Activity of PEP carboxylase and some photorespiratory enzymes in C3 and C4 plants grown at two temperatures

A comparative anatomical and biochemical analysis in salsola (Chenopodiaceae) species with and without a kranz type leaf anatomy: a possible reversion of c4 to c3 photosynthesis

“…It is known that low temperatures are associated with an increase in the level of RuBPC (Pearcy, 1977) and a suppression of C 4 metabolism occurs (P'yankov, 1984). It was observed that the RuBPC/PEPC ratio was altered in the C 4 plant Eleusine coracana grown at different altitudes, which is connected with an increased activity of RuBPC and a decreased PEPC (Pandey and Purohit, 1980). We have the same results in S. australis from different altitudes (Table 3) and believe that the main reason for this is that there is a temperature decrease associated with an increase in altitude that would favor C 3 photosynthesis.…”

Altitude-related changes in activities of carbon metabolism enzymes in Rumex nepalensis

“…This is in contrast to reported decrease in PEPC activity with altitude in C 3 plant Fagopyrum esculentum (Pandey and Purohit 1980) and Salsola australis (Pyankov et al 1997), suggesting that where it increased, it may be related to an altered carbon metabolism for optimal photosynthetic performance at high altitude. PEPC probably could play an important role in capturing environ'-mental or photorespired CO 2 at high altitude in C 3 plants .…”

“…While low temperature could stimulate RuBPCO activity in C 4 plant Atriplex (Osmond et al 1982), neither high altitude nor chilling could enhance RuBPCO capacity in C 4 plants Bouteloua gracilis and Muhlenbergia montanum Sage 2000, 2001). Increased phosphoenolpyruvate carboxylase (PEPC) activity was reported in C 3 species Glycine soja with increase in elevation from about 500 to 3 650 m, though the implication of this fact was not discussed (Pandey and Purohit 1980). Earlier, we reported ---that crop plants like barley and wheat when grown at high altitude significantly increased carboxylase and oxygenase activities of RuBPCO and activities of PEPC, aspartate aminotransferase (AspAT), and glutamine synthetase (GS) as compared to those grown at low altitude .…”