Estudos sôbre a conservação de sementes. IX- Ingá

Bacchi, Osny Oliveira Santos

doi:10.1590/s0006-87051961000100035

Cited by 12 publications

(11 citation statements)

References 2 publications

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“…However, he also described a group of species whose seeds showed different characteristics, because a decrease in their moisture content tended to decrease the viability period. Examples of these seeds were described long before the 70's, such as the ones of Hevea (Kidd 1914), Acer (Jones 1920), Inga (Castro & Krug 1951, Bacchi 1961, Theobroma (Zink & Rochelle 1964) and Araucaria (Prange 1964). Professor Roberts divided seeds into two groups: the predictable ones, which he called orthodox, and all the others, he called recalcitrant.…”

Section: Introductionmentioning

confidence: 99%

Do recalcitrant seeds really exist?

Barbedo

Centeno

Ribeiro

2013

Hoehnea

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-(Do recalcitrant seeds really exist?). In the 70's, seeds were divided into two categories: recalcitrant and orthodox. In the 80's, it was necessary to create an intermediate category; from the 90's onwards, a gradient between orthodox and recalcitrant categories has been considered by several authors. Currently, the terms orthodox and recalcitrant are appropriate just for technological purposes, not for scientific studies. It seems that the differences between recalcitrant and orthodox seeds lie only on the maturity stage in which they are detached from the mother plant, the recalcitrant ones in a very immature stage. This implies that little progress should be expected to expand the storability of these recalcitrant seeds with the application of any treatment after harvesting. Efforts shall be focused on amplifying the maturation period of these seeds by keeping them linked to the mother plant until the maturation process has been completed. Key words: conservation, desiccation tolerance, maturation, seed storage RESUMO -(Sementes recalcitrantes realmente existem?). Na década de 1970, as sementes foram divididas em recalcitrantes e ortodoxas. Na década de 1980, foi necessário criar a categoria das intermediárias e, a partir de 1990, um gradiente entre as categorias ortodoxas e recalcitrantes tem sido considerado por vários autores. Atualmente, os termos ortodoxa e recalcitrante são apropriados apenas para fins tecnológicos, não para estudos científicos. As diferenças entre sementes recalcitrantes e ortodoxas parecem residir apenas no estádio de maturidade no qual se desprendem da planta mãe, as recalcitrantes em uma fase muito imatura. Isso implica que pouco progresso deve ser esperado para expandir a capacidade de armazenamento com a aplicação de qualquer tipo de tratamento após a colheita dessas sementes recalcitrantes. Esforços devem ser voltados para ampliar o período de maturidade das sementes, mantendo-as ligadas à planta-mãe até que o processo de maturação tenha sido concluído. Palavras-chave: armazenamento, conservação, maturação, tolerância à dessecação

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Section: Introductionmentioning

confidence: 99%

Do recalcitrant seeds really exist?

Barbedo

Centeno

Ribeiro

2013

Hoehnea

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“…Logo, quanto menor a umidade inicial das sementes maior será o tempo necessário para a germinação. Entre espécies frutíferas, na qual as sementes não apresentam tolerância à dessecação do embrião a baixos conteúdos de umidade (recalcitrantes) (Fonseca & Freire, 2003), pode-se destacar o ingá (Inga edulis), em que as sementes recém-colhidas com umidade de 50% apresentam germinação de 98% e, após 14 dias de armazenamento em sacos de aniagem (recipientes abertos), com a umidade reduzida para 21%, a germinação reduz para 1% (Bacchi, 1961); cupuaçu (T. grandiflorum) em que as sementes com umidade de 58,6% a germinação é 99% e, com redução da umidade para 16,1%, a germinação diminui para 10% (Cruz, 2007); jabuticabeira (Plinia cauliflora), em que as sementes perdem totalmente a viabilidade com teor de umidade próximo a 10% (Danner et al, 2011); nespereira (Eriobotrya japonica Lindl. ), cujas sementes perdem totalmente a viabilidade após 60 dias de armazenamento, quando o grau de umidade atinge valores em torno de 25% (Brasileiro et al, 2011); e uvaia (Eugenia pyriformis Cambess.…”

Section: Resultsunclassified

Biometria e armazenamento de sementes de genótipos de cacaueiro

et al. 2017

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Resumo -Genótipos de Theobroma cacao L. devem ser melhor estudados, para se identificar aqueles que produzem sementes mais desenvolvidas e viáveis após o armazenamento. Objetivou-se com este trabalho estudar a biometria e dois tempos de armazenamento de sementes de genótipos de cacaueiro. A biometria foi avaliada em oito genótipos de cacaueiro (tratamentos). Foram instalados testes de germinação em delineamento inteiramente ao acaso, no esquema fatorial 8 x 2 (genótipos: CCN51, PH16, CEPEC2002, Ipiranga, SJ02, PS1319, TSH1188 e Comum x dois períodos de armazenamento: 0 e dois dias). O genótipo TSH1188 apresentou maior comprimento, relação comprimento/largura, espessura e massa de 100 sementes. A absorção de água das sementes recém-colhidas dos genótipos é lenta, justificada pelos altos teores de água, o que não caracteriza padrão-trifásico. Os teores de água reduziram em média 2,3 vezes nas sementes armazenadas em relação às recém-colhidas. A germinação das sementes recém-colhidas dos genótipos foi de 100%. Após o armazenamento, as sementes do PS1319 apresentaram a menor redução da germinação (39%), enquanto as dos PH16, CEPEC2002 e SJ02 reduziram 96%. A velocidade de germinação foi maior e o tempo médio menor que dois dias nas sementes recém-colhidas do PS1319, indicando serem mais tolerante à dessecação. Sugere-se o uso dos genótipos TSH1188 e PS1319 em programas de melhoramento genético. Biometrics and storage of cocoa seeds genotypesAbstract -Genotypes of Theobroma cacao L. should be further studied to identify those that produce more developed and viable seeds after storage. The objective of this work was to study biometrics of cacao seeds genotypes and two periods of seed storage. Seeds biometrics were evaluate in eight cacao genotypes (treatments). Germination tests were carried out in completely randomized design in a factorial 8 x 2 (genotypes: CCN51, PH16, CEPEC2002 Ipiranga, SJ02, PS1319, TSH1188 and Comum x two periods of storage: 0 and two days). TSH1188 showed higher length, length/width, thickness and weight of 100 seeds. Water absorption of freshly harvested seed of the genotypes is slow, justified by the high water content, which does not characterizes standard features. Water levels were reduced on average 2.3 times in stored seeds compared to freshly picked. Germination of freshly harvested seeds of any genotype was 100%. However, after storage, PS1319 seeds showed the least reduction in germination (39%), whereas PH16, CEPEC2002 and SJ02 reduced 96%. Germination rate was higher, and average time less than two days in freshly harvested seeds of PS1319, indicating tolerance to desiccation. It is suggested the inclusion of genotypes TSH 1188 and PS1319 in breeding programs seeds.

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“…Embryos harvested in 2011 which could be associated with their deterioration (Parisi et al 2013). According to Bacchi (1961) and Berjak and Pammenter (2013), the high water content, which is necessary to preserve the viability of recalcitrant seeds, is also favorable for the development of fungi during seed storage.…”

Section: Discussionmentioning

confidence: 99%

Fungicide and drying effects on the viability of recalcitrant seeds of Inga vera subsp. affinis

Parisi

Biagi

Medina

et al. 2016

Trop. plant pathol.

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Studies on the health and quality of seeds from native tree species are scarce in the tropics, which is the case of Inga vera, a recalcitrant-seeded Brazilian species used in reforestation. In this study a series of experiments were conducted to analyze the effects of fungicides and hydration levels on the suppression of seed borne fungi and seed physiology. Firstly, three commercially available fungicide formulations (thiram, carbendazim + thiram and carboxin + thiram) for seed treatment were evaluated. Secondly, embryos were subjected to a combination of four drying levels (62, 52, 44 e 34 % water content) with or without fungicide (carbendazim + thiram). All three preliminary screened fungicide formulations were not phytotoxic, with carbendazim + thiram performing best. Seed deterioration was associated with a high incidence of fungi at any level of drying. Fungicide treatment reduced the incidence of the most common fungi (Acremonium curvulum and Phomopsis diachenii) and extended the lifespan of non-dried embryos from 90 to 120 days.

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Estudos sôbre a conservação de sementes. IX- Ingá

Cited by 12 publications

References 2 publications

Do recalcitrant seeds really exist?

Do recalcitrant seeds really exist?

Biometria e armazenamento de sementes de genótipos de cacaueiro

Fungicide and drying effects on the viability of recalcitrant seeds of Inga vera subsp. affinis

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