Germination, vigour and dormancy of sunflower seeds following chemical desiccation of female plants

Szemruch, Cyntia Lorena; Rentería, Santiago; Moreira, Fatima M. de S.; Cantamutto, Miguel Ángel; Ferrari, Liliana Edith; Rondanini, Deborah Paola

doi:10.15258/sst.2014.42.3.12

Cited by 14 publications

(16 citation statements)

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“…The latter is the inhibition of germination by the structures that surround the embryo (i.e. the fruit 'envelopes'), which include the single-layered endosperm, the seed coat (which is dead at maturity) and the pericarp (Seiler, 1997;Szemruch et al, 2014). At harvest maturity, the sunflower embryo usually presents low or intermediate levels of dormancy, whereas the achene is deeply dormant as a result of strong 'envelope-imposed' dormancy.…”

Section: Introductionmentioning

confidence: 99%

Effect of storage temperature on dormancy release of sunflower (Helianthus annuus) achenes

Rodríguez

Bodrone²,

Castellari

et al. 2018

Seed Sci. Res.

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Published information regarding the effect of storage temperature on dormancy alleviation of sunflower achenes is contradictory and ambiguous. In the present study we explored the effect of temperature during dry storage on dormancy release in two sunflower genotypes, including a commercial hybrid and an inbred line. Dry storage at 25°C consistently accelerated dormancy release of achenes compared with 5°C. This response fits the general pattern reported for dry after-ripening in seeds of many other species. Depending on the genotype and the dormancy factor prevailing, higher temperature alleviated embryo dormancy and coat-imposed dormancy. Hormonal pathways involved in these changes were investigated at the physiological level. In both genotypes, sensitivity to abscisic acid (ABA) was reduced by storage at 25°C. Also, but only in one genotype, storage at 25°C reduced ABA levels upon imbibition and increased the response to a gibberellin (GA) synthesis inhibitor and to applied GA3, compared with storage at 5°C; these results support the idea that temperature affects both ABA and GA metabolism and signalling pathways during after-ripening. This information will be useful to define storage conditions for commercial sunflower achenes, and will also help focus future research on the underlying mechanisms of dormancy release during dry after-ripening in sunflower.

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Section: Introductionmentioning

confidence: 99%

Effect of storage temperature on dormancy release of sunflower (Helianthus annuus) achenes

Rodríguez

Bodrone²,

Castellari

et al. 2018

Seed Sci. Res.

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“…If achenes are dried and stored at room temperature (25 ± 1°C, relative humidity 50%) embryo dormancy is removed (Corbineau et al, 1990; Andrade et al, 2015); however, coat‐imposed dormancy may persist for several weeks and even months (Benech‐Arnold, 2004). “Coat” refers to any embryo‐covering tissue, for example the pericarp, seed coat, or endosperm (Finch‐Savage and Leubner‐Metzger, 2006; Szemruch et al, 2014). The sunflower achene consists of a seed and adhering pericarp, and the seed consists of a seed coat, endosperm and embryo (Seiler, 1997).…”

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confidence: 99%

Pericarp‐Imposed Dormancy in Sunflower: Physiological Basis, Impact on Crop Emergence, and Removal at an Industrial Scale

et al. 2016

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Sunflower (Helianthus annuus L.) achenes often display pericarp‐imposed dormancy, which is long‐lasting and causes serious problems to crop production and the seed industry. For this study we assessed an extensively used sunflower inbred line that has this type of dormancy. Our goals were (i) to determine the effect of pericarp on germination and to evaluate its impact on crop field emergence, (ii) to provide insight into the physiological basis of pericarp‐imposed dormancy by determining the effects of abscisic acid (ABA) accumulation in the embryo and the embryo sensitivity to ABA during incubation at different temperatures, (iii) to assess the effect of oxidant agents and other compounds on dormancy termination, and (iv) to evaluate the feasibility of using oxidants to remove dormancy at an industrial scale. Incubation at high temperatures (i.e., 25 to 30°C) allowed the expression of dormancy, which was imposed by the pericarp and was accompanied by an increase in embryo sensitivity to ABA, but not in ABA concentration. Treated achenes with sodium hypochlorite, or their incubation in presence of an ethylene precursor or gibberellins overcame dormancy. ABA concentration decreased during incubation when treated with sodium hypochlorite. Application of sodium hypochlorite on a commercial seed lot (i.e., washing with 3 and 7%, after additional chemicals used by the industry were applied) resulted in higher germination compared with dormant non‐treated controls. Field trials showed that pericarp‐imposed dormancy reduced crop emergence in the inbred line tested herein. However, treating achenes with sodium hypochlorite using described industrial procedures improved field emergence.

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“…The EC and TZ-V test reflected seed filling variations (Table 1) showing the lowest seed vigor in the latest sowing date in 2011. On this sowing date the seed growth period was exposed to high temperatures (Szemruch et al, 2014) which may have affected seed vigor at harvest time. Similar effects of growing field conditions on seed vigor have been observed in soybean, wheat, barley and groundnut (Egli et al, 2005;Samaraha and Alqudaha, 2011;Hasan et al, 2013;Sharma et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…Laboratory tests: Seed conditioning: dehulled seeds (without pericarp) and decoated seeds (without pericarp and without seed coat) were obtained by manual removal according to Braz et al (2008) and Szemruch et al (2014), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Braz et al (2008) and Oliveira et al (2012) increased the predictive value of the conductivity test using the dehulled procedure of sunflower seeds. Due to their selective permeability, pericarp and seed coat removal could be considered as an effective way to break seed dormancy in sunflower (Szemruch et al, 2014). Thus, the electrical conductivity test using dehulled sunflower seeds, seems useful in order to overcome interferences from the pericarp electrolytes and seed dormancy.…”

Section: Introductionmentioning

confidence: 99%

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Ranges of Vigor Based on the Electrical Conductivity Test in Dehulled Sunflower Seeds

Szemruch¹,

Longo²,

Ferrari³

et al. 2015

Research J. of Seed Science

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Electrical Conductivity (EC) is a promising vigor test since it produces fast laboratory results. In sunflower, the leakage of electrolytes from the pericarp may interfere with exudates from embryo tissues. The aims of this work were (1) To determine the utility of the EC test using dehulled (without pericap) sunflower seeds to evaluate the vigor in different genotypes, exposed to contrasting seed filling period and storage conditions, (2) To explore the relationship between EC and germination values near post harvest and across storage period and (3) To propose ranges of vigor through EC, so as to categorize sunflower seeds lots. Seeds of commercial hybrids differentiated by acid composition (high and standard oleic acid), exploring contrasting seed filling period and storage conditions, were evaluated by EC, Tetrazolium (TZ-V) and Germination (G), near post harvest time and during storage period (1, 5, 9, 13 and 19 months). An independent set of 18 genotypes, stored during 1-108 months, were also analyzed for EC and G. Electric conductivity in dehulled seeds was effective to identify vigor differences of genotypes in different seed filling period and storage conditions. A general relationship between the loss of germination and vigor was established for sunflower. The ranges of vigor based on EC proposed for sunflower seeds classification were <70 µs cmG 1 gG 1 for high, 70-110 µs cmG 1 gG 1 for intermediate and >110 µs cmG 1 gG 1 for low vigor levels. It is the first report based on EC ranges to categorize the seed vigor of sunflower seeds lots.

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Germination, vigour and dormancy of sunflower seeds following chemical desiccation of female plants

Cited by 14 publications

References 0 publications

Effect of storage temperature on dormancy release of sunflower (Helianthus annuus) achenes

Effect of storage temperature on dormancy release of sunflower (Helianthus annuus) achenes

Pericarp‐Imposed Dormancy in Sunflower: Physiological Basis, Impact on Crop Emergence, and Removal at an Industrial Scale

Ranges of Vigor Based on the Electrical Conductivity Test in Dehulled Sunflower Seeds

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