Condicionamento osmótico de sementes de hortaliças: potencialidades e implicações.

Nascimento, W. M. O. do

doi:10.1590/s0102-053619980000200002

Cited by 53 publications

(40 citation statements)

References 39 publications

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“…Hales Best Jumbo, were purchased from Feltrin Co. Ltd. and submitted to priming in 0.35M KNO 3 . During priming, the seeds were maintained under continuous aeration at 20 °C in the dark for six days (Nascimento, 2004). The primed seeds were then washed twice with distilled water and dried to original moisture content (7.0%) through different treatments before performing germination tests.…”

Section: Plant Materials and Primingmentioning

confidence: 99%

“…For tomato, carrot and asparagus seeds, beneficial effects of priming were observed only for low-vigor seeds (Alvarado;Bradford, 1988a;1988b;Cantliffe;Elballa, 1994;Bittencourt et al, 2004). Priming of melon seeds increased germination performance in seeds of with low vigor (Nascimento, 2004).…”

Section: Measurements Of the Germination Processmentioning

confidence: 99%

“…Priming of melon seeds with KNO 3 (potassium nitrate) was observed to improve germination rate, germination speed, homogeneity of plants and invigoration (Nascimento;Aragão, 2002). However, primed melon seeds cannot be stored due to their high moisture, requiring them to be adequately dried before storage (Butler et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…But this subsequent drying can reduce or eliminate the priming benefits as a consequence of germination having advanced to a state of lost desiccation tolerance (Sliwinska;Jendrzejczak, 2002), making them more susceptible to damage during dry storage (Powell et al, 2000). The temperature and duration of drying after priming affected the vigor and viability of melon seeds (Nascimento;West, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Cross-Tolerance Mechanism Induction in Melon Seeds by Priming Prior Drying

et al. 2015

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The loss of benefits after re-drying is one of the drawbacks of the seed priming technique. Different types of stresses have been used before re-drying to preserve the priming benefits. This process may be seen as promoting cross tolerance to increase the defense mechanisms that prevent loss of viability in seeds primed after drying. We tested the effect of some stresses to induce cross-tolerance and different drying conditions with the aim of maintaining priming benefits in melon seeds. The seeds were primed in an aerated KNO 3 solution (0.35M), -1.7MPa, 25 °C, in the dark for six days. The primed seeds were then submitted to slow drying, fast drying, cold shock + slow drying, cold shock + fast drying, heat shock + slow drying, heat shock + fast drying, PEG + slow drying, PEG + fast drying, ABA + slow drying, ABA + fast drying and no drying (planted directly after priming). We evaluated antioxidant enzyme activities (SOD, CAT and APX), germinability, mean time of germination (MTG) and mean rate of germination (MRG). A completely randomized design was used with three repetitions of 50 seeds in each treatment. Data were analyzed by ANOVA and means were compared by the Scott-Knott test (p ≤ 0.05). ABA increased SOD activity after drying and CAT activity was reduced by priming. APX activity was not observed. The stress submission prior to re-drying improved the MRG and reduced MTG. Therefore, the induction of the cross-tolerance mechanism could be effective to maintain priming benefits in melon seeds.Index terms: PEG; priming; dry seeds; antioxidant system. RESUMOA perda dos benefícios do condicionamento, após a ressecagem, é um dos problemas do condicionamento. Para conservar os benefícios, têm sido utilizados diferentes estresses antes da secagem. Esse processo poderia agir como tolerância cruzada, aumentando os mecanismos de defesa, prevenindo a perda de viabilidade em sementes condicionadas após a secagem. Assim, testou-se o efeito de estresses, na tentativa de induzir tolerância cruzada, após diferentes secagens, mantendo os benefícios do condicionamento em sementes de melão. Dessa forma, as sementes foram condicionadas em solução aerada de KNO 3 (0,35M), -1,7 MPa, 25 °C, no escuro, por seis dias. Depois disso, foram submetidas à secagem lenta, rápida, choque de frio + secagem lenta e rápida, choque de calor + secagem lenta e rápida, PEG + secagem lenta e rápida, ABA + secagem lenta e rápida e sementes sem secagem. As sementes não condicionadas foram o controle. Foi avaliada a atividade das enzimas SOD, CAT e APX, germinabilidade, tempo médio de germinação e taxa média de germinação. O delineamento experimental utilizado foi inteiramente casualisado (DIC) com três repetições, contendo 50 sementes para cada tratamento. Para a análise estatística dos dados, foi utilizado ANOVA e as médias comparadas pelo teste de Scott-Knott (p ≤ 0,05). A aplicação de ABA aumentou a atividade da SOD após a secagem e o condicionamento reduziu a atividade da CAT. O estresse inicial, antes da secagem, aumentou-a e reduziu o...

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Section: Plant Materials and Primingmentioning

confidence: 99%

Section: Measurements Of the Germination Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cross-Tolerance Mechanism Induction in Melon Seeds by Priming Prior Drying

et al. 2015

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“…In pepper (Capscum annum L.), showed that pretreatment with acetylsalicylic acid and salicylic acid resulted in greater uniformity of germination and establishment of seedlings under high salinity. Additionally, ethylene was used to minimize the effect of high temperatures on seed germination of lettuce (Lactuca sativa L.) (Nascimento 2004). In the present study, we aimed to investigate whether hormone priming alters the physiological responses of the economically important pigeon pea (Cajanus cajan L. Mill sp -Fabaceae), when grown under Cd stress.…”

Section: Introductionmentioning

confidence: 99%

Effects of hormonal priming on seed germination of pigeon pea under cadmium stress

Sneideris

Gavassi

Campos

et al. 2015

An. Acad. Bras. Ciênc.

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In this work we investigated whether priming with auxin, cytokinin, gibberellin, abscisic acid and ethylene, alters the physiological responses of seeds of pigeon pea germinated under water and cadmium stress. Seeds treated with water or non-treated seeds were used as control. Although compared to non-treated seeds we found that the hormone treatments improve the germination of pigeon pea under cadmium stress, however, these treatments did not differ from water. However, we also observed a trend of tolerance to the effects of cadmium in the presence of ethylene, suggesting that the use of this hormone may be an efficient method to overcome seed germination under metal stress.

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Storage performance of primed bell pepper seeds with 24‐Epibrassinolide

Silva

Marcos-Filho

2020

Agronomy Journal

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Seed response to priming with 24-epibrassinolide (24-EpiBL) has been studied to investigate the effects on speed of germination, often leading to improved stand establishment. However, knowledge about the response of primed seeds treated with 24-EpiBL during storage remains insufficient. This research was performed to verify the effects of bell pepper seed priming (Capsicum annuum L.) with 24-EpiBL after storage. Two cultivars (AF-6 and AF-7) were used, represented respectively by three and four seed lots of different physiological potential. All lots were stored for 0, 3, 6, 9, and 12 mo after priming with 24-EpiBL. Seeds were evaluated for germination and vigor (germination first count; saturated salt accelerated aging, and using the Seed Vigor Imaging System); unprimed seeds represented the control. Priming with 24-EpiBL promoted positive effects on germination speed, seed tolerance to heat stress, and initial development of seedlings with responses being more evident in lower vigor seed lots. The beneficial effects of priming with 24-EpiBL in bell pepper seeds is maintained after storage, but may gradually decrease after longer storage period.

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Condicionamento osmótico de sementes de hortaliças: potencialidades e implicações.

Cited by 53 publications

References 39 publications

Cross-Tolerance Mechanism Induction in Melon Seeds by Priming Prior Drying

Cross-Tolerance Mechanism Induction in Melon Seeds by Priming Prior Drying

Effects of hormonal priming on seed germination of pigeon pea under cadmium stress

Storage performance of primed bell pepper seeds with 24‐Epibrassinolide

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