GERMINAÇÃO E REINDUÇÃO DA TOLERÂNCIA À DESSECAÇÃO EM SEMENTES DE &lt;i&gt;Senna multijuga&lt;/i&gt; (RICH.) IRWIN ET BARN

Ribeiro, Diego Egídio; Alvarenga, Amauri Alves de; Martins, J. R.; Rodrigues, A. C.; Maia, Vitor Oliveira

doi:10.5902/1980509825031

Cited by 7 publications

(5 citation statements)

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“…There are alternative methods for ex situ storage of recalcitrant seeds, but specific studies for R. grandis are required for further conclusions. These methods must consider the reduction of metabolism, or induction of desiccation tolerance in sensitive seeds, with the use of PEG (Polyethyleneglycol) and ABA (exogenous abscisic acid) in osmotic solutions, partial dehydration (drying the seed to its lowest possible water amount), which may increase longevity, and also the excision of the embryonic axis followed by cryopreservation (Bonjovani 2011;Ribeiro et al 2016a). Silva-Júnior & Pereira (2009) and Lorenzi (2009) also describe R. grandis germination with rates around 50% when sown soon after harvest.…”

Section: Discussionmentioning

confidence: 99%

Morpho-physiological classification of seeds and morphology of fruits and seedlings of Richeria grandis

et al. 2020

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The objective was to describe and characterize the fruit morphology, seeds, seedlings and germination of Richeria grandis. Mature fruits were collected from matrix trees located in gallery forests. After, morphological descriptions were performed. Biometric measurement of fruits and seeds were carried out. A total of 650 seeds were randomly separated, with 20% being used for germination and humidity testing on the same day of collection and the others stored for 5, 10, 15 and 20 days. The germination test was performed in a gerbox, conducted in a laboratory chamber of the type B.O.D (biochemical oxygen demand) with a photoperiod of 12h and a temperature of 25 ºC ± 1 ºC. Periodic observations were made to monitor the development of the seedlings until the first germinated seeds reached the full seedling stage. The fruit of R. grandis is a simple, dry, capsule type septifraga, dehiscent and schizocarpic, with average length of 16.24 mm and an average width of 8.57 mm. The seed is an ellipsoid shape, containing a sarcotesta and has an average length of 7.40 mm and an average width of 4.57 mm. R. grandis presents recalcitrant seeds, which emerge in a Phanero-epigene-foliaceous manner. The radicle breaks the integument on the second day after sowing, the collection is evidenced on the 10th day, separating the primary root from the hypocotyl. At day 16, the cotyledons expand from the forehead, positioned at a 90º angle to the hypocotyl. The protophyll and the epicotyl appear only after the 50th day, characterizing the complete seedling.

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Section: Discussionmentioning

confidence: 99%

Morpho-physiological classification of seeds and morphology of fruits and seedlings of Richeria grandis

et al. 2020

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“…Bandeira et al (2018) worked with an important weed, Senna obtusifolia, and found that the germination percentage of the species is maximized at the temperature of 25 ºC. For the species Senna multijuga, the temperatures of 30 ºC (constant) and 20-30 ºC (alternating) resulted in the highest germination percentage (Ribeiro et al, 2016). Wang et al (2017) reported that the best temperatures for germination in the species Digitaria sanguinalis were between 25 and 35 ºC.…”

Section: Second Experimentsmentioning

confidence: 99%

“…Londrina, v. 43, n. 6, p. 2785-2802, nov./dez. 2022 alternating temperatures, which correspond to the environmental conditions found in the natural environment (Ribeiro et al, 2016). Fontes et al (2019) evaluated the influence of light and water stress on the germination behavior and vigor of Amaranthus deflexus and found that water stress negatively affects seed performance, reducing germination and vigor, whereas the absence of light completely compromised germination, regardless of the stress level applied.…”

Section: Introductionmentioning

confidence: 99%

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

et al. 2023

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As plantas daninhas competem com as culturas por fatores limitantes do meio em que vivem, portanto, estudos que apontem a resposta germinativa de sementes submetidas a estresses artificiais são importantes para entender a capacidade de sobrevivência e adaptação destas espécies sob condições de estresse naturais. Objetivou-se neste trabalho avaliar o efeito das condições salinas e térmicas sobre a germinação e vigor de sementes de Amaranthus deflexus L. Foram instalados dois experimentos, com semeadura realizada em placas de petri contendo duas folhas de papel de filtro umedecidas com água destilada (controle) ou com soluções de NaCl. No experimento 1 utilizou-se o delineamento experimental inteiramente casualizado (DIC), em esquema fatorial 2 x 6, constituído de dois fotoperíodos (12h luz e 24h escuro) e seis níveis de estresse salino (0; -0,3; -0,6; -0,9; -1,2 e -1,5 MPa), totalizando doze tratamentos, com quatro repetições. Ao final do teste, as sementes que não germinaram foram lavadas e colocadas em substrato papel toalha, umedecido com água para hidratação e estimular o processo germinativo. No experimento 2 utilizou-se um DIC com oito tratamentos (germinação sob 20; 25; 30; 35; 40°C, 20/30; 25/35 e 30/40°C) e quatro repetições cada. O estresse salino afetou negativamente o vigor das sementes de A. deflexus desde o nível de estresse de -0,3 MPa. O vigor das sementes foi comprometido pela ausência de luz, independentemente dos níveis de estresse aplicados. Houve superioridade na percentagem final de germinação e o índice de velocidade de germinação das sementes de A. deflexus na temperatura de 25°C constante e no regime alternado de 25-35°C. O procedimento multivariado discriminou os tratamentos 1 e 2 como superiores no dendograma A, bem como 4, 5 e 6 no dendograma B, configurando-se como método robusto para inferência em experimentos fatoriais sobre o comportamento germinativo.

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“…The ability of seedlings to tolerate water loss to the environment may characterize a high capacity of survival, even in environments with higher water restrictions [11]. In semi-arid environments, such as Caatinga, a seasonally dry tropical forest, rain events at short intervals of time promote deficit conditions in all phases of plant development.…”

Section: Introductionmentioning

confidence: 99%

Influence of desiccation and water deficit on the initial development of seedlings of Tabebuia aurea (Silva Manso) Beth. Hook. and S. Moore (Bignoniaceae)

Santos¹,

Santos

Meiado³

2023

Sci. Plena

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Desiccation tolerance mechanisms are one of the main factors related to the ability to survive water deficit conditions imposed by abiotic stress. Thus, the objective of this work was to evaluate the desiccation tolerance and the influence of water deficit on the initial development of Tabebuia aurea (Silva Manso) Benth. & Hook.f. ex S. Moore. The seedlings were divided into two treatments the control and those that were submitted to 50% desiccation. The control groups received water daily over a period of 30 days, while the groups that underwent water deficit had water suspension for 14 days, totaling two cycles of water deficit over a period of 30 days. The results of this study indicate that seedlings of T. aurea survive desiccation and present less development, whether of the stem, roots, number of leaves, stem diameter when subjected to desiccation and consequent water deficit. Thus, these results indicate that the reduction in early development is related to the perception and attenuation of stressful conditions imposed by the abiotic environment during development.

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GERMINAÇÃO E REINDUÇÃO DA TOLERÂNCIA À DESSECAÇÃO EM SEMENTES DE <i>Senna multijuga</i> (RICH.) IRWIN ET BARN

Cited by 7 publications

References 5 publications

Morpho-physiological classification of seeds and morphology of fruits and seedlings of Richeria grandis

Morpho-physiological classification of seeds and morphology of fruits and seedlings of Richeria grandis

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

Influence of desiccation and water deficit on the initial development of seedlings of Tabebuia aurea (Silva Manso) Beth. Hook. and S. Moore (Bignoniaceae)

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