Photosynthetic Response of Soybeans with Genetically Altered Chlorophyll
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Citation:The Ohio Journal of Science. v78, n5 (September, 1978), 267-271
The photosynthetic response of soybean plants (Glycine max (L.) Merr. Strain T219) at the start of a photoperiod showed that both normally pigmented plants (dark green) and chlorophyll-deficient plants (light green) had an induction period averaging 6 min, before a net CO2 uptake could be measured. The induction period was followed by a rapid increase in photosynthesis until a maximum rate was reached after 15 min and then gradually declined. Both chlorophyll content and ribulose diphosphate carboxylase activity were greatest in dark green plants. Plants tested at mid-day exhibited the highest carboxylase activity and plants assayed at mid-night the lowest activity. During the first 5 min of illumination (following a 12 hr dark period) the carboxylase activity increased 1.5 times in dark green and 1.9 times in light green plants. This indicated that initiation of the photoperiod enhanced ribulose diphosphate carboxylase activity.
Author Institution: Department of Biological Sciences, Bowling Green State University
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