caa a22 4500 397520824 CHVBK 20180308164632.0 cr unu---uuuuu 161202e199509 xx s 000 0 eng 10.1093/jxb/46.special_issue.1429 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.special_issue.1429 Association of water use efficiency and nitrogen use efficiency with photosynthetic characteristics of two wheat cultivars [Elektronische Daten] [Riki van den Boogaard, Svetla Kostadinova, Erik Veneklaas, Hans Lambers] We examined if higher plant water use efficiency is related to a higher investment of nitrogen in components of the photosynthetic apparatus and if this is associated with a less efficient use of nitrogen for photosynthesis or for growth. We also assessed the influence of a reduced supply of water and nitrogen on these relationships. For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency. Differences in leaf water use efficiency (A/E) between cultivars or treatments were associated with differences in Rubisco activity or rate of electron transport and, in general, with differences in plant water use efficiency. They were not invariably related to a low photosynthetic nitrogen use efficiency (PNUE). A high A/E was associated with a low PNUE, e.g. when we compared cultivars at high irradiance. In this case, a high A/E and a high leaf nitrogen concentration were associated with a low stornatal conductance and an equal rate of photosynthesis. A high A/E was not associated with a low PNUE when differences in A/E were mainly caused by higher rates of photosynthesis associated with higher nitrogen concentrations, e.g. when we compared cultivars at low irradiance and high water and nitrogen supply. An increase in the proportion of total leaf nitrogen associated with the photosynthetic apparatus at low soil-nitrogen increased PNUE, without affecting A/E in the opposite way. We conclude that whole plant nitrogen use efficiency was low for the cultivars with a high plant water use efficiency. © 1995 Oxford University Press Environmental Interactions nationallicence Nitrogen use efficiency nationallicence water use efficiency nationallicence photosynthesis nationallicence wheat nationallicence van den Boogaard Riki Department of Plant Ecology and Evolutionary Biology, Utrecht University PO Box 80084, 3508 TB Utrecht, The Netherlands aut Kostadinova Svetla Department of Agrochemistry, Agricultural University 12 Mendeleev Street, Plovdiv, Bulgaria aut Veneklaas Erik Department of Plant Ecology and Evolutionary Biology, Utrecht University PO Box 80084, 3508 TB Utrecht, The Netherlands aut Lambers Hans Department of Plant Ecology and Evolutionary Biology, Utrecht University PO Box 80084, 3508 TB Utrecht, The Netherlands aut Journal of Experimental Botany Oxford University Press 46/special_issue(1995-09), 1429-1438 0022-0957 46:special_issue<1429 1995 46 exbotj https://doi.org/10.1093/jxb/46.special_issue.1429 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.special_issue.1429 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- van den Boogaard Riki Department of Plant Ecology and Evolutionary Biology, Utrecht University PO Box 80084, 3508 TB Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Kostadinova Svetla Department of Agrochemistry, Agricultural University 12 Mendeleev Street, Plovdiv, Bulgaria aut NATIONALLICENCE 700 1- Veneklaas Erik Department of Plant Ecology and Evolutionary Biology, Utrecht University PO Box 80084, 3508 TB Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Lambers Hans Department of Plant Ecology and Evolutionary Biology, Utrecht University PO Box 80084, 3508 TB Utrecht, The Netherlands aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/special_issue(1995-09), 1429-1438 0022-0957 46:special_issue<1429 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