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Shift in the photosynthetic carboxylation pattern by iron chlorosis in sugarcane leaves

, : Shift in the photosynthetic carboxylation pattern by iron chlorosis in sugarcane leaves. Photosynthetica (Prague) 19(4): 561-565

Iron chlorotic leaves of sugarcane cv. Co 740 with increasing degree of chlorosis, distinguishable by eye as medium green, medium yellow and completely yellow, were investigated for their anatomical peculiarity and photosynthetic carboxylation mechanism. Light microscopic study exhibited restricted chloroplast differentiation in mesophyll and bundle sheath cells compared to that of green ones. Photosynthetic carbon fixation rate by isolated mesophyll protoplasts and bundle sheath strands was reduced due to iron chlorosis. Short term 14CO2 labelling experiment showed that first formed photosynthate was aspartate in the chlorotic leaves as against malate in green leaves. The activities of phosphoenolpyruvate carboxylase and NADP-malic dehydrogenase were reduced by more than 93%, while ribulose-1,5-bisphosphate carboxylase and NADP-malic enzyme (NADP-ME) by 33 and 18%, respectively, in iron chlorotic leaves. Increased activity of NAD-malic enzyme in chlorotic leaves supported the massive label found in aspartate. Chlorosis also resulted in stimulation of transaminase activity. Labelling in aspartate as initial product of photosynthesis in chlorotic leaves does not come as a life-saving device, since sugarcane does not possess aspartate decarboxylating machinery.


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