caa a22 4500 397521103 CHVBK 20180308164633.0 cr unu---uuuuu 161202e199507 xx s 000 0 eng 10.1093/jxb/46.7.759 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.7.759 Striga hermonthica decreases photosynthesis in Zea mays through effects on leaf cell structure [Elektronische Daten] [Lucy H. Smith, Alfred J. Keys, C.W.Evans Michael] Maize seedlings were grown in pots either with or without preconditioned seeds of the parasitic weed, Striga hermonthica. After between 4 and 8 weeks, net photosynthesis in the leaves of maize plants infected with Striga decreased compared to leaves of uninfected control plants. The activities of four enzymes of photosynthetic metabolism were, however, little affected by infection. A pulse-chase experiment using 14CO2 showed that C4 acids were the main early products of assimilation even when the rate of photosynthesis was much decreased by infection, but more radio-activity appeared in glycine and serine than in leaves of healthy maize plants. Leaves of infected maize required longer to reach a steady rate of photosynthesis upon enclosure in a leaf chamber than leaves of uninfected plants after similar treatment. Electron microscopy of transverse sections of the leaves of infected maize indicated that the cell walls in the bundle sheath and vascular tissue were less robust than in leaves of healthy plants. The results suggest that infection with Striga causes an increase in the permeability of cell walls in the bundle sheath, leakage of CO2 from the bundle sheath cells and decreased effectiveness of C4 photosynthesis in host leaves. © Oxford University Press Research Papers nationallicence Zea mays nationallicence Striga hermonthica nationallicence photosynthesis nationallicence photorespiration nationallicence enzyme activity nationallicence Smith Lucy H. Department of Biochemistry and Physiology IACR-Rothamsted, Harpenden, Hertfordshire AL52JQ, UK aut Keys Alfred J. Department of Biochemistry and Physiology IACR-Rothamsted, Harpenden, Hertfordshire AL52JQ, UK aut Michael C.W.Evans Department of Biology, Darwin Building, University College Gower Street, London WC1E 6BT, UK aut Journal of Experimental Botany Oxford University Press 46/7(1995-07), 759-765 0022-0957 46:7<759 1995 46 exbotj https://doi.org/10.1093/jxb/46.7.759 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.7.759 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Smith Lucy H. Department of Biochemistry and Physiology IACR-Rothamsted, Harpenden, Hertfordshire AL52JQ, UK aut NATIONALLICENCE 700 1- Keys Alfred J. Department of Biochemistry and Physiology IACR-Rothamsted, Harpenden, Hertfordshire AL52JQ, UK aut NATIONALLICENCE 700 1- Michael C.W.Evans Department of Biology, Darwin Building, University College Gower Street, London WC1E 6BT, UK aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/7(1995-07), 759-765 0022-0957 46:7<759 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford