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Short‐ and Long‐term Effects of High Temperatures (47–49 °C) on Tobacco Leaves. I. Photosynthesis
Author(s) -
ZIONI ALIZA BEN,
ITAI CHANAN
Publication year - 1972
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1972.tb03603.x
Subject(s) - cationic polymerization , photosynthesis , fixation (population genetics) , chemistry , nicotiana , botany , horticulture , carbon fixation , biology , solanaceae , biochemistry , organic chemistry , gene
Detached Nicotiana rustica leaves were exposed for 2 minutes to temperatures in the range 36° to 51°C. Above 45°C, 14 CO 2 fixation was reduced by half as compared with controls. The fall in 14 CO 2 fixation continued for 2 1/2 h. Recovery was completed 45 h after the treatment. Above 45°C there was an increase in the labeled cationic and anionic fractions and a decrease in the neutral fractions, both increase and decrease being associated with the impaired CO 2 fixation. However, these changes in products were also demonstrated when leaves were exposed to the high temperature after labeling.