Avaliação da qualidade de sementes de fumo, nuas e revestidas, pelo teste de condutividade elétrica

Carvalho, Cristiane de; Novembre, Ana Dionisia da Luz Coelho

doi:10.1590/s0101-31222011000100020

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…O uso de sementes pelotizadas pode ter alguns problemas, pois a pelota formada ao redor da semente pode afetar seu desempenho durante a germinação (CARVALHO & NOVEMBRE, 2011). Isso devido ao arranjo das partículas finas da pelota o que dificulta a emissão da raiz primária e a troca de gases, causando geralmente atraso no processo de germinação (SILVA et al, 2002;NASCIMENTO et al, 2009).…”

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Qualidade de sementes de tabaco durante o processo de pelotização e armazenamento

et al. 2016

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Qualidade de sementes de tabaco durante o processo de pelotização e armazenamento

et al. 2016

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“…These treatments may have damaged the cell membrane, causing higher leaching of electrolytes. More deteriorated and less vigorous seeds, when subjected to imbibition, leach higher amounts of solutes (sugars, amino acids, fatty acids, proteins, enzymes and ions) to the external medium due to the lower repair speed of the cell membrane (Carvalho and Novembre, 2011).…”

Section: Resultsmentioning

confidence: 99%

Sodium hypochlorite in the priming of tobacco seeds

et al. 2019

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Due to the non-uninform maturation of tobacco fruits and seeds, the priming technique has been used by the tobacco industry as a way of increasing the uniformity and germinations peed of seeds. Several factors can affect priming, including the time and environment in which the treatment is performed. In order to evaluate the effect of sodium hypochlorite as priming agent at different concentrations and the priming period on the physiological quality of the tobacco seeds, it was used a seed lot of commercial cultivar CSC 439 from the Virginia varietal group, widely used by the producing companies. The seeds were subjected to priming in aerated solution at different priming periods (180, 60, 30, 15, and 5 min) and concentrations of sodium hypochlorite (1%, 0.50%, 0.25%, and 0.10 %). The physiological quality was evaluated by the water contents, germination tests, first count, germination index, initial and final stands, emergence index and electrical conductivity. The priming with sodium hypochlorite did not affect germination, but allowed a higher percentage and speed of emergence when using the 1% concentration for 180, 30 and 15 min.

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“…Results obtained for T 50 also showed high vigor for seeds in that stage when compared to the other stages. Carvalho and Novembre (2011) have reported low efficiency in the germination and first count tests in quality distinction between different lots of tobacco seeds compared to the emergence test. In their study, the emergence test allowed the classification of lots at different vigor levels.…”

Section: Discussionmentioning

confidence: 99%

Research Article Morphological, physiological, and biochemical indicators of quality in tobacco fruits and seeds

Andrade¹,

Silva²,

Carvalho³

et al. 2018

Genet. Mol. Res.

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Morphological or isozyme markers related to physiological maturation and deteriorative processes are important in the evaluation of seed quality. Two experiments were conducted to examine the possibility of using isozymes as indicators of quality in tobacco seed lots and fruit appearance as an indicator of physiological maturity in tobacco cultivars, based on the physiological and biochemical changes of the seeds. Cultivars CSC 444 and CSC 221 of tobacco fruits were harvested at various maturity stages and their physiological quality was assessed by germination, first count, germination speed index, time to reach 50% germination, cumulative average germination, and seedling emergence. We also assessed the activity of catalase (EC 1.11.6.1-CAT), esterase (EC 3.1.1.1-EST), isocitrate dehydrogenase (EC 1.1.1.41-IDH), malate dehydrogenase (EC 1.1.1.37-MDH), alcohol dehydrogenase (EC 1.1.1.1-ADH), endo-β-mannanase (EC 3.2.1.78), and heat-resistant proteins during the process of maturation. Six lots of cultivar CSC 444 were used to differentiate the quality levels between the lots, and their characterization was determined by germination and vigor tests. In addition, we evaluated the enzymatic activity of CAT, EST, ADH, MDH, and heat-resistant proteins. During maturation of the fruits from the partially dark stage, we observed a progressive increase in germination and seed vigor. We concluded that appearance of the ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 17 (4): gmr18058 D.B. Andrade et al 2 fruit is an indicator of fruit maturity and quality in tobacco seeds. The enzymatic profile of ADH matches the physiological potential of the seeds, based on germination and emergence tests. Thus the ADH enzyme indicates the optimum stage to harvest fruits. In the EST and CAT enzymatic pattern analysis, we observed higher activity of these enzymes in lots with lower physiological quality. So the CAT and EST enzymes are biochemical indicators that can assess the deterioration of tobacco seed lots.

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Avaliação da qualidade de sementes de fumo, nuas e revestidas, pelo teste de condutividade elétrica

Cited by 8 publications

References 17 publications

Qualidade de sementes de tabaco durante o processo de pelotização e armazenamento

Qualidade de sementes de tabaco durante o processo de pelotização e armazenamento

Sodium hypochlorite in the priming of tobacco seeds

Research Article Morphological, physiological, and biochemical indicators of quality in tobacco fruits and seeds

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