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The Effect of High Temperature on Sprouting and Weight Loss of Two Onion Cultivars

Author(s): B. Baninasab | M. Rahemi

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 1;
Issue: 2;
Start page: 199;
Date: 2006;
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Keywords: Onion bulb | sprouting | storage | temperature

Effects of constant temperatures of 15, 25 and 35°C were investigated on storability of two bulb onions (Allium cepa L.) cvs. Yellow Sweet Spanish and Azarshahr for a period of 90 days. In both cultivars, sprouting of onion bulb is inhibited at high storage temperatures in comparison with low storage temperatures. In onion cvs. Yellow Sweet Spanish and Azarshahr sprouting decreased from 40.3 and 22.3% at 15°C to 3.4 and 1.2% at 35°C, respectively. In both cultivars, growth rate of sprout leaves reached a maximum at 25°C and then decreased. Weight loss in both onion cultivars, increased with increasing temperature and time in storage. However, weight loss varied between the onion cultivars. Decay of bulbs is another limitation of onion storage. The data indicate that high temperatures promote decay during storage. The results showed that although high temperatures inhibited bulb sprouting but due to weight loss is not suitable for long-term storage.
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