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- W2081330681 abstract "1. Two harvests (2 months apart) were made of eleven varieties of carrots planted in August and in March. The carrots were of prime quality when harvested. The peeled portions were assayed for catalase, peroxidase, ascorbic-acid oxidase, and (in the case of those planted in March) also for phosphatase. 2. The activities per gram of peeled tissue were about the same as for the whole carrot root, except for peroxidase, which in the samples tested was concentrated in the peel. With the exception of peroxidase, which varied little in average activity for the eleven varieties, the highest activities were found for carrots harvested in July, followed in order by those harvested in September, March, and January. The highest average enzyme activities were thus obtained under the most favorable growing conditions of temperature and photoperiod. The differences in average enzyme activity appeared to reflect differences in the growing condition rather than in the age of the carrots (within the limits of the physiological age studied). 3. Within a single harvest the differences in enzyme content (that is, differences attributable to variety) ranged from 1.2-fold for phosphatase to 3.3-fold for ascorbic-acid oxidase, and averaged about twofold for the four enzymes studied. The ratios of the average enzyme contents for the July (best growing condition) and the January (poorest growing condition) harvests were 1.3 for peroxidase, 1.7 for catalase, and 5.5 for ascorbic-acid oxidase." @default.
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- W2081330681 date "1946-03-01" @default.
- W2081330681 modified "2023-10-09" @default.
- W2081330681 title "Seasonal Variation in the Enzyme Content of Eleven Varieties of Carrots" @default.
- W2081330681 doi "https://doi.org/10.1086/335359" @default.
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