context: The first mention of sugarcane as the first product of photosynthesis may be dicarboxylic tetracarbonic acid appeared in 1954 as a short note without reference and was published in the annual report of the experimental station of the Hawaiian Sugar Plantation Association. In more detail, this work appeared in the form of a short message by H.P. Korchak, K.E. Hartt, and G. O. Burr. A full-fledged article by this group of researchers was published only in 1965 [2]. Such a large delay is explained by the discrepancy between the results obtained and the data obtained in the laboratory of Melvin Calvin, with whom the Hawaiian group had close contact at that time [3].
question: When was the Hatch-Slack cycle opened?
answers.text: 1954