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Accueil du site → Master → Etats Unis → 1965 → Factors affecting the germination of safflower seed (Carthamus tinctorius L.)

University of Arizona (1965)

Factors affecting the germination of safflower seed (Carthamus tinctorius L.)

Bantayehu, Gelan

Titre : Factors affecting the germination of safflower seed (Carthamus tinctorius L.)

Auteur : Bantayehu, Gelan

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1965

Résumé
The influence of several factors on the germination of four lines of safflower, Gila, AlOlt, A12117, and A101, was studied at Tucson, Arizona, in 196Ue There was no dormancy in freshly harvested safflower seeds0 The germination percentages obtained were about the same when seeds were tested one day or sixty days after harveste A temperature of 15° 0 was nearly optimum for the germination of safflower seed, although there was but little difference between 1$° 20° and 25° C, The minimum temperature at which gemination would occur was somewhat lower than 5° C and the maximum somewhat above ^0° Ce Germination was the most rapid at 30° C, but the highest percentage of germination and a very rapid rate of germination coincided at 25° C6 The rate of germination of safflower seed followed, in general, the principle of Van’t Hoff’s law for chemical action0 Moisture applied to dry, mature seeds to simulate rain damage reduced seed vitality® The re suits’" indicate, however, that if seeds are dried soon after being wet, germination percentages of 80 percent or above may still be obtained® Mechanical damage, not visible externally, inflicted during the harvest of safflower seeds reduced both laboratory germination and field emergence by almost 20 percent® Hence, combine adjustments, especially the cylinder speed are of great importance® Laboratory germination percentages averaged higher than those obtained in the corresponding field emergence tests0 The normal hull lines Gila and AlOlt gave consistently higher germination than the striped hull lines AI2I4I7 and A101o

Mots clés : Safflower — Preharvest sprouting. ; Seeds — Viability.

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