Studies on the refractive indices of expressed juice in wheat seedlings
1936
Ebiko, K.
The studies described in this paper were undertaken to find the refractive indices of expressed juice as one of the physico-chemical characters of wheat seedlings. The results obtained may be summarized as follows: 1. With respect to the relation between the refractive index and the winter and spring growing habit, the refractive indices of the winter varieties were greater than those of the spring varieties, on an average, when they are exposed to low temperature conditions before measurement. 2. In comparison between the three different temperature cultures, the lower the temperature the greater was the refractive index, thus indicating that the refractive indices of expressed juice are greatly affected by environmental factors. 3. With regard to the relationship between the refractive index and winter hardiness, the hardy varieties had greater refractive indices in general than the nonhardy varieties under hardened conditions. 4. Greater refractive indices were always observed in the juice from unfrozen plants as compared with that from frozen plants. 5. Within the limits of the present varietal investigations, an accurate correlation was not observed between the content of total solids in expressed juice estimated by the refractometer and the mono-saccharide content in seedling tissues obtained by chemical analysis.
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