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Accueil du site → Doctorat → Royaume-Uni → 1996 → Storage and viability of forest tree seeds in the Libyan climate

University of Salford (1996)

Storage and viability of forest tree seeds in the Libyan climate

Betelmal, A.G.B

Titre : Storage and viability of forest tree seeds in the Libyan climate

Auteur : Betelmal, A.G.B

Université de soutenance : University of Salford

Grade : Doctor of Philosophy (PhD) 1996

The aim of this work was to study the effects of the Libyan climate on the viability in storage of three imported tree species used in the Libyan afforestation programme, namely ; Robinia pseudoacacia L, Eucalyptus globulus, Labill, and Pinus pinea L. Seeds are imported into Libya and stored for varying periods before use. Also, as the new plantations come into bearing, it will be important to have information on the effects of the local climate on both the natural re-seeding capabilities of these species in the field, and on seeds harvested and stored within the country.A range of tests established the quality of each seed lot before experimental treatments. The seed lots were then kept in cold storage 5oC, and also sealed into containers maintaining a range of artificial climatic conditions, simulating the mean conditions obtaining in the Libyan afforested areas of study between maturation and sowing. The effects of these conditions on their viability and vigour were then examined.The moisture content of each sample became adjusted to equilibrium with the conditions in which it was stored. Germination potentials and vigour were affected both by increase in the time of storage, and by the relative humidity and temperature. Viability determined by the tetrazolium test confirmed the results of the germination tests.The range of tests also included growth rates, seedling growth and numbers of abnormalities, seedling fresh and dried weights, electrical conductivity of seed leachates, accelerated ageing, micro-organisms associated with seed storage, and chromosome aberrations. Experiments were also carried out to determine factors controlling germination of the species, including the separation of the Robinia into hard and soft seed fractions for separate testing.

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