Euphorbia heterophylla L.

Várgas, Leandro; Borém, Aluízio; Silva, Antônio Alberto da

doi:10.1590/s0006-87051999000100004

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…Emasculation and pollination were performed between stages 2-4 of flower development, during which there is a better probability of fertilization and formation of 3 seeds per cyathium (Vargas et al, 1999). Pollination was started on the same day as emasculation and continued on subsequent days until fertilization was confirmed by observing the curvature of the pedicel (Vargas et al, 1999). F 1 generation plants were backcrossed with their susceptible (RC 1 ) and resistant (RC 2 ) parents.…”

Section: Methodsmentioning

confidence: 99%

“…Wild poinsettia (Euphorbia heterophylla) native to tropical and subtropical regions of the Americas (Kissmann and Groth, 1992) and very abundant in cultivated areas in the South, Central West and Southeast regions of Brazil (Vargas et al, 1999), is one of the most feared weed species in these areas. Among the biological characteristics that hinder the control of wild poinsettia in crops include its rapid initial development, emergence in flows and the high genetic variability of the species (Trezzi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Inheritance of Resistance to Protoporphyrinogen Oxidase Inhibitor Herbicides in Wild Poinsettia

et al. 2016

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-Weed resistance to herbicides is a major global problem for agriculture. In recent years, the increased use of herbicides, without proper planning, has led to a large increase in the number of cases of weed biotypes that are resistant to one or more herbicide mechanism of action. Wild poinsettia biotypes (Euphorbia heterophylla), discovered in the State of Paraná, with resistance to herbicides that inhibit protoporphyrinogen oxidase (PROTOX) and acetolactate synthase (ALS), are the first case to exhibit multiple resistance in Brazil. This study analyzed the genetic inheritance of PROTOX inhibiting herbicide resistance in E. heterophylla. Crosses were conducted between biotypes that were susceptible (female parent) and those carrying multiple resistance to ALS and PROTOX inhibitors (male parent) to obtain the F 1 generation. Backcrosses were performed (RC 1 and RC 2 ) and the F 1 generation was advanced to F 2 . F 1 , F 2 , RC 1 , RC 2 generation plants and their parents were subjected to applications of the herbicide fomesafen (250 g i.a. ha -1 ). The observed frequencies in the F 2 generation were not different from the expected frequency of 3:1. All RC 2 individuals were resistant, while the RC 1 population showed a 1:1 segregation, which would be expected when a single gene controls the trait. Thus, it can be inferred that E. heterophylla resistance to PROTOX-inhibiting herbicides is conditioned by a single and dominant nuclear gene.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inheritance of Resistance to Protoporphyrinogen Oxidase Inhibitor Herbicides in Wild Poinsettia

et al. 2016

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“…However, the pollen dehiscence is more visible and the receptivity of the hermaphrodite flowers was observed three days after the release of the male gametes, pollen dehiscence being a better indicator to identify the right moment for pollination. In this regard, Vargas et al (1999) noted that in E. heterophylla pollen release was greater with increasing temperature increase occurring after noon or late afternoon, this in Viçosa, Brasil.…”

Section: Moment Of Pollinationmentioning

confidence: 81%

“…Sin embargo, es más visible la dehiscencia de polen y se observó que la receptividad de las flores hermafroditas ocurrió tres días después de la liberación de los gametos masculinos, pudiendo ser la dehiscencia del polen un mejor indicador para identificar el momento adecuado para la polinización. Al respecto, Vargas et al (1999) señalaron que en E. heterophylla la liberación de polen fue mayor con el aumento de la temperatura ocurriendo un incremento después del medio día o al final de la tarde, esto en Viçosa, Brasil.…”

Section: Moment Of Pollinationunclassified

Características reproductivas de nueve variedades de nochebuena (Euphorbia pulcherrima, Willd. ex Klotzch)

Vargas-Araujo

Andrade-Rodríguez

Villegas-Torres

et al. 2017

Remexca

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ResumenMéxico es el centro de origen de la nochebuena (Euphorbia pulcherrima, Willd. ex Klotzch), no obstante, la producción depende de las variedades generadas en otros países porque no se tienen variedades nacionales. Para el mejoramiento genético de cualquier especie es necesario el estudio de la biología reproductiva. Con base en lo anterior, el objetivo de la presente investigación fue evaluar la reproducción de tres variedades de nochebuena de sol (Belén, Juan Pablo, Amanecer navideño) y seis cultivares de sombra (Freedom, Prestige, Ice punch, Nutcracker white, Sonora White glitter y Burgundy) para definir las bases de métodos de mejoramiento genético. Se determinó la viabilidad del polen mediante tinción con aceto-carmín y germinación de polen; se estudió el horario en que las flores estuvieron receptivas, aplicando una gota de H2O2 sobre el estigma; se establecieron cuatro tratamientos para determinar el tipo de polinización de las plantas de nochebuena. La investigación fue desarrollada en un diseño completamente al azar. Se realizó un análisis de varianza y una prueba de comparación de medias con la prueba Tukey (p≤ 0.05). La viabilidad del polen varió de 68 a 93%. La mayor receptividad del estigma se observó a las 14:00 h. Las variedades de sol podrían fungir como hembras AbstractMexico is the center of origin of the poinsettia (Euphorbia pulcherrima, Willd. ex Klotzch), however, production depends on the varieties generated in other countries because they do not have national varieties. For genetic improvement of any kind study of reproductive biology is necessary. Based on the above, the objective of this research was to evaluate the reproduction of three varieties of poinsettia of sun (Bethlehem, John Paul, Christmas Dawn) and six cultivars of shadow (Freedom, Prestige, Ice Punch, Nutcracker white, Sonora White glitter and Burgundy) to define the bases of breeding methods. The viability of pollen was determined by staining with acetocarmine and pollen germination; the schedule was studied when the flowers were receptive, applying a drop of H2O2 on stigma; four treatments were established to determine the type of pollination of the poinsettia plants. The research was developed in a completely randomized design. An analysis of variance and mean comparison test with Tukey test (p≤ 0.05). Was performed. The viability of pollen varied from 68 to 93%. The greater receptivity of the stigma was observed at 14:00 h. The sun varieties could act as females in a breeding program because of greater viability of pollen, IntroducciónLa nochebuena (Euphorbia pulcherrima, Willd. ex Klotzsch), también conocida como pascua, flor de navidad, estrella de navidad o Poinsettia, es originaria de la región que va desde el norte del estado de Morelos hasta el municipio de Taxco, Guerrero (Trejo et al., 2012). Aunque México es el centro de origen de esta planta, la producción de nochebuena depende de las variedades generadas en otros países. Las nuevas variedades que llegan a México han sido liberadas al menos dos años ante...

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“…These seedlings were obtained after seed germination in distilled water. To break the dormancy, wild poinsettia seeds were immersed in water at ambient temperature for 30 min and then washed in running water for 5 min, according to the modified methodology by Vargas et al (1999). Morning glory seeds were submitted to a chemical scarification with sulfuric acid (H 2 SO 4 P.A.)…”

Section: Initial Growth Bioassaysmentioning

confidence: 99%

Phytotoxic Potential of the Crude Extract and Leaf Fractions of Machaerium hirtum on the Initial Growth of Euphorbia heterophylla And Ipomoea grandifolia

et al. 2019

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Allelopathy is the term used to define any process involving secondary metabolites produced by plants and microorganisms that influence growth and development of agrobiological systems. Currently, it is sought to find allelochemicals of interest and know how to apply them in bio-herbicides to combat weeds. In this study, the effects of the crude leaf extract and fractions of Machaerium hirtum (Vell.) Stellfeld were analyzed on Euphorbia heterophylla L. (wild poinsettia) and Ipomoea grandifolia (Dammer) O’Donell (morning glory), as well as the occurrence of morphoanatomical changes. For this, 0.04 g of the crude extract and fractions were solubilized and diluted (50 mL) to concentrations of 0.1, 0.2, 0.4, and 0.8 g L-1 (m/v). Initial growth tests were performed on Petri dishes containing two paper sheets and seedlings of weed species with the respective treatments, being maintained in a germination chamber for 48 hours at 25 oC. Distilled water was used as a control. Shoot and root length was assessed in the initial growth. The percentage of inhibition was calculated based on the values obtained in the initial growth bioassays. Morphologically altered wild poinsettia seedlings were fixed and sectioned transversely for anatomical analysis. The results indicated significant changes in length, being wild poinsettia seedlings more sensitive when compared to those of morning glory. Morphologically altered seedlings presented root necrosis as the most frequent symptom. Anatomically, parenchymatic cells of the hypocotyl and roots of wild poinsettia seedlings presented smaller and irregularly shaped cells when compared to the control, causing significant reductions in the measured parameters.

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Técnica de cruzamentos controlados em Euphorbia heterophylla L.

Cited by 6 publications

References 3 publications

Inheritance of Resistance to Protoporphyrinogen Oxidase Inhibitor Herbicides in Wild Poinsettia

Inheritance of Resistance to Protoporphyrinogen Oxidase Inhibitor Herbicides in Wild Poinsettia

Características reproductivas de nueve variedades de nochebuena (Euphorbia pulcherrima, Willd. ex Klotzch)

Phytotoxic Potential of the Crude Extract and Leaf Fractions of Machaerium hirtum on the Initial Growth of Euphorbia heterophylla And Ipomoea grandifolia

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