1971 Volume 37 Issue 7 Pages 654-670
Porphyra tenera and P. yezoensis were cultured in many culture sea waters of various chemical compositions and 14 inorganic and organic compounds of the lavers were analyzed.
The correlation between chemical compositions of lavers and compounds of the culture sea waters have been discussed.
1) The quantity of Mn, P and total nitrogen in lavers showed great variations according to their contents in the culture sea waters. The concentration of Mn, P and nitrogen in the culture sea waters was sufficient at Mn: 0.066, P: 1.02, and nitrogen: 9.3mg/l to obtain maximum contents of the respective components. On the other hand, influences on K, Mg, Ca, Fe and S were insignificant.
2) Carbohydrate was classified into three groups, namely, readily acid-soluble sugar, acid-insoluble, alkali-soluble sugar and highly acid-, alkali-resistant sugar. It was recognized that the sum of the sugars and crude protein is nearly constant.
3) The contents of P and acid-insoluble, alkali-soluble sugar in lavers cultured in the early season were higher than in the late season.
4) When physiologically injured lavers were cultured, contents of K, Mn, P and total nitrogen were low while Mg and carbohydrate were high.
5) Interactions and influence of specific gravity of the culture sea water were extremely minimal.
