Recovery of onion seeds treated by thermotherapy and submitted to osmoconditioning
The objective of this study was to analyze the use of osmoconditioning in improving seed performance of two onion seed lots treated by thermotherapy to control Fusarium oxysporum f. sp. cepae (Hans.) Snyder e Hans. Seeds from two onion cultivars ('Conquista' and 'Beta Cristal') infested by the fungus F. oxysporum f. sp. cepae, were treated by thermotherapy using hot water (60°C). The seeds were also submitted to osmoconditioning, using an aerated solution of PEG 6000 (30%) under constant light for 10 days. The seed recovery was evaluated through seed germination and seedling emergence. The hot water treatment reduced fungus infestation but also reduced seed germination and vigour. Seed osmoticconditioning restored the physiological seed quality. In conclusion, thermotherapy may be used to reduce Fusarium infestation of onion seeds and osmoconditioning to improve seed quality submitted to the treatment.
Silva, P.P., Freitas, R.A. and Nascimento, W.M. (2018). Recovery of onion seeds treated by thermotherapy and submitted to osmoconditioning. Acta Hortic. 1204, 133-138
Allium cepa, osmoconditioning, physiological quality, thermotherapy