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ISHS Acta Horticulturae 1143: VII International Symposium on Edible Alliaceae

The effects of seed moisture content and regional storage temperature on the longevity of two onion cultivars

Authors:   I. Demir, F. Kara, E. Ozden, M. Hassanzadeh
Keywords:   germination, seed storage, half viability period, survival curves
DOI:   10.17660/ActaHortic.2016.1143.48
Abstract:
Onion seeds are short-lived species in storage. This study was designed to test two onion cultivars ('Texas Early Grano' (TEG) and 'Banka') seed storage under different temperatures derived from the monthly mean values in five different regions of Turkey over 28 months with 7, 8, 9, 10, 11, and 12% seed moisture content. Every four months, samples were removed and seed germination was tested. Longevity differences were compared by changes in P50 (the time to germination reduced to 50%). The longest longevity and highest P50 values were obtained in Central Anatolia and the Black Sea and the shortest longevity was observed in the southeastern region of Turkey. The highest P50 values were 17.5 and 17.9 months in TEG, and 23.6 and 23.8 months in the 'Banka' cultivars. P50 values declined to 11.7 months in TEG and 13.8 months in 'Banka' cultivars in the southeastern region, respectively. Overall, the best longevity was seen in seeds stored at 7% moisture content, and 'Banka' had longer P50 values than those of the TEG cultivar. In any region, the best storage can be drying seeds to 7% and storing seeds in ambient conditions no longer than 4-6 months.

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