EFFET DE L’ENDURCISSEMENT A LA GELEE SUR LA TENEUR EN MATIERE SECHE, EN PHOSPHORE LIPIDIQUE ET EN PROTEINES SOLUBLES ET INSOLUBLES DU BLE D’HIVER

Abstract

During frost hardening of winter wheat (Triticum aestivum cvs. Kharkov 22 M.C., hardy, and Champlein, less hardy) fresh and dry weights, lipid phosphorus and soluble and insoluble proteins were determined. Percentage dry matter of the tissues doubled in both cultivars. When results are expressed per plant and per gram fresh weight, lipid phosphorus and soluble and insoluble proteins increased, while they decreased on a dry weight basis. There was therefore apparently no enrichment of the tissues in membranes in comparison with the other cell components but rather a general increase in dry weight. The observed changes occurred to the same extent in both cultivars and thus cannot explain varietal differences in frost hardiness. There was little correlation between the changes in lipids and protein. Lipid and protein membrane components appear therefore to have changed independently.