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Germplasm conservation strategies – impact of conditioning on the viability of dry pearl millet seeds

OAR@ICRISAT

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Relation http://oar.icrisat.org/4710/
http://ejournal.icrisat.org/Volume9/Sorghum_Millets/Germplasm_millet.pdf
 
Title Germplasm conservation strategies – impact of conditioning on the viability of dry pearl millet seeds
 
Creator Sastry, D V S S R
Upadhyaya, H D
Gowda, C L L
 
Subject Millets
 
Description Seed deterioration is a continuous process and
conservation of germplasm in ex-situ facilities necessitates
techniques that prolong seed longevity. A combination of
3–7% seed moisture content (mc) and a storage
temperature below 0°C is suitable for long-term
preservation of orthodox seeds (FAO/IPGRI 1994).
When seeds of different crops are dried to low moisture
levels, there is a decrease in weight and volume and when
large seeds dry too rapidly, the outside of the seed loses
moisture more rapidly than the inside of the seed and it
reduces in volume more quickly leading to cracking of
the seed coat (Ellis et al. 1985). Internal drying stresses
also increase susceptibility of seeds to mechanical
injuries and the dryness of seeds is also critical to the
occurrence of imbibition injury (Ellis et al. 1990).
Imbibition injury occurs in standard germination tests of
very dry seeds, even when the germination medium is of
low osmotic potential. In addition to legume seeds,
problems of imbibition injury have been encountered with
forage legumes, cotton and sorghum (Sorghum vulgare)
(Ellis et al. 1985). Imbibition injury to seeds depends on
several factors such as seed maturation, age, mc and
storage temperature (Powell and Matthews 1979, Tully et
al. 1981, Taylor and Prusinski 1990). Imbibition injury to
seeds is a potential problem for genebanks handling
germplasm samples of very dry seeds especially in
meeting the requirements for long-term storage. A critical
mc below which a constant proportion of seeds fail to
germinate as a result of imbibition injury and the
susceptibility of very dry seeds to imbibition damage has
been reported by Ellis (1987) and Ellis et al. (1990).
 
Publisher International Crops Research Institute for the Semi-Arid Tropics
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4710/1/Germplasm_conservation_strategies_2011.pdf
Sastry, D V S S R and Upadhyaya, H D and Gowda, C L L (2011) Germplasm conservation strategies – impact of conditioning on the viability of dry pearl millet seeds. Journal of SAT Agricultural Research, 9. 4pp. ISSN 0973-3094