caa a22 4500 397522622 CHVBK 20180308164637.0 cr unu---uuuuu 161202e199501 xx s 000 0 eng 10.1093/jxb/46.1.73 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.1.73 Partitioning and redistribution of sulphur during S-stress in Macroptilium atropurpureum cv. Siratro [Elektronische Daten] [Christopher I. Bell, David T. Clarkson, W. John Cram] During the first 7 d of sulphate-deprivation stored SO42- was redistributed and assimilated into organic forms in the tropical legume Macroptilium atropurpu-reum cv. Siratro. However, whilst the sulphate content of all tissues declined after removing the external SO42- supply this was slowest in mature leaves. By contrast, the total S content of mature leaves declined markedly in the absence of external sulphate whilst that of both young leaves and roots increased. Furthermore, when radiolabelled SO42- was applied to abraded surfaces of mature leaves, most of the translocated label was recovered in the root following 2 d SO42- deprivation. By contrast, radiolabelled SO42-applied to young leaves was mostly retained in these tissues and not translocated. Within 3 d of removing the SO42- supply there was a large increase in extractable APS-sulphotransferase activity in roots accompanied by a decline in nitrate reductase activity, but these effects were not seen in leaves. Five days after the removal of SO42- there was a large increase in the content of asparagine in roots. The results are discussed in relation to the co-ordination of NO3- and SO42- uptake and assimilation and the partitioning of sulphur during S-stress. © Oxford University Press Research Papers nationallicence Sulphate supply nationallicence stomatal conductance nationallicence ATP-sulphurylase nationallicence APS-sulphotransferase nationallicence nitrate reductase nationallicence Bell Christopher I. Department of Biology, The University Newcastle upon Tyne NE1 7RU, UK aut Clarkson David T. Department of Agricultural Sciences, University of Bristol, BBSRC Institute of Arable Crops Research, Long Ashton Research Station Bristol BS189AF, UK aut John Cram W. Department of Biology, The University Newcastle upon Tyne NE1 7RU, UK aut Journal of Experimental Botany Oxford University Press 46/1(1995-01), 73-81 0022-0957 46:1<73 1995 46 exbotj https://doi.org/10.1093/jxb/46.1.73 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.1.73 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bell Christopher I. Department of Biology, The University Newcastle upon Tyne NE1 7RU, UK aut NATIONALLICENCE 700 1- Clarkson David T. Department of Agricultural Sciences, University of Bristol, BBSRC Institute of Arable Crops Research, Long Ashton Research Station Bristol BS189AF, UK aut NATIONALLICENCE 700 1- John Cram W. Department of Biology, The University Newcastle upon Tyne NE1 7RU, UK aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/1(1995-01), 73-81 0022-0957 46:1<73 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