1998
DOI: 10.1590/s0103-90161998000500023 View full text |Buy / Rent full text
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Abstract: The basis of differences in seed quality are described for two groups of crops, grain legumes and vegetables and approaches to the improvement of quality are proposed. In grain legumes the major factors affecting seed quality are imbibition damage, seed ageing and their interaction. It is proposed that use of seed vigour tests, specifically the electrical conductivity test, to identify the incidence of imbibition damage and ageing allows the selection of seed lots for sale and for use under different field con… Show more

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“…According to Masetto et al (2014) priming in Psidium guinea seeds showed an increase in germination, root growth and reduction in the average time for germination. Differences in the effects produced by priming seeds with different vigor levels, reinforces the statement that responses of seeds submitted to osmopriming are more intense for lots which have begun deterioration process, however are not yet utterly deteriorated (Powell, 1998).…”
Section: Resultssupporting
“…A hidratação controlada vem sendo utilizada em sementes de leguminosas (Powell 1998) e pode ser efetuada mediante exposição dessas sementes a determinadas condições da atmosfera, embebição em substrato úmido ou imersão em soluções osmóticas, podendo ser realizada continuamente até níveis programados de hidratação (Carvalho et al 2000). A imersão em soluções osmóticas com potencial hídrico conhecido permite, ainda, estimar o potencial hídrico de sementes e embriões (Pammenter et al 2002, Sun 2002.…”
Section: Introductionunclassified
“…An intact testa acts as a barrier to diffusion and thus restricts water uptake. Removal or injury to the testa permits an increased velocity of water uptake in the outer cells of the cotyledons, resulting in membrane damage to cotyledonary cells and solute leakage from the embryos (Bewley and Black, 1978;Powell, 1998). Imbibition damage has been reported in several other legumes following injury or removal of the testa (Pollock and Toole, 1966;Powell, 1998;Powell and Matthews, 1978).…”
Section: Resultsmentioning
“…However, it is not known if primed seeds can be stored at freezing temperatures or dried back to TMC levels for future use without adversely affecting seed quality and the benefits of pretreatment [34]. It might also have been possible to increase the MC of the TMC seeds to FI levels for priming, but this was not investigated.…”
Section: Experiments 2 Primingmentioning
“…A hidratação controlada vem sendo utilizada em leguminosas como método de pré-condicionamento (envigoramento), tanto para sementes deterioradas (envelhecidas) como para sementes altamente sensíveis aos danos durante a embebição rápida, ou interação entre ambos, objetivando melhorar o desempenho destas (Powell, 1998). A hidratação lenta pode ainda ser seguida de secagem, se as sementes não tiverem atingido a fase III da germinação, facilitando o subsequente manuseio, armazenamento e semeadura com equipamentos convencionais (Copeland & McDonald, 1995).…”
Section: Introductionunclassified