scholarly journals Physiological and morphological studies on potato plants : Part 12. On the variation of the ascorbic acid content in potato leaves during the growing period, with special reference to the formation of the potato tubers

1953 ◽  
Vol 22 (1-2) ◽  
pp. 113-114
Author(s):  
Takashi TAGAWA ◽  
Yozo OKAZAWA
Keyword(s):  
Ascorbic Acid ◽  
Special Reference ◽  
Acid Content ◽  
Ascorbic Acid Content ◽  
Potato Tubers ◽  
Growing Period ◽  
Potato Plants ◽  
Morphological Studies

scholarly journals Variation in the B-Carotene and Ascorbic Acid Contents of Lettuce and Carrots as Influenced by Seasonal Changes in Puerto Rico

1969 ◽  
Vol 48 (1) ◽  
pp. 39-48
Author(s):  
María del C. C. Fernández
Keyword(s):  
Ascorbic Acid ◽  
Puerto Rico ◽  
Solar Radiation ◽  
Acid Content ◽  
Climatic Factors ◽  
Ascorbic Acid Content ◽  
Acid Synthesis ◽  
Growing Period ◽  
Ascorbic Acid Synthesis ◽  
Rainy Days

1. Climatic factors such as temperature, number of rainy days, and total rainfall, apparently have no effect on the synthesis of ß-carotene and ascorbic acid in lettuce and carrots, when these are determined during the entire growing period. 2. The ascorbic acid content of lettuce is inversely correlated with the sunlight received by the plant some 10 days prior to harvest. 3. Solar radiation received by lettuce plants during October, January, and February seems to be more favorable to the ß-carotene synthesis than that received during the rest of the year. Days are longer, but solar radiation is milder during this time of the year. 4. Solar radiation in Puerto Rico favors ascorbic acid synthesis in lettuce all year through. 5. Results obtained under the conditions of these studies demonstrate that temperature, number of rainy days, and rainfall have no effect on the ß-carotene and ascorbic acid content of carrots.

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