Salinity increases CO2 assimilation but reduces growth in field-grown, irrigated rice

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cg.authorship.typesCGIAR and advanced research instituteen_US
cg.contributor.affiliationRoyal Veterinary and Agricultural University, Denmarken_US
cg.contributor.affiliationAfrica Rice Centeren_US
cg.contributor.affiliationUnversity of Hamburgen_US
cg.creator.identifierFolkard Asch: 0000-0001-6589-9916en_US
cg.howPublishedFormally Publisheden_US
cg.identifier.doihttps://doi.org/10.1023/a:1014953504021en_US
cg.isijournalISI Journalen_US
cg.issn1573-5036en_US
cg.issue1en_US
cg.journalPlant and Soilen_US
cg.reviewStatusPeer Reviewen_US
cg.volume218en_US
dc.contributor.authorAsch, F.en_US
dc.contributor.authorDingkuhn, M.en_US
dc.contributor.authorDorffling, K.en_US
dc.date.accessioned2021-07-14T10:26:02Zen_US
dc.date.available2021-07-14T10:26:02Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/114275en_US
dc.titleSalinity increases CO2 assimilation but reduces growth in field-grown, irrigated riceen_US
dcterms.abstractalinity is a major yield-reducing factor in coastal and arid, irrigated rice production systems. Salt tolerance is a major breeding objective. Three rice cultivars with different levels of salt tolerance were studied in the field for growth, sodium uptake, leaf chlorophyll content, specific leaf area (SLA), sodium concentration and leaf CO2 exchange rates (CER) at photosynthetic active radiation (PAR)-saturation. Plants were grown in Ndiaye, Senegal, at a research station of the West Africa Rice Development Association (WARDA), during the hot dry season (HDS) and the wet season (WS) 1994 under irrigation with fresh or saline water (flood water electrical conductivity = 3.5 mS cm-1). Relative leaf chlorophyll content (SPAD method) and root, stem, leaf blade and panicle dry weight were measured at weekly intervals throughout both seasons. Specific leaf area was measured on eight dates, and CER and leaf sodium content were measured at mid-season on the first (topmost) and second leaf. Salinity reduced yields to nearly zero and dry-matter accumulation by 90% for the susceptible cultivar in the HDS, but increased leaf chlorophyll content and CER at PAR- saturation. The increase in CER, which was also observed in the other cultivars and seasons, was explained by a combination of two hypotheses: leaf chlorophyll content was limited by the available N resources in controls, but not in salt-stressed plants; and the sodium concentrations were not high enough to cause early leaf senescence and chlorophyll degradation. The growth reductions were attributed to loss of assimilates (mechanisms unknown) that must have occurred after export from the sites of assimilation. The apparent, recurrent losses of assimilates, which were between 8% and 49% according to simulation with the crop model for potential yields in irrigated rice, ORYZA S, might be partly due to root decomposition and exudation. Possibly more importantly, energy-consuming processes, such as osmoregulation, interception of sodium and potassium from the transpiration stream in leaf sheaths and their subsequent storage, drained the assimilate supply.en_US
dcterms.accessRightsLimited Accessen_US
dcterms.audienceScientistsen_US
dcterms.bibliographicCitationAsch F., Dingkuhn M., Dorffling K.Salinity increases CO2 assimilation but reduces growth in field-grown, irrigated rice.Plant and Soil.2000, Volume 218, Issue 1: 1-10.en_US
dcterms.extent1-10en_US
dcterms.issued2000en_US
dcterms.languageenen_US
dcterms.licenseOtheren_US
dcterms.publisherSpringeren_US
dcterms.subjectriceen_US
dcterms.subjectresearchen_US
dcterms.subjectirrigated riceen_US
dcterms.typeJournal Articleen_US

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