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Titre : Temperature and salt tolerance as factors of Euphorbia lathyris germination

Auteur : Luna Platas, Sergio

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1981

Résumé
Seeds of gopherweed (Euphorbia lathyris) were tested under laboratory conditions at The University of Arizona, Tucson in 1980. The initial experiment was the determination of the optimum temperature for germination. Germination counts and respiration rate measurements were made on a daily basis through the sixth day after sowing. A seed was considered germinated When the radicle attained a length of 3 mm. The optimum temperature range for germination occurs between 23 and 25 C. Above and below this range, germination is significantly reduced. Germination closely followed the respiration rates measured. Salinity and drought tolerance were measured by testing the ability of Euphorbia lathyris seeds to germinate in osmotically active media. The per cent germination decreased with increased solute concentration following the trend of respiration, in addition the increased salinity levels delayed germination. The types of salts used did not differentially affect seed germination.

Mots clés : Plants — Effect of temperature on. ; Plants — Effect of salts on. ; Euphorbia. ; Germination.

Présentation

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