A liquid preservative (LP), 20% (w/w) CaCl2 in glycerol, was evaluated for its effect on the longevity of seeds of 14 vegetable crops and 12 wild species (moisture contents on fresh weight basis, 9.5 ± 1.2%) in comparison with the same seeds hermetically
stored (HS) at ambient temperature 15-45°C. In HS, vegetable seeds lost 50% viability in 1-3 years and complete loss of viability occurred in 2-4 years. The wild species seeds lost 50% viability in 3-8 years and complete loss of viability occurred in 5-12 years. The LP ultra-dried
the seeds in a month and maintained an air-free environment. Hence, the viability of seeds of grain amaranth, vegetable amaranth and tomato, and of sessile joyweed, lambsquarters and toothed dock was maintained over 21-24 years of ambient temperature storage. In other species, the length of
time over which seed viability was maintained varied. The LP-preserved seeds of six vegetable and two wild species planted in pots outdoors during 2013-2014 formed normal plants and seeds. The performance comparison of these fresh seeds with the LP-preserved seeds in eight species showed decline
in performance of the latter by 21 or 24 years. The LP is recommended as a method for simple, low-input seed storage at ambient temperatures.
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Document Type: Research Article
December 1, 2016
This article was made available online on October 25, 2016 as a Fast Track article with title: "Enhancement of longevity of vegetable crop and wild species seeds at ambient temperature using a liquid preservative".
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