Desiccation tolerance acquisition in developing beech (Fagus sylvatica L.) seeds: the contribution of dehydrin-like protein |
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Authors: | Ewa M Kalemba Franciszek Janowiak Stanis?awa Pukacka |
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Institution: | (1) Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62-035 Kórnik, Poland;(2) Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Kraków, Poland |
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Abstract: | The acquisition of desiccation tolerance (DT) in developing beech (Fagus sylvatica L.) seeds and the role of a dehydrin protein in this process were investigated. DT was determined by measurement of electrolyte
leakage and germination capacity after drying to 10–12% moisture content (MC). In addition to mass maturity, the presence
of heat-stable proteins, dehydrin accumulation and the peak of ABA content were measured in relation to the acquisition of
DT. Mass maturity was achieved at 16 weeks after flowering (WAF). The germination capacity increased from 8% at 12 WAF to
80–90% after 16 WAF. Cell membrane integrity, measured as a decrease in electrolyte leakage after desiccation, was acquired
at 16 WAF. Additionally, the ratio of heat-stable to soluble proteins was the highest at 16 WAF. One dehydrin-like protein
with a molecular mass 44 kDa, named DHN44, was detected in embryonic axes at 16 WAF and in cotyledons at 17 WAF, and its gradual
accumulation was observed in mature seeds. With regard to the acquisition of DT, the strongest correlations were detected
between electrolyte leakage, DHN44 accumulation, and the percentage of heat-stable proteins. These results suggest that developing
beech seeds become tolerant to desiccation at 16 WAF. The effect of desiccation and ABA treatment on DHN44 synthesis was tested
before (14 WAF) and after the DT acquisition (18 WAF). Depending on the maturation stage desiccation and ABA treatment can
induce or enlarge DHN44 expression. |
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Keywords: | Abscisic acid Beech Dehydrin Desiccation tolerance Seed development |
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