Biochemical and Physiological Characterization of Higher Plants with Reduced Photorespiration. Progress Report, May 25, 1981-August 1, 1983

摘要

Based on work with Moricandia arvensis and Panicum milioides, it is clearly established that a C sub 4 -like CO sub 2 -concentrating system is not the only mechanism by which terrestrial higher plants have reduced photorespiration. Similarly, the lack of any significant involvement of PEP carboxylase in the fixation of either atmospheric or subatmospheric levels of CO sub 2 argues against some type of PEP carboxylase-mediated recycling of photorespiratory CO sub 2 in these species. Whether the apparent difference in glycine metabolism for M. arvensis relates directly to the reduction of photorespiration in this crucifer remains to be determined. Likewise, whether the Flaveria genus is presently evolving with respect to the pathway of photosynthetic carbon assimilation and whether a limited degree of C sub 4 photosynthesis is responsible for the lower GAMMA-values and reduced rates of photorespiration in the C sub 3 -C sub 4 intermediate Flaveria species are intriguing, but as yet unanswered questions. (ERA citation 08:049918)