Responses of non-primed or primed seeds of ‘Marketmore 76’ cucumber (Cucumis sativus L.) slurry coated with Trichoderma species to planting in growth media infested with Pythium aphanidermatum

Pill, Wallace G.; Collins, C.M.; Goldberger, B.; Gregory, Nancy

doi:10.1016/j.scienta.2009.01.004

Cited by 38 publications

(24 citation statements)

References 30 publications

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“…Observou-se, portanto, que efeitos benéficos do condicionamento osmótico podem ser alterados pela duração do tratamento, o que corrobora com resultados obtidos anteriormente para sementes de mamão (Dias et al, 2012) e maxixe (Reis et al, 2013), cujo condicionamento reduziu a germinação e o desempenho das sementes à medida que se aumentou o período de condicionamento. Segundo Pill et al (2009), esse efeito deletério na germinação está, provavelmente, associado ao alto peso molecular do PEG que, para sua utilização, necessita de um sistema de aeração artificial durante o condicionamento, pois a solubilidade do oxigênio é inversamente proporcional à concentração do soluto.…”

Section: Methodsunclassified

Condicionamento osmótico na qualidade fisiológica de sementes de cebola

Pereira¹,

Aspiazú²,

Torres³

et al. 2014

RCA

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RESUMO: Na cultura da cebola, são constantes os problemas relativos ao desempenho das sementes no campo, justifi cando-se o uso de técnicas que aumentem a porcentagem de germinação das sementes e a emergência das plântulas. O objetivo deste trabalho foi avaliar o efeito do condicionamento osmótico em sementes de cebola com nitrato de potássio e polietileno glicol 6000 em diferentes concentrações e períodos de condicionamento. Para tanto, sementes da cv. Baia Periforme foram condicionadas em soluções de PEG 6000 a 0,8 e -1,0 MPa e KNO 3 a 0,25 e 0,35 mol L -1 por quatro 0, 24, 48, 96 e 144 h, a 20 °C. A seguir, as sementes condicionadas ou não foram avaliadas por meio dos testes: de germinação, primeira contagem de germinação, emergência das plântulas, índice de velocidade de emergência e comprimento de plântula. Verifi cou-se que o condicionamento osmótico em PEG 6000 e KNO 3 por 48 h foi efetivo em aumentar a porcentagem e a velocidade de germinação, bem como a emergência das plântulas. Para o crescimento de plântula, o condicionamento osmótico em solução de PEG 6000 a -0,8 MPa foi superior aos demais tratamentos.ABSTRACT: Problems regarding onion seed performance in the fi eld are constant, justifying the use of techniques to accelerate germination and seedling emergence. The objective of this study was to evaluate the effects of four imbibition solutions and different times during priming on onion seed germination and vigor. Seeds of onion, Baia periforme cultivar, were primed in PEG 6000 24, 48, 96 and 144 hours, at 20 °C. The seeds were then submitted to the following tests: germination, fi rst count, percentage and speed of seedling emergence, and seedling length. Priming in PEG 6000 and KNO 3 for 48 h were effective in increasing the percentage and speed of germination and seedling emergence in the fi eld. Regarding seedling length, priming in PEG 6000 at -0.8 MPa solution was superior to the other treatments applied.

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Section: Methodsunclassified

Condicionamento osmótico na qualidade fisiológica de sementes de cebola

Pereira¹,

Aspiazú²,

Torres³

et al. 2014

RCA

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“…) and to protect against damping‐off during seed germination (Pill et al . ). Two major experimental approaches can be identified to study the spermosphere and to understand the interactions between seeds, micro‐organisms and the environment.…”

Section: How Can the Spermosphere Be Studied?mentioning

confidence: 97%

“…Control Pythium aphanidermatum damping‐off on Cucumis sativus seeds (Pill et al . ) and on Beta vulgaris L. seeds (Pill et al . )…”

Section: How Can the Spermosphere Be Defined?mentioning

confidence: 99%

“…In the earlier works, its study and characterization were achieved through germination and/or the growth of various micro-organisms in the immediate environment of the seeds (Stanghellini and Hancock 1971;Lacy 1974, 1976). More recently, these methods are still used to assess the effect of seed treatment containing micro-organisms on improving seed emergence (Bennett et al Increase seed germination from 25Á5 to 72Á11% and disease control from 47Á68 to 76Á00% in different crops (chickpea, pea, soybean and lentil) (Mishra et al 2013) 2009) and to protect against damping-off during seed germination (Pill et al 2009). Two major experimental approaches can be identified to study the spermosphere and to understand the interactions between seeds, microorganisms and the environment.…”

Section: By the Beneficial Effects On Seed Germinationmentioning

confidence: 99%

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A review: what is the spermosphere and how can it be studied?

et al. 2015

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SummaryThe spermosphere is the zone surrounding seeds where interactions between the soil, microbial communities and germinating seeds take place. The concept of the spermosphere is usually only applied during germination sensu stricto. Despite the transient nature of this very small zone of soil around the germinating seed, the microbial activities which occur there may have longlasting impacts on plants. The spermosphere is indirectly characterized by either (i) seed exudates, which could be inhibitors or stimulators of microorganism growth or (ii) the composition of the microbiome on and around the germinating seeds. The microbial communities present in the spermosphere directly reflect that of the germination medium or are hostdependent and influenced quantitatively and qualitatively by host exudates. Despite its strong impact on the future development of plants, the spermosphere remains little studied. This can be explained by the technical difficulties related to characterizing this concept due to its short duration, small size and biomass, and the number and complexity of the interactions that take place. However, recent technical methods, such as metabolite profiling, combining phenotypic methods with DNA-and RNA-based methods, could be used to investigate seed exudates, microbial communities and their interactions with the soil environment.

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“…For marketing as seeds treatment, the microorganisms must be formulated in an appropriate way to ensure efficacy, storability and compatibility with existing agricultural technologies and practises. One way of delivery of micro-organisms to vegetable seed is by adding them during the priming process ('biopriming') (Jensen et al 2007;Bennett et al 2009;Pill et al 2009). Microbial inocula or other natural products are not only added to seeds for technical reasons like plant growth promotion or disease control.…”

Section: Micro-organismsmentioning

confidence: 99%

Non-chemical Seed Treatment in the Control of Seed-Borne Pathogens

Koch¹,

Roberts²

2014

Global Perspectives on the Health of Seeds and Plant Propagation Material

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Non-chemical seed treatments include physical treatments, microbial treatments and treatments with other agents of natural origin like plant powders or extracts. Physical treatments with hot water, aerated steam, or dry heat have successfully been applied to a range of crops against a range of target pathogens and are in commercial use primarily for vegetable seeds. They can be very effective but need to be optimised on a per seed lot basis.Microbial seed treatments may control not only seed-borne pathogens but also provide some protection against pathogenic soil-borne inoculum. However, research on the use of micro-organisms as seed treatments has been limited, and there are only a few examples of commercial use. The latter is also true for botanical seed treatments, despite many reports of bactericidal and fungicidal effects of compounds from plants. The reason may be a lack of research on the one hand but mainly commercial constraints like development and registration costs in relation to market size.The current chapter gives an overview of approaches that have been taken to utilize the above-described non-chemical methods for control of important seedborne pathogens of vegetables and small grain cereals. The examples treated include bacterial (black rot of brassicas, pea bacterial blight, bacterial blotch of cucurbits, black chaff of cereals), fungal (Alternaria diseases of carrot, black leg of brassicas, common bunt of wheat, Fusarium seedling diseases of small grain cereals, the loose smuts of barley and wheat, fungal diseases of rice and sorghum) and important viral diseases.

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Responses of non-primed or primed seeds of ‘Marketmore 76’ cucumber (Cucumis sativus L.) slurry coated with Trichoderma species to planting in growth media infested with Pythium aphanidermatum

Cited by 38 publications

References 30 publications

Condicionamento osmótico na qualidade fisiológica de sementes de cebola

Condicionamento osmótico na qualidade fisiológica de sementes de cebola

A review: what is the spermosphere and how can it be studied?

Non-chemical Seed Treatment in the Control of Seed-Borne Pathogens

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